GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
GLAST Large Area Telescope:
Integration and Test
WBS: 4.1.9
Elliott Bloom
SU-SLAC
Integration and Test Manager
elliott@slac.stanford.edu
Document: LAT-PR-01967
Section 14 Integration and Test
1
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Outline
•
•
•
•
•
•
•
•
•
•
•
Overview
I&T Flow
Electrical Ground Support Equipment
Mechanical Ground Support Equipment
Integration, Facilities, Configuration, and Test
LAT Support to Observatory- Supplemental slide section.
Particle Test
Science Verification, Analysis, and Calibration
Cost and Schedule
Risks and Summary
Supplemental Slides
Document: LAT-PR-01967
Section 14 Integration and Test
2
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Overview
Section 14-1
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
3
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Integration and Test Responsibilities
• I & T “subsystem” is focal point of LAT integration, test and
calibration activities.
– I & T team plans, manages and execute activities.
– ACD, ELX, CAL, Mechanical Systems, SAS, and TKR subsystem
teams and other Collaboration members provide LAT
hardware/software that is tested, integrated and then tested and
calibrated by I&T.
– The subsystems and other collaboration members also support
Integration & Test & Calibration of the Calibration Unit and full LAT.
– I & T Subsystem activities for entire mission.
 LAT integration planning and management.
 Mechanical and electrical integration.
 MGSE and EGSE development.
Fabrication  Plan environmental test procedures and execute.
Phase
 Plan particle tests and execute.
 Particle beam and test equipment development.
 Ground verification and calibration of LAT.
 Ground science verification of LAT.
 Support activities at Spacecraft Vendor and launch facility.
 Commissioning of LAT in orbit -- deliver a working and calibrated
instrument to IOC.
Document: LAT-PR-01967
Section 14 Integration and Test
4
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Functional Performance (SE and I&T)
LATInstrumentPerformance
Verification Plan
LAT-M D-00408
T. Leisgang
SubsystemTest
Plans
Tracker Tower Test
Plan
LAT-TD-00155
LAT
Performance &
Operation Test
Plans
Com ponent
Aliveness Tests
Subsystem
IntegrationTests
ACD Test Plan
LATLim ited
Perform ance
Tests
ACD-PLAN-000050
LAT
Com prehensive
Perform ance
Tests
LATOperational
Perform ance Tests
ElectronicsTest
Plan
LAT-TD-00296
SUI
TEM
EP
PDU
GASU
E. Gawehn
E-GSE
LAT-M D-01533
M .Huffer
R. Claus
L. Wai
LAT Handling
&Transportation Plan
LAT-M D-00452
D-00649
LAT Contamination Control
LAT-M D-00404
Plan
J. Cullinan
E. Gawehn
M -GSE
LAT-M D-01462
LAT Instrumentation Plan
LAT-M D-00890
M .Lovellette
W. Davis
Facilities
LAT-M D-01386
LAT Survey & Alignment
L. Wai
LAT-M D-01586
LAT Survey Plan
LAT-TD-00895
L. Wai
M .Nordby
M echanical Weight & CG
LAT-M D-01598
E. Gawehn
L. Wai
Dynamics Tests
LAT-M D-01836
E. Gawehn
M .Lovellette
M echanicalS/S
Test Plan
LAT-SS-00493
LAT Flight Software
Test Plan
LAT-TD-00786
LATM echanicalIntegration
LAT-PS-00676
E. Gawehn
L. Wai
Calorimeter Test
Plan
LAT-SS-00262
Thermal S/S Test
Plan
No Number
LAT Integration & Test Plan
LAT-M D-01376
E. Bloom
LAT Dynamics Test Plan
LAT-M D-01196
Y Ismael
M .Lovellette
• Electrical Functional
Tests
• Structural and
Mechanical Tests
• EMC/EMI Tests
• Thermal Verification
Tests
• Visual Inspection
• Instrument Monitoring
• End-to-end test (at ~
35,000 ft in a jet airplane
during transport to NRL
for environmental tests)
(TBR)
ElectricalPerformance Tests
LAT-M D-01055
L. Wai
ThermalTests
LAT-M D-01837
M .Lovellette
E. Gawehn
LAT Thermal Test Plan
LAT-M D-01600
M .Lovellette
J. Wang
LAT EM I Tests
LAT-M D-01838
LAT EM I/EM C Test Plan
No Number
M .Lovellette
T. Leisgang
M .Lovellette
LAT SVAC Test Plan
LAT-M D-01587
E. do Couto E Silva
Particle Test Plan
LAT-M D-00440
G.Godfrey
Document: LAT-PR-01967
SVAC Plan
LAT-M D-00446
E. Do Couto E Silva
S. Ritz
Produce a
Working
Instrument
Section 14 Integration and Test
5
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Science Performance (SE, IS, and I&T )
LATPerformance Specification
(LevelIIb)
LAT-MD-00010
ACD Subsystem Spec.
Tracker SubsystemSpec
(levelIII)
CAL Subsystem Spec.
(levelIII)
LAT-MD-00016
LAT-MD-00017
LAT-MD-0018
(levelIII)
SVAC Plan
• Particle tests (beam test, cosmic
rays, Van de Graaff)
• Calibration (charge injection,beam
test, cosmic rays)
• Science verification tests (beam
test, cosmic rays, Van de Graaff)
LAT-MD-00446
(levelIII)
E. do Couto e Silva
Particle Test Plan
LAT-MD-00440
(levelIV)
G.Godfrey
S. Ritz
LAT SVAC Test Plan
LAT-MD-01587
(levelIV)
E. do Couto e Silva
Engineering Model
Calibration Unit
LATIntegration
LAT-MD-00573
(levelIV)
LAT-MD-00574
(levelIV)
LAT-MD-0575
(levelIV)
E. do Couto e Silva
E. do Couto e Silva
E. do Couto e Silva
Document: LAT-PR-01967
LATEnvironmental
Tests
LAT-MD-00576
(levelIV)
E. do Couto e Silva
LAT Mission
Integration
LAT-MD-00577
(levelIV)
LAT Phase 0 OnOrbit
LAT-MD-0581
(levelIV)
E. do Couto e Silva
E. do Couto e Silva
Produce a
Scientifically
Working
Instrument
Section 14 Integration and Test
6
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
MGSE Drawing Tree/Status
Manufactured
Design Complete
Design Phase
MGSE Development Plan
LAT-MD-01462
EM Lifting Fixture
EM
EM ACD Scintillator
Support Fixture
EM
Van de Graaff Support
Stand
EM CU
FU
Calibration Unit X, Y, θ
Movement System
CU
EM
Calorimeter Lift Fixture
EM CU
FU
Calibration Unit Lift
Fixture
CU
Calibration Unit ACD
Support Fixture
CU
FU
Vibration Test Fixture
FU
Document: LAT-PR-01967
FU
Special Crane
Attachment to GPR
FU
Thermal Vacuum
Support Kit
FU
EM-Cal Rotation /
Support Stand
EM CU
Calorimeter Alignment
Tool
EM CU
FU
CU to Rotation Stand
Interface Plates
CU
Thermal Control Tent
for Beam Test
CU
Grid Perimeter Ring
EM Single Bay
EM ENGINEERING MODEL SUPPORT
CU CALIBRATION UNIT SUPPORT
FU FLIGHT UNIT SUPPORT
EM CU
Staging Tables
EM CU
FU
Calibration Unit
Transport Box
CU
Thermal Control Cart
Ducting, Cold plates
CU
CU Integration Stand
Proof Test Article
FU
LAT Shipping Container
FU
Acoustic Test SC
Simulator
FU
Weight and CG Table
CU
ACD Integration
Frame
FU
Roll Over Stand
FU
Roll Over Stand
Proof Test Article
FU
ACD Lift Fixture
FU
ACD Lift Fixture Proof
Test Article
FU
Section 14 Integration and Test
FU
7
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFA Response
I&T had 21 RFAs from CDR peer review. All were answered. A sample of
those that impacted I&T most are shown in the following pages.
ID #
2
4
Status
Closed
Closed
RFA Description
RFA Response/Closure Plan
REQUEST: Will MGSE be compatible with
S/C for integration of LAT with S/C?
REASON: I had heard in previous
conversations that there might be
interferences with the S/C that might affect
the LAT MGSE.
I&T is planning to have MGSE available at
Spectrum Astro for observatory
integration. This MGSE will allow us to
place the LAT on the S/C without
interferences. The S/C-LAT IDC should
ensure that such interferences will not
occur.
REQUEST: General concern about
coordination of subsystem design with I&T
requests, e.g.: Need for breakouts [boxes]
Keyed connections
Length/interchangeability with cables Wire
gage/physical strength Protection of
equipment during I&T REASON:
Concerned that subsystem design reflects
special needs of I&T.
I&T is coordinating with Electronics on
these issues. There will be break out
boxes and extender cables. According to
electronics, given the design of the
connectors they cannot be keyed. We will
use labels and procedures to insure
correct mating. In addition, connectors
with differing functionality have different
form factors. The gage/physical strength of
the cable are considered adequate for the
LAT application. All multistrand cables will
be sheathed. I&T will protect equipment
during installation.
Document: LAT-PR-01967
Section 14 Integration and Test
8
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFA Response
ID #
10
Status
Submitted
RFA Description
RFA Response/Closure Plan
REQUEST: What timeframe is the Beam
used for testing available? I&T
presentation stated that beam was off
during the summer. What test mitigation
is planned? REASON: With a tight
schedule, any slips in hardware fab and
component delivery to SLAC can affect
I&T schedule. If beam testing needs to be
done in June to August timeframe
(instead of April/May) what is impact on
mitigation?
The beam supplied for the LAT beam test
by SLAC is an off project cost. The project
has been told by SLAC’s Associate
Director for Research that the beam will
be available for the LAT beam test as
required. If we need to use the beam in
the summer, SLAC will incur additional offproject expenses as compared to the
currently scheduled beam test time. NB: It
is not formally an I&T responsibility to
guarantee that the beam is available as
promised by SLAC. This is a negotiation
between the LAT project office and SLAC.
Document: LAT-PR-01967
Section 14 Integration and Test
9
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFA Response
ID #
13
Status
Submitted
RFA Description
RFA Response/Closure Plan
REQUEST: By the LAT CDR, SLAC should
be prepared to address their
needs/expectations/plans during
observatory I&T. This should include
“expected” compatibility of EGSE, MGSE,
LAT testing plans, facility requirements
(cont. cont.environment). REASON: I think
this is extremely important for a successful
CDR
• Many of these issues were addressed in
a special section in our peer review. With
our current knowledge of the Observatory
integration plan we cannot proceed much
further.
• I&T has been working with the S/C
vender in the observatory I&T group to
coordinate issues.
• The S/C – LAT ICD is addressing many
of these issues, and is held by SE and
the Project Manager.
Document: LAT-PR-01967
Section 14 Integration and Test
10
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFA Response
ID #
15
18
Status
RFA Description
Submitted
REQUEST: Suggest that all non flight
hardware/software be the responsibility of I&T
and that all technicians and support
personnel for I&T activities be hired by I&T.
Responsibility includes holding budget and
personnel as well as cost and schedule
performance. REASON: Integration and test
needs to have increased authority over their
schedule performance and hardware/software
required for I&T. Org chart shows that
mechanical techs but not electronic techs are
within I&T organization. Miscellaneous non
flight hardware seems to be the responsibility
of other organizations.
The LAT IPO has decided that the current
organization will work. To mitigate against
misunderstandings between Electronics
and I&T concerning allocation of
manpower, I&T will produce a detailed
Integration and Test Staffing plan well
before the IRR. This plan will include the
day-to-day labor hours expected from the
integrators under the budgetary control of
the Electronics Subsystem.
The Instrument Scientist is working with
I&T to develop the plan.
Submitted
REQUEST: There should be a scheme to
calibrate the absolute efficiency of L1T of the
entire LAT. One easy way of doing this is to
have a muon telescope exterior to LAT and
compare its counting rate with that of LAT.
Please show the plan. REASON: There will
be no way to calibrate the absolute trigger
efficiency once in orbit.
Document: LAT-PR-01967
RFA Response/Closure Plan
Section 14 Integration and Test
11
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFA Response
ID #
21
RFA Description
Status
Closed
RFA Response/Closure Plan
REQUEST: Need to better describe “loads”
during tilt/turnover operations. Is there a point
of instability at top of turnover? What are
lateral constraints on fixture to prevent
movement/slipping? REASON: When
crane/lift point are in line, configuration is
very unstable
Document: LAT-PR-01967
The tilt over stand concept has been
replaced with a roll over stand which has
continuous control of the LAT during
movement. No crane operations are
required for rotation. This design has
been under development since the
Engineering meeting on 3/11/03 during
which we discussed LAT assembly.
Section 14 Integration and Test
12
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
CDR I&T Status Summary
•
•
•
•
•
•
Final Design Established With Known Closure Plans For Design
Trades
– 94/225 Drawings Released, 40/225 Drawings Draft – ECD 8/15/03
– EM Model Tests - ECD: 9/1/03
Internal & External Interfaces Established
– ICDs closed: LAT-TKR, LAT-CAL
– ICDs Pending: LAT-ACD
– EGSE
– MGSE
– ATDP
Performance Analyses Show Compliance Including Sufficient Design
Margin
Qualification & Verification Plans In Place
Subsystem Risk Areas Identified And Mitigation Plans Established
Cost & Schedule Manageable
– +0.7% Cost Variance and –0.9% Schedule Variance
– 3 Months Schedule Float to LAT Delivery Milestone
Document: LAT-PR-01967
Section 14 Integration and Test
13
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
I&T Flow
Section 14-2
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
14
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT I&T, Verification, and Calibration Flow
TKR: QU FS
from TKR fab
TKR: F1-2 from
TKR fab
CAL: QU- FS
from CAL fab
CAL: F1-2 from
CAL fab
ELX: EM2 Elect.
Modules
LAT I&T Prep
I&T: 4 towers +
EM ELX
Acc, Survey, Cal
LAT I&T Prep
Flight unit/spares I&T
CAL: F3-16 from
CAL fab
ELX: Flt Elec.
Mod. to LAT I&T
Acc
QU
EM
TM
CU
FU
Cal
FS
Acceptance test level
Qualification Unit
Engineering Model
Thermal model
Calibration Unit
Flight Unit
Calibration
Flight Spare
TKR/CAL: F1,2
from prep assembly
Mech: Flt Grid
from Mech
TKR: F3-16 from
TKR fab
Vibe sine sweep, sine burst
Ac Acoustic
T-B Thermal Balance in vacuum
T-V Thermal-vacuum cycle test
EMI Electro-magnetic interference test
Flight LAT - FU
I&T: LAT Tower
Assembly, Test
Acc, Survey Cal
I&T
Responsibility
I&T: LAT Debug, Test,
Ship to NRL
Acc, Survey, Cal,
End-to-End (on airplane)
ELX: GASU,
PDU, SIU, EPU
ACD: ACD to
LAT I&T
Mech: X-LAT Plate,
Thermal Switch Boxes
I&T: LAT Environmental
Tests Acc, Cal, Survey,
EMI, Vibe, Ac, T-B, T-V
Deliver to
Spectrum
Astro
CU - SLAC
Beam Test
Mech: Fit Check
Components
Document: LAT-PR-01967
Section 14 Integration and Test
15
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Assembly, Integration, and Test Flow
LAT
Integration
Environmental Tests
6/15/04
TKR
CAL
Grid
Integrate
TKR/CAL &
TEM's with
Grid
E
A
TEM/PS
EPU
O
2/28/05
F
11/18/04
C
C
Survey
E
10/13/04
F
10/14/04
Integrate
A E-Boxes
w/ Grid
3/12/05
EMI/EMC
M Survey (2)
SIU
4/06/05
L Sine Vibe
Sine Burst
Weight
PDU
GASU
O Survey
Htr Switch Box
Integrate
EMI Skirt, Htr
F
switch boxes
E
EMI Shield
Observatory
Integration
LAT Test
Modal
survey
Thermal Vacuum
Tower
Integration
4/21/05
L Balance
C
Cycling
C M
L
M
C
Survey
5/22/05
C
LAT
Integration
L
O
C
Thermal
Vac
L C M
Remove
Radiators
4/12/05
9/03/05
Install
Radiators
Weight & CG
C
O M Survey
02/14/05
4/15/05
L Acoustic
10/27/04
ACD
Integrate ACD
E
F
X-LAT Plate
E
Integrate
X LAT Plate
O
Ship to
NRL
C
L
Final
C
5/27/05
Ship to
SLAC
C
6/01/05
F
M Survey
Store
LAT
Survey
L
@NRL
Mechanical
Fit-Checks
Ship
to SA
9/01/05
@ Spectrum
Astro
Radiators
E
Electrical
InterfaceTests
A
Aliveness
Tests
Survey:
Document: LAT-PR-01967
Functional
Tests
F
O
Optical
L
M
Muon
Limited
Performance
C
Comprehensive
Performance
v3 CDR 4/21/03
Section 14 Integration and Test
16
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
EGSE
Section 14-3
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
17
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Single Tower EGSE Configuration
Online
Workstation
Subsystem
(or simulator)
CPU
• Commanding
• Telemetry
• Monitoring
AEM/TEM
• Hardware Drivers
LAT-COMM
DC Power
•External Trigger
• Test Exec
• Configuration
• Commanding
• Telemetry
• Event Processing
• Monitoring
• Visualization
• Data base
• Message logger
• Alerts
• Electronic log
Main Dataflow
Ethernet
Central
Database
WAN
Back door
debug RS-232
Ethernet
Ethernet Router
and Firewall
VME Chassis
External Hardware
Subsystem/simulator
Document: LAT-PR-01967
Electronics/Online
Section 14 Integration and Test
18
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Single Tower EGSE
Power-PC
Processor
Flight
Software
28-V Power Supply
•
•
•
•
•
•
•
•
Processor: Motorola Power-PC
Flight Software
PMCIA LAT Communication Board for
– LAT Communication
Transition Board
– Trigger
TEM DAQ Assembly
TEM Power-Supply Assembly
28-V Supply
LAT-TD-00861
Document: LAT-PR-01967
LCB: LAT
Communication
Module
Transition-card:
Trigger Module
TEM DAQ
Assembly
Tower Power
Supply
Assembly
(1.5V/2.5V/3.3V/
0-100V/0-150V)
Section 14 Integration and Test
19
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Multi-Tower EGSE
EGSE Crate
ACD
or
Sensor
Simulator
CPU
GASU
WAN
LCB
28 V Supply
VME
AEM
Central
Database
EBM
TEMs
Firewall
GEM
Online
Workstation
CAL, TKR
or
Sensor
Simulator
T&DF System (LAT)
Document: LAT-PR-01967
SLAC
EGSE
Section 14 Integration and Test
20
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT I&T Prep
EGSE Crate
ACD
or
Sensor
Simulator
CPU
GASU
WAN
LCB
28 V Supply
VME
AEM
Central
Database
EBM
Firewall
GEM
Online
Workstation
TEMs
External Data
CAL, TKR
or
Sensor
Simulator
T&DF System (LAT)
CPU
LAT-COMM
External
Hardware
SLAC
EGSE
VME
Document: LAT-PR-01967
Section 14 Integration and Test
21
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
ACD
or
Sensor
Simulator
GASU
SIU
Spacecraft
simulator
CPU
Discretes
1553
1553
LCB
28 V Supply
Central
Database
SSR
AEM
EBM
GEM
3 EPUs
TEMs
Test Point on
LAT EMI Skirt
LAT
Document: LAT-PR-01967
Firewall
CPU
LCB
CAL, TKR
or
Sensor
Simulator
WAN
LAT Assembly Configuration
Online
Workstation
EGSE Crate
CPU
LCB
SLAC
EGSE
Section 14 Integration and Test
22
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
ACD
GASU
SIU
Spacecraft
simulator
CPU
Discretes
1553
1553
LCB
28 V Supply
AEM
WAN
Complete Flight Unit Configuration (& CU)
Central
Database
SSR
EBM
GEM
3 EPUs
LCB
TEMs
Test Point on
LAT EMI Skirt
CAL, TKR
Firewall
CPU
Online
Workstation
EGSE Crate
CPU
LCB
LAT
Document: LAT-PR-01967
SLAC
EGSE
Section 14 Integration and Test
23
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Flight Unit On-Orbit Configuration
ACD
GASU
CPU
Discretes
1553
1553
LCB
28 V Supply
WAN
SIU
Spacecraft
Central
Database
SSR
AEM
GEM
3 EPUs
Firewall
EBM
CPU
LCB
TEMs
CAL
and
TKR
Test Point on
LAT EMI Skirt
IOC
Workstation
(Flight cover
installed Green Tag
item)
LAT
Document: LAT-PR-01967
MOC
Section 14 Integration and Test
SLAC
24
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Command and telemetry Database Coordination
• The command and telemetry database must be coordinated
between FSW, I&T and IOC.
• IOC will build upon and maintain the software produced by I&T.
• The Schema describing commands and telemetry will written
in a meta language (TBD, e.g., XML or MySQL)
• Schema design will be driven by the details of the ITOS and
Astro RT data bases. We will have the ability to translate to
either.
• The choice of META language may be influenced by the ease of
creating/changing/maintaining the data base.
• The decision of META language and the database partially
populated by IOC CDR.
Document: LAT-PR-01967
Section 14 Integration and Test
25
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
MGSE
Section 14-4
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
26
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT MGSE Development Plan
• LAT-MD-01462, LAT MGSE Development Plan
– Summarizes Assembly Sequence, Precedence document is
LAT-PS-00676
– Defines MGSE Hardware and Tooling Elements
– Defines provision responsibility
– All MGSE Designs to Meet EWR 127.1, as Tailored by SLAC
• Material Yield not more than 85% of Ultimate
• Design Factor of Safety (No Earth Quake) > 3
• Proof Test about 2 times maximum expected load
• Earth Quake per SLAC-I-720-0A24E-001, Specification
for Seismic Design at SLAC.
– Design for 5% Damping to reduce G loading to 1.5 G at 45º
– Does not apply to temporary (crane) operations
Document: LAT-PR-01967
Section 14 Integration and Test
27
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Alignment Tool and Calorimeter Lift Fixture
Alignment Tool and Alignment Rods
available and ready to use
Alignment Rods
Handling Fixture Engagement
Lever
Jack Screws – Holds Tool Above TEM
Connectors
Handling Fixture Engagement
Feature
Calorimeter Lift Fixture Available, Proof Tested and Ready to Use
Lift Fixture Turnbuckles Allow Leveling
Adjustment with 10 kg (22 lb) Alignment Tool
Attached
Alignment Tool Weight Reduced to
about 4 kg (9.0 lbs)
Calorimeter Mass / Outermost
Features Mock Up ~ 93 kg (205 lbs)
EM-Single Grid Bay
In Modification to Support EM
Integration and Test
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Integration Room Layouts
Building-33 Clean Room, Top Looking Down
1 x 4 in EM-Cal Rotation / Support Stand
Crane Operation Zone
(Green)
LAT Transport Container
(Cover Removed)
Van de Graaff Generator
LAT on Rotation
Stand
Building-33 Clean Room, Side View
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Rotation Stand
Y axis rotation point
centered along Y and 90 mm
[3.543 in] below + Z surface
of Grid
Crane Lift Block at
Highest Point
Y axis rotation point centered
along Y and 90 mm [3.543 in]
below + Z surface of Grid
Rotation Stand allows 360º
LAT rotation with ACD
installed
Floor to Crane
Lift Block is
3,404 mm [ 134
in ]
ACD not shown in
entirety
Floor to Top of
GPR is 2,423 mm [
95.4 in ]
Rotation Axis
1,331 mm
[ 52.4 inches ]
From Floor
View Shown is Z Axis
Horizontal, + Z into the Page, Z toward the viewer
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Rotation Stand, Clearances
ACD Height
1015 mm
[ 40 inches ]
Integration
Clearance
51 mm
[ 2 inches ]
TKR Height
640 mm
[ 25.2 inches
]
Total Height
3,150 mm
[ 124 inches ]
Rotation Axis is 90
mm
[ 3.54 inches ]
Below Grid +Z Surface
Rotation Axis is 90 mm [ 3.543” ]
from + Z Grid Surface
Rotation Axis
1,331 mm
[ 52.4 inches ]
From Floor
- LAT Z Axis Vertical (i.e., same as
gravity)
- Crane Lift Block is 3,403 mm [ 134
inches] From Floor
- ACD Concept Lift Fixture 127 mm [ 5
inches] high, Connects Directly to
Crane Lift Block
- Includes X, Y Cg Adjustment
Capability
- Leaves 127 mm [ 5 inches ] Working
Room / Clearance for ACD to ACD Lift
Fixture
ACD Corner
Edge 59 mm
[ 2.3 inches ]
From Floor
With LAT Rotation point 90 mm [3.543
inches] below + Z surface of Grid,
ACD top corner is 1,271.6 mm [50.063
inches] from pivot axis
Minimum Clearance for
ACD + Z Corner to Floor
During Rotation :
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Lift Fixture
• LAT Lift Fixture attached to LAT GPR; Ready for set into LAT Transport Container
• LAT Lift Fixture used to lift LAT, Transport Container Cover and empty Container Base
6” high by 2” wide
by 0.375” wall
¾” CRES Lift Rods
with Turn Buckles
(Turn Buckles Not
Shown )
6” high by 4” wide
by 0.375” Wall
Structural Box
Beam
¾” OTS 316 CRES
Turnbuckles Rated
for 5,200 lbs each
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Transport Container (Truck and Airplane)
•
•
Requires Vibration / Shock Isolation
System
– Allows 154.2 mm (6”) travel in X,
Y and Z for Isolation.
– Isolation Assessment indicates
good loads filtering above 3 Hz.
Baseline Design
– 2159 mm (85”) Tall by 2921 mm
(115”) Wide by 2667 mm (105”)
Deep
– Sized with LAT on GPR that
attaches to Isolation Frame
– Protects LAT on Truck.
– Fits in the following Aircraft,
Upper Cargo Deck Only:
• 747-100F, 747-200C,
Commercial
• MD-11, DC-10, Commercial
• C130, C141 and C5A, Military
Transport
Document: LAT-PR-01967
LAT with
GPR rests
on Shock
Isolation
Frame
2108.2 mm
(83”) Total
Height [6.9ft]
2895.6 mm
(114”)
Across
[9.5 ft ]
2667 mm
(105”) Wide
[8.8 ft ]
101.6 mm (4”) x 101.6 mm (4”) x 6.35 mm
(1/4”) Wall Box Section AL
Section 14 Integration and Test
33
Electrical &
Thermal
Control feed
throughs in
work
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Thermal Vacuum Test Stand
Grid Perimeter Ring
Cutaway LAT
Z Axis Horizontal 90º
Braces
Radiator Support Structure
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Integration, Facilities,
Configuration and Test
Section 14-5
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Verification of proper Installation/Inspection Process
 Acceptance Test Data Package (ATDP, LAT-MD-00408)
Successful completion of subsystem testing, as well as other data, is documented in
an ATDP provided with the component upon delivery to the Responsible Engineer
Authority (REA). QA and I&T sign-off of the ATDP is required before the flight
hardware/software is accepted for integration into the LAT. I&T will perform a suite of
functional tests specified in the ATDP and using subsystem test scripts running on
I&T EGSE. The flight hardware/software must pass this suite of functional tests
before being accepted for integration into the LAT.
 Process documentation
 Electronic Operations log (Web Based)
 I&T Hardware/Software Database (Web Based)
 Electronic Mate – demate log
 Electronic LAT Configuration log
 Hardware/firmware Configuration log
 Software Configuration log
 Hard Copy Traveler
 Non Conformance Report (NCR)
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Electronic Logbook
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Data Base Configuration, Logs
• Flight Hardware
Inventory Data
Base (I&T)
– LAT
Configuration
– Mate-Demate
Log
• GSE Inventory
Data Base
– MGSE
Configuration
– EGSE
Configuration
We are using Oracle
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Assembly Plan
LAT Integration Operations
Larry Wai
IFCT Dept. Manager
*
*
Eric Gawehn
Mechanical Supervisor
*
Mark Molini
Shift A Leader
Reggie Rogers
Shift A
Jeff Tice
Shift B
Brian Grist
Electrical Supervisor
*
TBD
Shift B Leader
*
TBD
Shift A Leader
TBD
Shift A
TBD
ELX Cognizant Engineer
TBD
Shift B
*
TBD
Shift B Leader
• I&T manages, schedules, and is responsible for LAT Assembly
Operations.
• Electronics subsystem supplies electronics flight hardware, and supports
LAT Assembly Operations.
– Electronic shift technicians are supervised by Brian Grist with technical input
from ELX Cognizant Engineer.
– Electronics hires and pays for Electronic shift technicians (4).
• QA (Darren Marsh) is responsible for quality assurance as his team
determines, and supports QA activities during LAT Assembly Operations.
– Larry Wai coordinates scheduling of inspection activities during LAT
Assembly Operations with QA.
* Experienced in I&T of flight hardware/software.
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Installations
Tracker
Installation
Calorimeter
Installation
LAT Inversion
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
System Level Test
Installation/TEM-Level
Bays 8+9 Installation/TEM-Level and System Level Test
+X
+Y
intervening cable tray
TEM connector savers
TEM
9
TEM
8
TEM
9
TEM
8
TEM
9
28V power cable
TEM test cable
TEM-GASU Flight Cables
TEM/PSU-PDU Flight Cables
EGSE Test Point
Step 1: Install Bay 9 TKR, CAL+TEM/PSU.
TEM connector savers already on at
delivery. Install TEM-level test cables and
perform Bay 9 TEM-level test
Pair 1
Step 2: Remove Bay 9 connector savers,
remove TEM-level test cables. Install Bay
8 TKR, CAL+TEM/PSU. Bay 8 TEM
connectors savers already on at delivery.
Install TEM-level test cables and perform
Bay 8 TEM-level test
EM
PDU
TEM
8
Step 3: Remove Bay 8 connector
savers and TEM-level test cables.
Install Bay 8-9 TEM-GASU Flight
cables, intervening cable tray, and
TEM-PDU Flight Cables.
EM GASU
TEM
9
Pair 1
GASU Test Cable
28V EM PDU power cable
Step 1: Complete installation of Bays 8, 9,
intervening cable tray, and TEM flight cables
Document: LAT-PR-01967
Step 2: Temporarily fasten EM PDU+ EM
GASU+power/test cables and perform Bays
8,9 Multi-Tower test.
Step 3: Remove EM PDU, EM
GASU, power/test cables
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Bay Installation/Test Sequence
Pair 2
Pair 2
EM
PDU
EM
PDU
Pair 1
Pair 1
Pair 1
Step 2: Complete installation and test of Pair 2. EM PDU
now remains in place until installation of flight PDU
Step 1: Complete installation and test of Pair 1 (Bays
8, 9, intervening cable tray, and TEM flight cables)
Pair 5
Pair 2
EM
PDU
Pair 2
Pair 4
EM
PDU
EM GASU
Pair 1
Step 3: Complete installation and test of
Pair 3
Pair 5
Pair 4
Pair 2
EM
PDU
EM GASU
Pair 1
Pair 3
Pair 3
Pair 3
Pair 4
EM GASU
Pair 1
Pair 3
Pair 6
Step 4: Complete installation and test of Pair 4. EM GASU
now remains in place until installation of flight GASU
Pair 5
Pair 7
Pair 2
Pair 4
EM
PDU
EM GASU
Pair 1
Pair 3
Pair 6
Step 8: Installation/test of Pair 7, install +/-X cable
trays, fasten flight cables. System level test.
Document: LAT-PR-01967
Step 6: Installation/test of Pair 6, install +/- X cable
trays, fasten flight cables. System level test.
Step 5: Complete installation and test of
Pair 5
Pair 5
Pair 7
Pair 2
Pair 4
EM
PDU
EM GASU
Pair 1
Pair 3
Pair 6
Pair 8
Step 9: Installation/test of Pair 8, install +/-X cable
trays, fasten flight cables. System level test.
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Electronics Mockup used to understand Cable Plant
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
System Level Electronics Installation Sequence
All TEM-PSU positions w/o an Electronic Module have
EMPTY Boxes mounted to them.
Pair 5
Pair 6
Pair 5
Pair 6
Pair 2
Pair 4
Pair 2
Pair 4
EPU
PDU
EPU
EM
PDU
GASU
EPU
PDU
GASU
Pair 1
Pair 3
Pair 7
Pair 8
Pair 7
SIU
SIU
+Y
Step 1: Remove EM GASU, install
test instrumentation on grid, install
flight GASU, remove connector
savers and perform flight mates.
System level test.
+X
+Z
Pair 5
Pair EPU
6
Pair 2
Pair 4
EPU
PDU
GASU
Pair 1
Pair
EPU
7
Pair 5
Pair EPU
6
Pair 2
Pair 4SIU
EPU
PDU
Pair 3
Pair 8
Step 3: Install EPU, EPU-PDU cable,
and EPU-GASU cable. System level
test. Repeat for all 3 units.
Document: LAT-PR-01967
GASU
Pair 1
GASU
Pair 1
Pair
EPU
7
SIU
Pair 8
Pair 8
Step 2: Remove EM PDU, install
flight PDU, PDU-GASU cable, and
perform flight mates. System level
test.
Pair 5
Pair EPU
6
Pair 2
Pair 4SIU
EPU
PDU
Pair 3
Pair 3
GASU
Pair 1
Pair
EPU
7
Pair 3
SIU
Pair 8
Step 4: Install SIU, SIU-PDU cable,
Step 5: Install EMI skirt, Bulkhead
SIU-GASU cable. System level
feed through panels/cables. System
test. Repeat for both units.
level test. ACD FREE simulator test.
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
ACD Installation
•
•
After all 16 Bays
Have Been Loaded,
Precision Crane Op
ACD into position
and Torque
•X-LAT plate assembly process
–Require installation after ACD.
– Can be installed horizontally or
vertically.
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Survey
LAT Survey ACCURACY GROUND TESTS
There is currently a requirement on the knowledge
of pointing accuracy to be better than 7 arcsec.
From the geometry of the Tracker this corresponds
to a survey precision of 20 micron or better. The
strategy for determining the survey accuracy on
the ground is as follows:
• GROUND TRAY SURVEY
– Determine SSD deformation within a tray
and tray-to-tray alignment within a tower
using muon survey, cross-checked by
simulation and TKR subsystem
manufacturing data.
• GROUND TOWER SURVEY
– Determine tower-to-tower alignment using
muon survey, cross-checked by optical
survey, and simulation.
• GROUND GRID SURVEY
– Determine tower-to-grid alignment using
optical survey.
• GROUND SPACECRAFT SURVEY
– Determine Grid to Spacecraft alignment
using optical survey.
• ON-ORBIT SURVEY
– Tray-to-tray and tower-to-tower alignments
will be cross-checked by on-orbit cosmic
ray surveys.
– The tower-to-grid and grid-to-spacecraft
alignment will be cross-checked by an onorbit survey using celestial point sources.
Document: LAT-PR-01967
•
•
The system level survey requirements
and goals are defined in LAT-TD-00895.
The Integration and Test plan to
implement the survey program is LAT-MD01586.
On- Orbit Pointing
Celestial Point Source(s)
On- Orbit Survey
Protons
Muon Survey
NRL TVAC
Star Tracker
Optical Survey
Observatory Integration
Reference Muon
Survey
Reference Optical
Survey
ACD Optical
Survey
LAT Integration
LAT Integration
LAT Integration
TKR Acceptance
Muon Survey
TKR Optical
Survey
LAT Integration
LAT Integration
Section 14 Integration and Test
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•
•
•
•
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Comprehensive Performance Test
Name
Software Tests
Comprehensive performance 1553 Flight
Interface Test
test requirements flow from Command Functional
Memory Upload and Dump
LAT-MD-00408 - LAT
Narrowband Telemetry
Instrument Performance
Wideband Telemetry
Vehicle Signals Interface
Verification Plan.
–
–
CPU-CPU Communications
Will demonstrate the operation EPU Internal Configuration
of all primary and redundant T&DF Internal Configuration
TKR Internal Configuration
circuitry and paths for all
CAL Internal Configuration
operational modes.
ACD Internal Configuration
Parameters will be varied over Event Filtering
their specification ranges to
Electronic Calibration
verify that the unit performs as FSW and LAT Initialization
FSW and LAT recovery
designed.
The Integration and Test
plan to implement the
Electrical Performance test
is LAT-MD-01055.
Comprehensive test will take
3 days.
The Limited Performance
Test will be a subset of these
tests.
Document: LAT-PR-01967
Test ID
FSW001Name
FSW002a
Single
Tower Tests
FSW002b
TKR101
Tracker Temperature
TKR102
FSW003
Bay 0 Test
Register
readback
▲
Bay 1 Test
TKR103
GTRC configuration
TKR201
Bay 3 Test
▲
GTFE left/right configuration
TKR202
Bay 4 Test
▲
GTFE split configuration
FSW006a
TKR203
Bay 5 Test
▲
Tracker FSW006b
reset
TKR204
Bay 6 Test
▲
Tracker FSW007a
Threshold Scan
TKR205
Bay 7 Test
Tracker FSW007b
Charge Injection Scan
TKR206
Tracker FSW007c
Gain and Noise
TKR301
Tracker FSW007d
Layer Timing
TKR401
Tracker Occupancy
TKR501
Bay 10C10
Test
Tracker Occupancy w/ readout
TKR502
Bay 11C10
Test
Tracker Muon Scan
TKR503
Bay 12C9Test
Tracker High Rate / Deadtime
TKR504
Bay 13 Test
FSW004
FSW005
FSW008a
FSW008b
FSW009a
FSW009b
CAL Power Consumption
FSW011
GCRC configuration
GRB Detection
FSW012a
GCFE configuration
Repointing Logic
AFEE configuration
FSW012b
Safe Modes
CAL reset
FSW013a
Science Modes
CAL Pedestals
AEM Test (A)
ACD
FSW015
FSW100
LAT Airborne End-to-End Test
CAL High
Rate Trigger
FSW104
▲
▲
C18
HV
▲
Test (A)
▲
C19
▲
C20
▲
▲
C23
▲
C24
▲
ACD Efficiency Test
FSW101
Single bay trigger
▲
AEM C22
Test (B)
CAL Dead Channels
FSW103 Thresh.
CAL Zero-Suppress
▲
ACD HV Test (B)
CAL Noisy Channels
LAT Performance Verification
▲
▲
FSW014
CAL HI FSW102
Discriminator
▲
Bay 9 Test
Multi-bay high rate▲trigger
CAL Integral non-linearity
Pointed Observation Mode
▲
Multi-bay synchronization
CAL Electronic Gain
CAL LO Discriminator
▲
C11,C12
Bay 15 Test
FSW013b
Sky Survey Mode
▲
Bay 8 Test
Bay 14 Test
T
Charg
Injectio
▲
Tracker Leakage Current
GRB Handling
LAT On-Orbit Initialization
Comprehensive Test
SVAC ID
Flight
Software Tests
Bay 2 Test
FSW010
CAL Temperature
Thermal Control System
Test ID
Tracker Power Consumption
LAT Pointing Calculations
Diagnostic and Calibration Modes
Name
ACD Synchronization
C25
C26
▲
▲
Source:
LAT Electrical Performance Test
INT101
Plan (LAT-MD-01055)
Single bay synchronization
INT102
Single bay muon survey
INT103
Section 14 Integration and Test
C16
47
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Modal Survey Test
•
•
Specialized test equipment requirements
– LAT supported by the Vibe Test Plate
which provides a rigid support of each
mount point
– Vibe Test Plate sits on a massive baseisolated table, to damp high-frequency
base noise being transmitted to the
structure
– Excited using two stingers, located under
the LAT
Test Setup
– Test will be at SLAC because we will
need to remove ACD to uninstall/install
appropriate accels before shipment to
NRL.
– Soft Suspension System With Mass
Loaded Interface
– Pneumatic Isolators used to support
system (provided by NRL)
– LAT Mounted to Steel Plate - Reaction
Mass (provided by SLAC)
– NRL will provide the monitoring
equipment
– Test accelerometers are supplied by TBD
depending on final release of the
Instrumentation Plan .
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
NRL Facilities Overview for Environmental Test
Document: LAT-PR-01967
Section 14 Integration and Test
49
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Particle Test
Section 14-6
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Summary of Science Instrument Performance Verification
(subset of Table 1 of LAT-SS-00010)
Req’t #
Req’t Title
1.Parameter
Verification
Method
Beam Tests relevant to the Verification
5.2.1
Energy Range/
Effective Area
At Normal Incidence:
> 300 cm2 @ 20 MeV
>3000 cm2 @ 100 MeV
>6400 cm2 @ 300 GeV
T=Test
A=Analysis
T, A
1) Van de Graaff 17.6 MeV g
2) Tagged photons 100 to 1000 MeV, norm incidence
3) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety
of angles and transverse positions.
5.2.2
Energy
Resolution
On axis:
 50 % 20–100 MeV
 10 % .1-10 GeV
 20% 10-300 GeV
 6% >10 GeV, Incidence>60°
T, A
1) Van de Graaff 17.6 MeV g
2) Tagged photons 100 to 1000 MeV, norm incidence
3) Positrons 1,2,5,10,20, 40 GeV, variety of angles and transverse positions
5.2.3
Peak Effective
Area
>8000 cm2
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety
of angles and transverse positions.
5.2.4
Effective Area
Knowledge A/A, 1
<50% 20-50 MeV
<25% .05-300 GeV
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety of angles
and transverse positions.
5.2.5
Single Photon Ang
Resolution 68% (onaxis)
< 3.5° front @ 100 MeV
< 6° back
< 0.15° front @ 10-300 GeV
< 0.3° back
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety of angles
and transverse positions.
2) Tagged photons 100 to 1000 MeV, norm incidence
5.2.6
Single Photon Ang
Resolution 95% (onaxis)
< 3 x 68% On-Axis
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety of angles
and transverse positions.
2) Tagged photons 100 to 1000 MeV, norm incidence
5.2.7
Single Photon Ang
Resolution (off axis at
55°)
< 1.7 times on-axis
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety of angles
and transverse positions.
5.2.8
Field of View
> 2 sr
T, A
1) Brems beam, simultaneously all g energy bins from 50 MeV to 20 GeV, variety of angles
and transverse positions.
5.2.11
Time Accuracy
Better than 10 usec relative to S/C time
T, A
1) All Beam Test events record time from Linac RF
5.2.12
Background Rejection
>105:1 (TBR)
T, A
1) 200 K protons (Pattern rejection)
2) Cosmic rays on the ground (ACD rejection)
5.2.13
Dead Time
<100 usec per event
T, A
1) Ground cosmics
2) All Beam Test runs
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Beams
• Cosmics rays on the ground
– EM, CU, LAT
• Van de Graff (17.6 Mev g)
– EM, CU (TBR), LAT (TBR)
• End Station A positrons (1- 40 Gev)
– CU
• End Station A tagged photons (~100-1000 Mev)
– CU
• End Station A brems photons (> 20 Mev – 20 Gev)
– CU
• End Station A protons (~12 Gev)
– CU
• Cosmic rays in airplane (25,000 - 35,000 feet) (few hours) (TBR)
– LAT
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Ground Cosmic Rays (Examples)
•
•
•
•
Each tower as it becomes available at SLAC
– ~106 muons/day x 3 days (TBR) (use 3 in-a-row tracker trigger)
– Natural cosmic solid angle distribution. External muon telescope.
Calibration Unit
– Inter tower survey.
Full LAT
– ~108 muons/day (using 3 in-a-row tracker trigger)
– Inter tower survey
– Calibrate individual CsI xtals
• ADC chans/MeV
• Positional dependence
– Calibrate tracker
• Dead and noisy strip map
• Straight tracks survey relative tray and tower positions
– Calibrate ACD
• ADC chans / MeV
• Calibrate discriminator thresholds
• Efficiency vs position
– Trigger and DAQ
• Efficiency vs position
For a full list of calibrations see LAT-MD-00446.
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Van de Graaff Installed
Beam Pipe
Bldg 33 Clean Room
Inside Clean room
Heritage from previous use in Crystal Ball experiment by members of I&T.
This VDG was used for 8 years at SLAC and then shipped to DESY (Hamburg,
Germany). During this time it was used routinely for CB calibration using g lines
produced by the VDG.
Document: LAT-PR-01967
Section 14 Integration and Test
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Beam Test Measurement Strategy
•
•
•
First, calibrate Calibration Unit energy response
– 1– 40 Gev e+ with variety of x,y,θ (6 days) (small extrapolation to g with MC).
– Calibrate tagged photon beam with BGO array (BGO energy calibrated with
VDG and radioactive sources) (1 day).
– 100-1000 Mev tagged photons at normal incidence (2 days).
– 17.6 MeV g from Van de Graff (< 100 MeV) TBR.
Second, take photon data for testing the Monte Carlo (use CU for energy
measurement).
– Bremsstrahlung g beam at one e+ energy (20 Gev) (20 days)
– Simultaneously measures all g energies from 50 Mev to 20 GeV
– Bremsstrahlung spectrum has equal numbers of g per % width energy bin.
– The already energy calibrated LAT bins the photons into 50% energy bins
(1.5  lower edge of bin), except 17.5-20 GeV bin.
– An example of bin edges= [GeV]
– 0.040, 0.060, 0.090, 0.135, 0.203, 0.304, 0.456, 0.683,1.02, 1.54, 2.31, 3.46, 5.19,
7.78, 11.70, 17.5, 20 GeV
Third, take hadron data for testing the simulation and measuring the pattern cut
rejection factor.
– ~200 K protons @ .0044 /pulse x 30 Hz x 30 days x .58 accelerator efficiency
– This is the number of protons we recorded in 30 days in Beamtest 99.
Document: LAT-PR-01967
Section 14 Integration and Test
55
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Science Verification, Analysis,
and Calibration
Section 14-7
E. Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
56
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
SVAC System Responsibilities
•
Capture Science and Calibration requirements from
Subsystems Plans. (LAT-MD-00446)
•
Prepare the SVAC plan (with review from subsystems). (LAT-MD00446)
•
To verify Science and Calibration Requirements
•
Provide the final I&T calibration products to SAS and IOC
•
Develop Calibration Compliance Matrices for pre and post
launch operations
•
Coordinate Data Analysis (with support from subsystems LATMD-00613) using data obtained from particle beams and cosmic
rays during LAT assembly, environmental and spacecraft
integration tests
•
Demonstrate that the LAT is calibrated prior to launch and
perform the first on-orbit calibration prior to hand off to IOC
after fabrication phase is completed
Document: LAT-PR-01967
Section 14 Integration and Test
57
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Functional Test -> Calibration, Science Verification flow
Reconstruction and Monte Carlo Software
(SAS)
Functional
Tests
(IFCT)
Low-Level
Calibration
(SVAC)
High-Level
Calibration
(SVAC)
Science
Verification
(SVAC)
I&T
LAT subsystems hardware , EGSE scripts
and reference calibration datasets
(ACD,CAL,TKR,ELX)
Document: LAT-PR-01967
Section 14 Integration and Test
58
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Calibration
•
•
Calibration relies on a LAT-wide collaboration effort and cooperation with the
LAT Instrument Scientist, System Engineering and the Instrument Operations
Center
– Individual Subsystems and Science Requirements are captured in a
compliance matrix in LAT-MD-00446
– Contributed Manpower is described in LAT-MD-00613
– Infrastructure needed is described in LAT-MD-001587
Calibration is a 3-step Process
1. Preparation
– Develop and Test EGSE scripts, calibration algorithms, databases,
report capabilities using the Engineering Model
– Update tools and calibrations to provide a calibrated CU for science
verification
– Develop concepts for on-orbit calibrations
2. Demonstration by pre launch tests
– Prove that we met the Calibration Requirements by calibrating the
LAT on the ground
– Test and Verify concepts for on-orbit calibrations
3. Demonstration by post launch tests
– Update calibrations by perform on-orbit calibrations during checkout
phase
– Implement procedures within the IOC framework
Document: LAT-PR-01967
Section 14 Integration and Test
59
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Data Analysis
•
•
SVAC analysis is essentially offline and relies on reduced data
produced by the
– EGSE software for calibration purposes
– SAS software for calibration purposes
• For calibration types, which can be performed with both EGSE
and SAS software, results from the former are used as a
reference.
– SAS software for Science Verification
Two important aspects of the data analysis
1. Calibration Data
– Verify the electronics requirements, thus calibrate the
instrument
– Provide pre-launch history of calibration (including changes
due to environmental effects)
– Provide a metric to monitor procedures during Integration and
Test
– Provide required input to the SAS software used for Science
Verification
2. Science Verification Data
– Determine the LAT performance
Document: LAT-PR-01967
Section 14 Integration and Test
60
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Science Verification
•
•
Science verification relies on a LAT-wide collaboration effort and on
the guidance from the LAT Instrument Scientist
– Individual Subsystems and Science Requirements are captured
in a compliance matrix in LAT-MD-00446
– Contributed Manpower is described in LAT-MD-00613
– Infrastructure needed is described in LAT-MD-001587
Science Verification is a 3-step Process
1. Preparation
– Develop and Test Monte Carlo Simulations prior to particle
beam tests
– Calibrate CU
2. Validation with Particle Beams
– Use beam test data with CU to validate Monte Carlo
simulations for a set of energies, incident angles and impact
points.
3. Demonstration by Analysis
– Prove that we met the Science Requirements by evaluating
the LAT performance in a larger set of energies, angles and
impact points
Document: LAT-PR-01967
Section 14 Integration and Test
61
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
SVAC Timeline
2003 Engineering
Model 1
Prototype algorithms and database infrastructure
Prototype interface with EGSE and SAS
Calibrations
2004 LAT
2005
Final alignment
Validation of on orbit calibration scheme
Calibration dependence on environment
Calibration time history prior to launch
2005 Calibration
Unit
Calibrations (prototype inter tower alignment)
Science Verification (Monte Carlo Validation)
Validate SVAC database design
Prototype of on-orbit low level calibration scheme
Document: LAT-PR-01967
Section 14 Integration and Test
62
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
On-orbit Calibration (LAT-MD-00446)
•
On-orbit Calibration benefits from LAT-wide
collaboration effort and IOC leadership.
–
–
–
•
On orbit Calibration Strategy (TBR for IOC CDR)
–
–
•
I&T and IOC will a share a scientist to ensure a smooth
transition between pre and post launch operations
I&T will support the development and testing of
operational concepts during the pre launch activities.
I&T will deliver a calibrated instrument to the IOC.
Two special data taking modes
• Selected events from Galactic Cosmic Rays
(survey, energy calibration,…)
• Charge injection to verify front-end electronics
(low level calibration)
Post launch Calibration tasks are identified in LAT-MD00446.
Requirements
– Establish Internal Alignment of the TKR using
Galactic Cosmic Rays
– Align CAL
– Align ACD
– Calibrate Alignment between the LAT and the
Spacecraft GN&C System
– Calibrate CAL Energy Scales
– Calibrate ACD Energy Scales
– Calibrate Systematic Offsets with viewing
angle
– Verify PSF over FOV
– Verify Background Rejection
– Effective Area Uniformity Map
– Data reduced on-orbit or on ground TBR
– Frequency of calibrations TBR
Document: LAT-PR-01967
ID
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C18
C19
C20
C21
C22
C23
C24
C25
C26
C25
C26
Task
Name
Processing
Frequency
Phase
on ground
board
ACD Detection Efficiency
0,1,2
ACD Veto threshold
0,1,2
●
ACD Pedestals
0,1,2
●
ACD MIP peak
0,1,2
●
ACD Integral Linearity
0,1,2
●
TKR Tray Alignment
0,1,2
TKR Tower Alignment
0,1,2
TKR LAT & Observatory Align.
0,1,2
TKR Single Hit MIP efficiency
0,1,2
TKR Noisy Channels
0,1,2
TKR Dead Channels
0,1,2
●
TKR Time-Over-Threshold Signal 0,1,2
●
TKR Time-Over-Threshold Dist.
0,1,2
●
CAL Light Asymmetry
0,1,2
CAL Light Attenuation
0,1,2
CAL Light Yield
0,1,2
CAL Pedestals
0,1,2
●
CAL Electronic Gain
0,1,2
●
CAL ntegral non-linearity
0,1,2
CAL differential non-linearity
0,1,2
CAL noisy Channels
0,1,2
CAL Dead Channels
0,1,2
CAL LO Discriminator
0,1,2
CAL Hi Discriminator
0,1,2
CAL Zero-Suppress Threshold
0,1,2
Deadtime
0,1,2
●
Time Accuracy
0,1,2
●
Section 14 Integration and Test
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
63
bi-weekly
bi-weekly
bi-weekly
bi-weekly
bi-weekly
monthly
monthly
yearly
monthly
monthly
monthly
monthly
monthly
>>monthly
>>monthly
monthly
monthly
monthly
monthly
yearly
monthly
monthly
monthly
monthly
yearly
daily
daily
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Cost and Schedule
Section 14-8
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
64
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
CCB Actions Affecting 4.1.9
Change Request #
Description
Status
LAT-XR-00952-01
I&T Technical
Support
Approved, $19K
LAT-XR-01063-01
MGSE Schedule
Approved, $0K
LAT-XR-01195-01
CAL Additional EM & Approved, $1K
QM TV Testing
LAT-XR-01324-01
Shift Resources to
Cover Additional
Mgmt Expense
Approved, $0K
LAT-XR-01451-01
I&T MGSE Schedule
Change
Approved, $0K
LAT-XR-01752-01
SLAC/HEPL Labor
Escalation Rate
Change
Approved, -86K
Document: LAT-PR-01967
Section 14 Integration and Test
65
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
4.1.9 Work Flow Summary
Document: LAT-PR-01967
Section 14 Integration and Test
66
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Key Deliverable Milestones
Activity
Description
FY 04
FY 05
JAN FE B MAR AP R MAY JUN JUL AUG SE P OCT NOV DE C JAN FE B MAR AP R MAY JUN JUL AUG SE
OCT
P
4.1.9 I&T
Flight Tracker T ower 1, 2 RFI from I&T to I&T
Flight Calorimeter T ower 1,2 RFI from I&T to I&T
LAT Ready to Shi p
Run Date
04/21/03 15:05
Data Date
04/01/03
© Primavera Systems, Inc.
Document: LAT-PR-01967
G LA ST L A T PR OJ EC T
A V: F loa t to
Le ve l 3 M ile sto nes
Forecast
Baseline
Product Available Date
Forecast
Baseline
Integration Need Date
LT-T7: Level 3 to AV :(tb)
FL-D7 Integration Mil estones CDR
AV : Up Triangle, L3: Down Triangl e
Section 14 Integration and Test
Sheet 6
67
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Critical Path
• LAT Integration
– Sequence from subsystem deliverables to reference
comprehensive test
• Environmental Test Sequence
• Final Comprehensive Test
Document: LAT-PR-01967
Section 14 Integration and Test
68
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Budget, Cost, Performance
Budget vs Actuals vs Performance
DOE + NASA Project Expenditures
4.1.9 Instrument I&T
$M, Then-Year Dollars
10
5
Actual Commitments
ACWP
BCWP
BCWS+ Planned Commitments
BCWS
0
. .
FY00
. .
. .
. .
. .
FY01
Document: LAT-PR-01967
. .
. .
. .
FY02
. .
. .
. .
. .
FY03
. .
. .
. .
. .
FY04
. .
. .
. .
. .
. .
. .
FY05
Section 14 Integration and Test
69
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Cost/Schedule Status
•
Status as of March 31, 2003:
Item
In k$
Budget at Complete
6,588
Budgeted Cost for Work Scheduled (a)
1,639 (a)
Budgeted Cost for Work Performed (b)
1,624 (b)
Actual Cost for Work Performed
1,612
Cost Variance
12
0.74% of (b)
Schedule Variance
-15
-0.92% of (a)
Document: LAT-PR-01967
Section 14 Integration and Test
70
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Procurements
• Long-Lead Procurements
– None
• Major Upcoming Procurements Near-Term (< 4 months)
– None
• Major Upcoming Procurements Long-Term (>4 months)
– Lat Transport Container, other Major MGSE.
• Minor Upcoming Procurements
– CU Lift Fixture, other Minor MGSE.
Document: LAT-PR-01967
Section 14 Integration and Test
71
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Risks & Summary
Section 14-9
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
72
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Airplane Test
•
•
•
Potential risk mitigation item.
Expose the LAT to charged particle fluxes similar to those in orbit. Do
an End-to-End test of the LAT in as close to orbital environment as
practical. This test is for risk reduction.
– Demonstrate the complete LAT system functionality at in-orbit
cosmic rates and higher. See LAT-TD-00550 “LAT Test Plan for
Airplane”. Constitutes an end-to-end test of the LAT.
General hardware tests for the complete LAT system at high particle
rate:
– Verify DAQ operation at estimated orbital rates.
– Verify event quality.
– Verify trigger functionality in the various trigger modes at
estimated orbital rates. (Much higher than ground cosmic rays).
– Measure livetime in the various trigger modes as determined by
LAT hardware.
Document: LAT-PR-01967
Section 14 Integration and Test
73
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
I&T Risk Summary
ID #
Risk
Rank
Risk Description
• Late Finalization of all LAT test
plan requirements.
• Leads to a potentially
compressed schedule and
increased cost for I&T.
I&T/002
Moderate
Risk Mitigation
1) End to end functional &
performance evaluation audit to
be completed by System Eng in
support of 6/17/03
2) Finalization of requirements for
radiator on or off during acoustic
test established 15-AUG-03
(Allows complete mechanical
analysis evaluation)
3) Airplane test contingent on
above audit and test planning
WG (Leisgang, Ritz, Bloom)
recommendations to Althouse
by November 1, 2003.
Document: LAT-PR-01967
Section 14 Integration and Test
74
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
I&T Risk Summary
ID #
Risk
Rank
Risk Description
Risk Mitigation
• LAT needs to be disassembled
I&T/005
High
1) Have detailed plan to execute
late in I&T sequence to
disassembly in place before I&T
repair/replace failed subassembly.
of the LAT begins-required for
IRR.
• Big impact on cost and schedule
could result.
2) Prepare to do all repair work at
NRL during environmental
testing if needed.
Document: LAT-PR-01967
Section 14 Integration and Test
75
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Summary
• The I&T subsystem is on schedule and on budget.
• All departments of I&T are performing to the PMCS within
acceptable bounds.
• We have made significant developmental progress using the
EM TKR minitower over the past month, and expect much more
developmental inputs to I&T assembly and testing procedures,
and EGSE working with the final deliveries of the TRK EM
minitower and CAL EM in July and August of this year.
• Observatory support plans are firming in parallel with progress
at Spectrum Astro on the spacecraft. (Spacecraft PDR was last
week.)
• Though there are future risks in schedule and budget, we
believe at this time that they are within the I&T current scope
(including contingency).
Document: LAT-PR-01967
Section 14 Integration and Test
76
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Supplemental Slides
Section 14-10
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
77
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Overview Supplemental
Appendix A
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
78
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
I&T Organization Chart
Integration and Test
E. Bloom, Manager (SU-SLAC)
B. Grist, I&T Engineer (SU-SLAC)
WBS 4.1.9, 4.1.9.1
Instrument Operations
Coordinator
Reliability & QA
D. Marsh, Manager (SU-SLAC)
WBS 4.1.9.2
D. Lung, Manager (SU-SLAC) - Acting
WBS 4.1.9.3
Mechanical Ground
Support Equipment
Online Software
R. Claus, Manager (SU-SLAC)
WBS 4.1.9.5
E. Gawehn, Manager (SU-SLAC)
WBS 4.1.9.4
Integration, Facilities,
Configuration, and
Test
L. Wai, Manager (SU-SLAC)
WBS 4.1.9.6
Environmental Test
Particle Test
M. Lovellette, Manager (NRL)
WBS 4.1.9.8
G. Godfrey, Manager (SU-SLAC)
WBS 4.1.9.7
Science Verification,
Analysis, and
Calibration
E. do Couto e Silva, Manager (SU-SLAC)
WBS 4.1.9.9
Mission
E. Bloom, Manager (SU-SLAC)
WBS 4.1.9.A
Document: LAT-PR-01967
Section 14 Integration and Test
79
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Document Tree
LAT Integration and Test Plan
LAT-MD-01376
E. Bloom / B. Grist
LAT SVAC Test Plan
Detailed Procedure
text
text
text
text
LAT-MD-01587
E. do Couto e Silva
Survey and Alignment Plan
Detailed Procedure
text
text
text
text
LAT-MD-01586
L. Wai
EMI Test Performance Plan
Detailed Procedure
text
text
text
text
LAT-MD-01838
M. Lovellette
Thermal Test Performance Plan
Detailed Procedure
text
text
text
text
LAT-MD-01837
M. Lovellette
Dynamics Test Performance Plan
Detailed Procedure
text
text
text
text
LAT-MD-01836
M. Lovellette
MGSE Development Plan
Detailed Procedure
text
text
text
text
LAT-MD-01462
E. Gawehn
Weight and CG Test Plan
LAT-MD-01598
E. Gawehn
EGSE Plan
Detailed Procedure
text
text
text
text
Detailed Procedure
text
text
text
text
LAT-MD-01533
R. Claus
LAT Facilities Plan
LAT-MD-01386
L. Wai
LAT Assembly Sequence
Detailed Procedure
text
text
text
text
Detailed Procedure
text
text
text
text
LAT-MD-00676
L. Wai
LAT Beam Test Plan
LAT-MD-00440
G. Godfrey
Electrical Test Performance Plan
LAT-MD-01055
L. Wai
Document: LAT-PR-01967
Detailed Procedure
text
text
text
text
Detailed Procedure
text
text
text
text
Section 14 Integration and Test
80
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
EGSE Supplemental
Appendix A
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
81
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
EGSE Deliverables (Electronics + I&T Support)
• Hardware/Software support for various incarnations of I&T test-stands
 Single Tower EGSE v2 . Delivered 12/02. (18 units distributed to
subsystems and 2 to I&T)
– Single Tower EGSE v3 First release Due 8/03. (18 software
upgrades distributed to subsystems and 2 to I&T)
– LAT I&T Prep Unit. Due 2/04 (1 to I&T)  CU beam test.
– Flight Unit (FU). Due 5/04. (1 plus 1 spare to I&T)
• Test-stand system composition
 Infrastructure (workstations, networking, crates, etc.)
 Test executive
 Graphical User Interfaces (GUIs)
– Databases and tools
 Data analysis tools
 Data archiver
– Test procedures
 Code management, release control and distribution
 Remote debugging tools
Document: LAT-PR-01967
Section 14 Integration and Test
82
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
EGSE & Online Software
•
•
•
•
Real-time system
– Embedded processors running the VxWorks RTOS
– Data acquisition and control by Trigger & Dataflow system
– Gathering of Housekeeping quantities
– Auxiliary equipment data acquisition into event builder, e.g., during beam
tests
LAT Test Executive (LATTE) developed using Python, Qt and XML provides:
– Configuration management
– Commanding
– Online data acquisition, archiving and distribution
• Persistent data stored in FITS files
– Data quality and Housekeeping quantity monitoring
Data visualization and analysis
– HippoDraw: a visualization tool.
EGSE Verification/Qualification
– EM
– Software Test Bed
– On delivery of subsystem hardware, I&T will perform a suite of functional
tests specified in the ATDP and using subsystem test scripts running on
I&T EGSE. The flight hardware/software must pass this suite of functional
tests before being accepted for integration into the LAT.
Document: LAT-PR-01967
Section 14 Integration and Test
83
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
MGSE Supplemental
Appendix A
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
84
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT MGSE List
•
•
•
•
•
•
•
•
•
•
•
•
EM Single Bay (1x1 grid)
EM-Cal Rotation / Support Stand EM
Lifting Fixture (supplied by Tracker)
EM ACD Scintillator Support Fixture
Calorimeter Lift Fixture
Calorimeter Alignment Tool
Calibration Unit (1 x 4) to Rotation
Stand interface plates
CU Integration Stand Proof Test
Article
Calibration Unit Lift Fixture
Calibration Unit ACD Support
Fixture
Calibration Unit X, Y, θ Movement
System (for Beam Test)
Thermal – Dew Point Control Tent
(Double Walled) for Beam Test
CU & LAT Thermal Control Cart
Ducting, Hoses, Cold plates
Document: LAT-PR-01967
•
•
•
•
•
•
•
•
•
•
•
•
•
Grid Perimeter Ring (GPR)
Rotation Stand
Rotation Stand Proof and Protocol
Test Article
ACD Integration Frame
ACD Lift Fixture
ACD Lift Fixture Proof Test Article
LAT Shipping Container
Staging Tables
Vibration Test Fixture
Thermal Vacuum Support Kit
Acoustic Test SC Simulator (TBR)
Van de Graaff Support Stand
Calibration Unit Transport Box
Section 14 Integration and Test
85
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Integration Prep Stand
1 x 4 Grid,
Empty
Level Fine Tune
Adjust Tool,
Removed Before
Powering Up Drive
Motor
1 x 4 Grid Interface Plate.
Also Interfaces with the CU
Lift Fixture
Calorimeter
Rotation
Interface
(Designed to Fall
Away When Person
Lets Go of it)
Calorimeter Rotation
Configuration
Multi-Function Support: EM, I&T Prep, CU Integration,
and Acts as Calorimeter Rotation Stand for LAT I&T.
Proof Test Stand
with 1360.8 kg
(3,000 lbs)
Proof Test Cal
Rotation Interface
to 204.1 kg (450
lbs)
Document: LAT-PR-01967
Calorimeter
Alignment System
Not Shown for
Clarity
Install 1st
Tracker, Attach
Calorimeter to
Rotation
Interface with
+ Z Up
Use SLAC Lift Fix and
Rotate 1x 4 with Tracker
Alignment System to Install
and Calorimeter, Then
Calorimeter
Attach SLAC Lift Fix
Section 14 Integration and Test
86
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Remove LAT from Integration Stand
• Hook height is 3,403 mm [ 134 inches ]
• No problem moving LAT from integration stand
LAT Lift Fixture
2,997 mm
[ 118 in ]
1,346 mm
[ 53 in ]
Document: LAT-PR-01967
Section 14 Integration and Test
87
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Transportation Container Clearances
• LAT Lift Fixture is used for lifting LAT and the LAT Transport Container Cover
– Can also be used to lift empty Transport Container (but not with LAT inside)
• Fork Lift required to move Transport Container with LAT inside
76 mm
[ 3 in ]
LAT Transport
Container Cover
1,270 mm
[ 50 in ]
51 mm
[ 2 in ]
3,353 mm
[ 132 in ]
LAT attached to
Vibration Isolation
System
922 mm
[ 36.3 in ]
1,748 mm
[ 68.8 in ]
LAT Transport
Container Base
Document: LAT-PR-01967
826 mm
[ 32.5 in ]
Section 14 Integration and Test
88
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Integration, Facilities,
Configuration and Test
Supplemental
Appendix A
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
89
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
GLAST Integration Area – Building 33 SLAC
Subassembly Preparation Clean Room
Class 100,000
EGSE Room
Gowning Room
Office Area
Receiving
Area Covered
by 15 Ton
Crane
5 Ton Crane
LAT Assembly Clean Room
Class 100,000
Van de Graaff Accelerator
with Beam Pipe Protruding
into Clean Room
Document: LAT-PR-01967
Locked Fence
Flight Stores Lockup
Section 14 Integration and Test
90
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Reviews
•
Test Readiness Review- LAT-MD-00408 LAT Instrument Performance Verification Plan
– A test readiness review will be conducted prior to commencing a flight level test
program as required in the Systems Engineering Management plan, LAT-MD00066. Topics to be addressed at the review are:
• Changes since CDR
• Test Requirements
• Planned tests
• Test Entry / Exit Criteria
• Test facilities
• Equipment calibration
• Test configurations
• Test procedure status
• Staffing plans
• System performance review
• Quality program review
• Problem / failure reports
• Risk assessment
• System safety
• Test schedule
• Issues and concerns
Document: LAT-PR-01967
Section 14 Integration and Test
91
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
I&T Flow and Test Plans
•
The system level test requirements
flow from the LAT Instrument
Performance Verification Plan
through system and subsystem level
plans as well as directly to I&T
Integration and Test Flow
LAT
Integration
CAL
Grid
TEM/PS
O
2/28/05
F
11/18/04
C
C
Survey
E
10/13/04
EPU
F
10/14/04
Integrate
A E-Boxes
w/ Grid
3/12/05
EMI/EMC
M Survey (2)
SIU
4/06/05
L Sine Vibe
Sine Burst
Weight
PDU
GASU
O Survey
Htr Switch Box
Integrate
EMI Skirt, Htr
F
switch boxes
E
EMI Shield
Observatory
Integration
Environmental Tests
6/15/04
Integrate
TKR/CAL &
TEM's with
Grid
E
A
TKR
Modal
survey
4/21/05
L Balance
C
9/03/05
C
Cycling
M
L
M
C
Survey
5/22/05
C
LAT
Integration
L
O
C
Thermal
Vac
C M
Install
Radiators
L
Weight & CG
C
O M Survey
02/14/05
4/15/05
L Acoustic
10/27/04
ACD
Integrate ACD
E
F
X-LAT Plate
E
Integrate
X LAT Plate
O
Ship to
NRL
C
F
M Survey
L
Final
C
5/27/05
Ship to
SLAC
C
Survey
@NRL
9/01/05
Aliveness
Tests
Survey:
Calorimeter Test
Plan
LAT-SS-00262
Subsystem
Integration Tests
E-GSE
LAT-MD-01533
M. Huffer
R. Claus
ACD Test Plan
LAT Limited
Performance
Tests
Thermal S/S Test
Plan
No Number
Functional
Tests
F
O
Optical
L
M
Muon
Document: LAT-PR-01967
Limited
Performance
LAT
Comprehensive
Performance
Tests
LAT Operational
Performance Tests
Electronics Test
Plan
LAT-TD-00296
SUI
TEM
EP
PDU
LAT Instrumentation Plan
LAT-MD-00890
M. Lovellette
W. Davis
Facilities
LAT-MD-01386
LAT Survey & Alignment
L. Wai
LAT-MD-01586
LAT Survey Plan
LAT-TD-00895
L. Wai
M. Nordby
Mechanical Weight & CG
LAT-MD-01598
E. Gawehn
L. Wai
Dynamics Tests
LAT-MD-01836
E. Gawehn
M. Lovellette
Mechanical S/S
Test Plan
LAT-SS-00493
LAT Flight Software
Test Plan
LAT-TD-00786
L. Wai
LAT Contamination Control
LAT-MD-00404
Plan
J. Cullinan
E. Gawehn
LAT Dynamics Test Plan
LAT-MD-01196
Y Ismael
M. Lovellette
Electrical Performance Tests
LAT-MD-01055
L. Wai
Thermal Tests
LAT-MD-01837
E. Gawehn
M. Lovellette
LAT Thermal Test Plan
LAT-MD-01600
M. Lovellette
J. Wang
LAT EMI Tests
LAT-MD-01838
LAT EMI/EMC Test Plan
No Number
M. Lovellette
T. Leisgang
M. Lovellette
LAT SVAC Test Plan
LAT-MD-01587
E. do Couto E Silva
SVAC Plan
LAT-MD-00446
E. Do Couto E Silva
@ Spectrum
Astro
Radiators
A
LAT Mechanical Integration
LAT-PS-00676
E. Gawehn
L. Wai
LAT Handling
&Transportation Plan
LAT-MD-00452
LAT-MD-00649
Particle Test Plan
LAT-MD-00440
G. Godfrey
L
Electrical
InterfaceTests
LAT Integration & Test
Plan LAT-MD-01376
E. Bloom
M-GSE
E. Gawehn LAT-MD-01462
GASU
Store
LAT
Ship
to SA
LAT
Performance &
Operation Test
Plans
Component
Aliveness Tests
6/01/05
Mechanical
Fit-Checks
E
Subsystem Test
Plans
ACD-PLAN-000050
Remove
Radiators
4/12/05
T. Leisgang
Tracker Tower Test
Plan
LAT-TD-00155
LAT Test
Thermal Vacuum
Tower
Integration
LAT Instrument Performance
Verification Plan
LAT-MD-00408
C
Comprehensive
Performance
Test Plan Flow plans
v3 CDR 4/21/03
Section 14 Integration and Test
92
S. Ritz
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Survey Tests
Integrate Towers
1A: 1-Tower
optical survey
1B: 8-Tower
optical survey
Int. ACD
Ship/Vibe
2A,B,C: LAT baseline
muon survey
1C: 16-Tower
optical/muon survey
#
Goal
Verify SS stayclears, TKR
1A
alignment accuracy
Verify SS stayclears, TKR
1B
alignment accuracy
Verify SS stayclears; establish
1C
baseline position of all TKR's
When/Where
SLAC, after 1st TKR
module is integrated
SLAC, after 4 TKR
modules are integrated
SLAC, before ACD
integration
SLAC, after ACD and XLAT Plate integration
2A Verify ACD stay-clears
2B
2C
3A
4A
4B
4C
Establish baseline position of
TKR's with ACD on
Characterize gravity effect on TKR
position w/ ACD
Re-baseline TKR positions after
transport, vibe
Characterize thermal effects on
LAT at min temp
Establish baseline position of
TKR's at nom operating temp
Characterize thermal effects on
LAT at max temp
T-Bal/T-Vac
4A,B,C: T-Vac muon
survey at temp
>3 Cosmic Ray
test for continual
monitoring.
3A: Pre-T-Vac
muon survey
Orient. Method
Support/Configuration
4 corners on GPR; 1 TKR/CAL/ TEM
tower integrated. LAT off
4 corners on GPR; 8 TKR/CAL/ TEM
towers integrated. LAT off
3 mid-sides on GPR; ACD not on
LAT on. Push on 4th mid-side.
4-corners on GPR; ACD integrated.
LAT off.
+Z Up
Optical
+Z Up
Optical
+Z Horiz
Optical/
Muon
+Z Up
Optical
SLAC, after CPT
+Z Horiz
Muon
3 mid-sides on GPR
SLAC, after CPT
+Z Up
Muon
3 mid-sides on GPR
NRL, after vibe and before
T-Vac pump-down
+Z Horiz
Muon
3 mid-sides on T-Vac STE
NRL T-Vac Chamber
+Z Horiz
Muon
3 mid-sides on T-Vac STE
NRL T-Vac Chamber
+Z Horiz
Muon
3 mid-sides on T-Vac STE
NRL T-Vac Chamber
+Z Horiz
Muon
3 mid-sides on T-Vac STE
Cooling
None
RT
None
RT
Elec: forced air;
Det: conduction
None
Elec: forced air;
Det: conduction
Elec: forced air;
Det: conduction
Elec: forced air;
Det: conduction
Elec: X-LAT Pl,
Det: conduction
Elec: X-LAT Pl,
Det: conduction
Elec: X-LAT Pl,
Det: conduction
Source: LAT-MD-00895 “LAT Instrument Survey Plan”
Section 14 Integration and Test
17 C
RT
LAT Optical and Muon Surveys During Integration and Test
Document: LAT-PR-01967
Temp
93
17 C
17 C
17 C
-5 C
8C
17 C
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Optical Survey Test Equip and Setup
•
•
•
•
•
•
The optical surveys will be performed with a laser tracker supplied by the SLAC Metrology
Department.
The Laser tracker(s) require continuous line of sight to the sphere mounted reflector as it is moved
from the laser tracker test point to the measurement point.
The laser tracker will be mounted on stands to allow the laser tracker to view all reflectors.
All surveys will be performed in the SLAC Building 33 LAT integration facility.
Room temperature controlled to within 5 oC (TBR)
I&T will provide the Survey Scientist for analysis of data from surveys
Equipment/Tool
Quantity/Unit
Supplier
Laser tracker
1 portable unit
1-1/2” sphere mounted
reflectors
¾” sphere mounted reflectors
66 reflectors w/ bushings
Surveyor
Tracker top tray “hat”
2 workers x 11 times x 4
hrs
17 units
SLAC Metrology Dept.,
Alignment Engineering Group
SLAC Metrology Dept.,
Alignment Engineering Group
SLAC Metrology Dept.,
Alignment Engineering Group
SLAC Metrology Dept.,
Alignment Engineering Group
TKR subsystem
Flight grid reamed holes
4 holes x 4 sides
Mechanical subsystem
ACD mounting points
3 points x 4 sides
ACD subsystem
Feeler gauges
2 units
I&T
Document: LAT-PR-01967
18 reflectors w/ bushings
Section 14 Integration and Test
94
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Mass Properties
•
•
•
The Integration and Test mass properties measurement plan is:
Mechanical Weight and CG Plan LAT-MD-01598
WEIGHT DETERMINATION
– Weights of all LAT flight subsystem and MGSE elements will be
measured to an accuracy 0.025% of its determined weight.
CENTER OF GRAVITY MEASUREMENT
– Cg measurement of all LAT flight subsystem elements will be
performed to an accuracy of ±1.0 mm [± 0.039 inch]for X, Y and Z
axes (axes as defined in LAT-TD-00035, LAT Coordinate System).
– Cg measurement of the integrated LAT (minus radiator hardware
as described above) will be performed to an accuracy of ±2.0 mm
[± 0.079 inch] in the X and Y axes and Z axes.
– Cg measurement of the LAT Vibe Test Fixture will be performed to
an accuracy of ±2.0 mm in the X, Y and Z axes.
– Cg measurement of the LAT Transport Container will be measured
to within ± 152 mm [± 6 inches] for the X, Y and Z axes.
• Definition of the LAT Transport Container axes is to be
consistent with the LAT when mounted inside the container.
Document: LAT-PR-01967
Section 14 Integration and Test
95
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Modal Survey Test
•
•
•
•
•
XYZ-Mnt
XYZ-ACD
X-ACD
Z-ACD
XYZ-ACD
Y-ACD
Y-ACD
X-ACD
Out-of-Plane
Accel
Tri-axis Accel
XYZ-ACD
•
XYZ-Grid
XYZ-Mnt
The system level requirements are defined in the LAT Dynamics Test
XYZ-Grid
XYZ-Grid
Plan LAT-TD-001196.
12
14
15
Z-TKR
X-TKR
X-TKR
13
The I&T plan to implement the Modal Survey is in the LAT Dynamics Test
XYZ-CAL
Y-TKR
Y-TKR
Performance Plan LAT-MD-01836.
LAT
+Y
8
9
10
11
Y-TKR
Configuration
Z-TKR
LAT +X
XYZ-CAL
Z-TKR
X-TKR
XYZ-Grid
– Fully integrated, except the Radiators are not mounted
XYZ-Grid
5
6
7
Z-TKR 4
X-TKR
– Supported off of its spacecraft (SC) mount brackets,
X-axis Accel
Z-TKR
Y-TKR
Y-axis Accel
XYZ-CAL
– +Z-axis point vertically up
Z-axis Accel
0
1
2
3
– LAT powered off during testing
Tri-axis Accel
Y-TKR
Y-TKR
XYZ-CAL
TKR (z = 640 mm)
Test sequence
X-TKR
X-TKR
CAL (z = -27 mm)
Z-TKR
Grid ( z = 0 mm)
– Excite LAT at two -X corners in the Z-direction, in phase
XYZ-Grid
XYZ-Grid
– Excite LAT at two -X corners in the Z-direction, 180 degrees out of
XYZ-Grid
XYZ-Mnt
XYZ-Mnt
phase—intended to excite LAT “potato chip” mode and other antiTKR, CAL, and Grid Accelerometer Placement
symmetric twisting modes
– Excite LAT at two -X corners in the X-direction, in phase—intended
XYZ-Elec
13
15
14
12
to excite LAT, ACD, TKR, and CAL lateral modes
MTY
MTY
MTY
EPU
– Excite LAT web crossings on either side of the Grid center from the
LAT
XYZ-CAL
XYZ-CAL
XYZ-CAL
+Y
underside—intended to excite LAT drumhead mode
11
10
9
8
SIU
Test levels
LAT +X
XYZ-Elec
XYZ-Elec
– TBD
GASU
PDU
7
6
5
4
X-axis Accel
– Levels will be set, based on
SIU
XYZ-Elec
Y-axis Accel
XYZ-CAL
pre-test analysis using asZ-axis Accel
XYZ-CAL
XYZ-CAL
measured damping
Tri-axis Accel
3
2
1
0
EPU
MTY
MTY
EPU
Elec (z = -500 mm)
coefficients for subsystems
CAL (z = -251 mm)
XYZ-Elec
Instrumentation
– High-precision
ACD
accelerometers mounted to
Accelerometer
CAL Bottom and E-Box Accelerometer
the LAT and test stand
Placement
Placement
Source: LAT-MD-01196-01, “LAT Dynamics Test Plan,” March 2003
Document: LAT-PR-01967
Section 14 Integration and Test
96
LAT +Z
LAT +Y
LAT +X
XYZ-ACD
ACD: outer surface
of honeycomb
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
EMI/EMC Tests
•
The I&T plan to implement the EMI/EMC
Test is in the LAT EMI/EMC Test
Performance Plan LAT-MD-01838.
• Configuration
– LAT will be integrated with EMI
skirt, X-LAT plates installed and
radiators not installed
• Applicable Documents
– LAT Environmental Parameters
Specification, LAT-SS-00778
– LAT Program Inst. Performance
Verification Plan, LAT-MD-00408
– MIL-STD-461E
– GSFC 433-RQMT-0005 (Draft)
• Actual test levels will be updated from
those shown
Document: LAT-PR-01967
Test
RE101
RE102
CE101
CE102
RS101
RS103
CS101
CS114
CS115
CS116
Description
Radiated
Emissions
Radiated
Emissions
Conducted
Emissions
Conducted
Emissions
Radiated
Susceptibility
Radiated
Susceptibility
Conducted
Susceptibility
Conducted
Susceptibility,
bulk cable
injection
Conducted
Susceptibility,
bulk cable
injection, impulse
excitation
Conducted
Susceptibility,
damped
sinusoidal
transients,
cables and power
leads
Range
20 Hz to 50 kHz
10 kHz to 18GHz
10 Hz to 10 KHz
10 kHz to 10 MHz
20 Hz to 50 kHz
2MHz to 40 GHz
30 Hz to 150 kHz
10 kHz to 200 MHz
-
10 kHz to 100MHz
Section 14 Integration and Test
97
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
EMI/EMC Testing Facility
•
•
•
•
•
EMI/EMC Testing will be performed at
the NRL facility
2 Chambers, GLAST is currently
scheduled to use the smaller chamber
19' clearance tip to tip on the cones
door 10.5' wide by 10' high, 0.5" rise
from exterior floor (minimal floor rise is
reason for selecting this chamber)
Capable of MIL-STD-461 testing up to 18
GHz RS, 40 GHz RE
Photo caption: Windsat @ NRL
And there is a bigger chamber.
Document: LAT-PR-01967
Section 14 Integration and Test
98
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Sine Vibration Test
•
•
•
•
The system level requirements are defined in
the LAT Dynamics Test Plan LAT-TD-001196.
The I&T plan to implement the Sine Vibration
Test is in the LAT Dynamics Test Performance
Plan LAT-MD-01836.
Instrumentation
– Accelerometers mounted to the LAT and
test stand, to cover the entire dynamic
range predicted for the LAT and
subsystems (LAT Instrumentation Plan,
LAT-MD-00890)
Specialized test equipment requirements
– The Vibe Test Stand must support the
LAT at the SC interface with flight-like
connections
– The Stand must allow for reconfiguration
to alternate axes, with the LAT attached,
to avoid unnecessary handling
XYZ-Mnt
XYZ-Grid
XYZ-Mnt
XYZ-Grid
XYZ-Grid
XYZ-TKR12
13
XYZ-TKR
14
XYZ-TKR
15
XYZ-TKR
9
XYZ-TKR10
11
XYZ-TKR
XYZ-CAL
8
XYZ-TKR
XYZ-TKR
LAT
+Y
LAT +X
XYZ-Grid
XYZ-CAL
XYZ-Grid
4
5
XYZ-TKR
6
XYZ-TKR
7
XYZ-TKR
X-axis Accel
Y-axis Accel
XYZ-CAL
Z-axis Accel
0
XYZ-TKR
1
XYZ-TKR
2
XYZ-TKR
XYZ-TKR 3
Tri-axis Accel
TKR (z = 640 mm)
CAL (z = -27 mm)
XYZ-CAL
Grid ( z = 0 mm)
XYZ-Grid
XYZ-Mnt
XYZ-Grid
XYZ-Grid
XYZ-Mnt
TKR, CAL, and Grid Accelerometer Placement
Source: LAT-MD-01196-01, “LAT Dynamics Test Plan,” March 2003
Document: LAT-PR-01967
Section 14 Integration and Test
99
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Sine Vibration Test
•
•
•
Configuration
– Fully integrated, except the Radiators are not installed
– Supported off of its spacecraft (SC) mount brackets, on the Vibration Test Stand
– The LAT is tested in all three axes, X, Y, and Z independently, requiring re-configuration between tests
– The LAT is powered off during sinusoidal vibration testing, and the EGSE cable harnesses removed
Test sequence
– X-Direction Sine Vibe
• Low-level vibration to verify that all instrumentation is operational
• Low-level random vibration signature of the entire frequency range
• Acceptance level sweep
• PFQ level sweep
• Low-level random vibration signature
• Limited Performance Test—re-connect E-GSE cabling; execute LPT while still on vibe test stand
– Y-Direction Sine Vibe
Qualification Sine Vibration Test Levels
• Low-level random vibration signature
Axis Freq. (Hz)
Test levels
Sweep Rate
• Acceptance level sweep
Thrust 5 to 7.4 1.27 cm (0.5 in.) double amplitude 24 octaves/min
• PFQ level sweep
7.4 to 50 1.4 g (zero to peak)
• Low-level random vibration signature
Lateral 5 to 6.2 1.27 cm (0.5 in.) double amplitude 4
2 octaves/min
– Z-Direction Sine Vibe
6.2 to 50 1.0 g (zero to peak)
• Low-level random vibration signature
LAT Sine Vibration Minimum
• Acceptance level sweep
Test Levels
• PFQ level sweep
Source: LAT-SS-00778-01, “LAT Environmental Specification,” March 2003
• Low-level random vibration signature
• Limited Performance Test—re-connect E-GSE cabling; execute LPT while still on vibe test stand
Test levels
– Levels will be established with pre-test analysis to 1.25 times the static-equivalent acceleration values,
without exceeding interface limit loads
Source: LAT-MD-01196-01, “LAT Dynamics Test Plan,” March 2003
Document: LAT-PR-01967
Section 14 Integration and Test
100
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Sine Vibration Test Facility
Testing will be performed at the NRL
Naval Center for Space Technology
Facility Capability
•
Four electrodynamic
shakers (one 40-klb,
one 30-klb, and two
18-klb)
•
Two slip tables
•
Three power
amplifiers
•
The 40-klb shaker
will be replaced with
a 50-klb unit ~ Nov
2003
•
LAT will use the 50klb unit
Photo caption: Coriollis during vibration testing @ NRL
Document: LAT-PR-01967
Section 14 Integration and Test
101
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Acoustic Test
•
XYZ-Mnt
XYZ-Grid
XYZ-Mnt
The system level requirements are defined in the LAT
Dynamics Test Plan LAT-TD-001196.
The I&T plan to implement the Acoustic Test is in the LAT
Dynamics Test Performance Plan LAT-MD-01836.
Configuration
– LAT is fully integrated, including the Radiators
– Mounted to STE using the flight-configuration bolted
joint
– LAT +Z-axis vertical, and with Radiators integrated to
the Grid as well as to the STE at the SC strut mount
points
– LAT is powered off during acoustic testing, and the EGSE cable harnesses removed
TKR, CAL, and Grid Accelerometer Placement
Instrumentation
– Accelerometers mounted to the LAT and test stand
(per LAT Instrumentation Plan, LAT-MD-00890)
LAT +Z
– Microphones mounted around the LAT
LAT +X
Specialized test equipment requirements
Y-axis Accel
– The Vibe Test Stand must support the LAT in the same
Tri-axis Accel
degrees of freedom as the SC flexures, to avoid overRadiator Inner Face
sheet
constraining the Grid and Radiators
– The STE fills the volume between the Radiators, so
Radiators Accelerometer Placement
must approximate the acoustic behavior of the SC
XYZ-Grid
XYZ-Grid
XYZ-TKR12
•
13
XYZ-TKR
14
XYZ-TKR
15
XYZ-TKR
9
XYZ-TKR10
11
XYZ-TKR
XYZ-CAL
•
8
XYZ-TKR
XYZ-TKR
LAT
+Y
LAT +X
XYZ-Grid
XYZ-CAL
XYZ-Grid
4
5
XYZ-TKR
6
XYZ-TKR
7
XYZ-TKR
X-axis Accel
Y-axis Accel
XYZ-CAL
Z-axis Accel
0
XYZ-TKR
1
XYZ-TKR
2
XYZ-TKR
XYZ-TKR 3
Tri-axis Accel
TKR (z = 640 mm)
CAL (z = -27 mm)
XYZ-CAL
Grid ( z = 0 mm)
XYZ-Grid
XYZ-Mnt
•
•
XYZ-Grid
XYZ-Grid
XYZ-Mnt
Source: LAT-MD-01196-01, “LAT Dynamics Test Plan,” March 2003
Document: LAT-PR-01967
Section 14 Integration and Test
102
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Acoustic Test
LAT Acoustic Test Levels
150
Acoustic Loading
Source: LAT-SS0077801, “LAT
Environmental
Specification,” March
2003
Sound Pressure Level (dB)
145
140
135
130
125
120
115
110
105
Accept Test (dB)
Qual Test (dB)
100
•
•
•
•
•
•
10
100
1000
10000
Test sequence
Frequency (Hz)
– Low-level acoustic to verify that all instrumentation is operational
and taking useful data
– Acceptance level test—ramp up sound pressure level (SPL) to AT
levels
– PFQ level test—ramp up SPL to QT levels
– Ramp down SPL and turn off
– TBD modal signature test
– Limited Performance Test—re-connect EGSE cable harnesses and
execute LPT
Test levels shown in LAT Environmental Specification
LAT will mount on a special stand to accommodate radiators. (TBD)
Support test stand will sit on floor of reverberant acoustic chamber
NRL chamber capabilities: sound pressure level of 153 dB through a range
of 32-10,000 Hz
Coriolis / Windsat system shown here on test stand
Photo caption: Coriollis/Windsat @ NRL
Document: LAT-PR-01967
Section 14 Integration and Test
103
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Thermal Balance/Thermal-Vacuum Tests
•
•
The system level requirements are defined in the LAT Thermal Test Plan LAT-TD-001600.
The I&T plan to implement the TBAL/TVAL Testing is in the LAT Thermal Test Performance Plan
LAT-MD-01837.
•
Configuration
– The LAT instrument will be fully integrated but the SC solar arrays will not be installed
– The LAT will be powered on and off during testing per the test procedure
– The LAT will be oriented with the Z-axis parallel to the ground to allow all heatpipes to operate and the +X axis
facing up
– All MLI blanketing will be in its flight configuration for the duration of the 2 tests
– The LAT will NOT be reconfigured after the thermal-balance test
Instrumentation
– Thermocouples and RTD’s will be used to instrument the LAT and test chamber
– LAT flight housekeeping instrumentation includes many thermistors and RTD’s. These will also be used for
monitoring temperatures within the LAT
Specialized test equipment requirements
– Chamber pressure of < 1 x 10-5 Torr
– Chamber cold wall temperature of –180 oC to provide a cold sink for accumulation of contaminants
– Thermally controlled surfaces in the chamber
• 5 plates for ACD surfaces, each individually controlled
• 2 plates for the radiators(one for each side), each individually controlled
• 1 plate to simulate the bus, controlling the environment to the X-LAT Plate and the back of each radiator
– Heat exchangers mounted on the + / – X sides of the LAT Grid, to increase ramp rate during transitions
– LAT heat pipes will be leveled to within 0.2 degrees
– 20 degC/hr max ramp rate
– Facility capable of holding LAT stable to < 2 oC/hr rate of change (TBR)
– Handling fixture to allow the transition from acoustic test to TVAC without breaking radiator configuration
•
•
Source: LAT-MD-01600-01, “LAT Thermal-Vacuum Test Plan,” March 2003
Document: LAT-PR-01967
Section 14 Integration and Test
104
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Thermal Balance/Thermal-Vacuum Test Profile
•
Dwell at high and low temps for 12 hours, min
•
Limited Performance Tests conducted during transitions
•
Comprehensive Performance Tests (C)
–
•
CPT test regime performed at ambient, during cold and hot soaks, and at return to ambient
Limited Performance Tests (L)
–
LPT test regime performed as indicated. Operating modes will be checked and units will be
monitored for failure and intermittent operation
Hot QT
Bake Out
CPT
CPT
LPT
LPT
CPT
Hot QT
LAT Off
Hot T- Bal
LAT Off
LAT On
Muon Survey
Warm-up
Repress
Pump-Down
Muon Survey
CPT
CPT
Cold
QT
Cold Surv
T-Bal
Cold T-Bal
1
2
3
4
Muon Survey
LAT On
LPT
LPT
CPT
Cold Start
T-Bal
Ambient Pressure, Temp
T-Vac Cycles
Pressure < 1x 10-5 Torr
Document: LAT-PR-01967
Source: LAT-MD-01600-01, “LAT Thermal-Vacuum
Test
March 2003
Section
14Plan,”
Integration
and Test
105
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Thermal Test Facility
•
NRL Naval Center for
Space Technology
A59 facility
•
Cryopumped chamber
•
16’ diameter x 30’ long
•
Support 200-300
thermocouples, ~400
other circuits
Document: LAT-PR-01967
Section 14 Integration and Test
106
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
LAT Support to Observatory
Supplemental
Appendix A
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
107
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT MGSE Used at Observatory
•
SpectrumAstro
•
– Transport Container
• Transport Container Cover Lift
Fixture
– LAT Lift Fixture
• Remove LAT from Transport
Container
• Attach LAT to SC
– GPR and Brackets to LAT
• Lifted Up and Over LAT After
Installation onto SC and Brackets
Removed
– Radiator Transport Container
• Radiator Lift Fixture (for removal
from shipping container)
– Rotation Stand
• May allow side by side testing
with SC prior to integration
– Thermal / Humidity Control Cart
(TBD)
– Grid mounted heat exchanger to
allow LAT to be run for long periods.
Document: LAT-PR-01967
Launch site
– Flight Preparation Operations in
Florida
• Nominal Operations
– No LAT MGSE Foreseen
– EGSE may be required to
check out LAT prior to Fueling
• Off-Nominal Operations – TBD
to None
• Thermal / Humidity Control
Cart (TBD)
– Operations at Canaveral AFS
• None Anticipated for SC to LV
Mate
Section 14 Integration and Test
108
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Contamination Control at Observatory
•
SpectrumAstro
– Conform to LAT Contamination Control
Plan, LAT-MD-00404
• Class 100,000 Clean Room and
Operations Protocol
• Helium Monitoring
– Protects ACD
– Concern about Helium use at SC
Integration Halls (to Counter Act
Gravity During Deployment Checks)
• Humidity Control, 30 to 45 % RH
– Protects Calorimeter
– Desiccant Cartridges while in
Transport Container
– Connected to Dry Air, or N2, Purge
Upon Removal from Transport
Container
» SC Vendor Provides Purge
(TBR)
» Thermal / Humidity Control
Cart (TBD)
Document: LAT-PR-01967
•
Launch Site
– Conform to LAT Contamination Control
Plan, LAT-MD-00404
• Class 100,000 Clean Room and
Operations Protocol
• Helium Monitoring
– Protects ACD
– Helium is typically used as Pressurant
for LV & SC Fuel Tanks
• Humidity Control, 30 to 45 % RH
– Protects Calorimeter
– SC Vendor Responsible for Transport
– Connected to Dry Air or N2 Purge Upon
Removal from Boeing Provided
Transport Container
» SC Vendor Provides Purge (TBR)
» Thermal / Humidity Control Cart
(TBD)
– LAT Requires Continuous Dry N2 Purge
up to Launch (TBR)
» Avoids Problems if Air
Conditioned Air Source
(Provided by Launch Site) Goes
Down
Section 14 Integration and Test
109
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Access Points at Observatory Level
• Spectrum Astro
– LAT Test Point prior to Installation onto SC
– LAT Test Point for Off-Nominal Check Outs After Integration
onto SC
– Radiator Installation Access TBD
– LAT to SC Interface Bracket Access TBD
– LAT Environmental Test Sensor Connections
• Launch Site, Processing
– LAT Test Point for Off-Nominal Check Outs
– Close of LAT Test Point before launch (Green Tag).
• Launch Site, On-Pad
– None
Document: LAT-PR-01967
Section 14 Integration and Test
110
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Particle Test Supplemental
Appendix A
Elliott Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
111
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Functional Performance (SE and I&T)
LATInstrumentPerformance
Verification Plan
LAT-M D-00408
T. Leisgang
SubsystemTest
Plans
Tracker Tower Test
Plan
LAT-TD-00155
LAT
Performance &
Operation Test
Plans
Com ponent
Aliveness Tests
Subsystem
IntegrationTests
ACD Test Plan
LATLim ited
Perform ance
Tests
ACD-PLAN-000050
LAT
Com prehensive
Perform ance
Tests
LATOperational
Perform ance Tests
ElectronicsTest
Plan
LAT-TD-00296
SUI
TEM
EP
PDU
GASU
E. Gawehn
E-GSE
LAT-M D-01533
M .Huffer
R. Claus
L. Wai
LAT Handling
&Transportation Plan
LAT-M D-00452
D-00649
LAT Contamination Control
LAT-M D-00404
Plan
J. Cullinan
E. Gawehn
M -GSE
LAT-M D-01462
LAT Instrumentation Plan
LAT-M D-00890
M .Lovellette
W. Davis
Facilities
LAT-M D-01386
LAT Survey & Alignment
L. Wai
LAT-M D-01586
LAT Survey Plan
LAT-TD-00895
L. Wai
M .Nordby
M echanical Weight & CG
LAT-M D-01598
E. Gawehn
L. Wai
Dynamics Tests
LAT-M D-01836
E. Gawehn
M .Lovellette
M echanicalS/S
Test Plan
LAT-SS-00493
LAT Flight Software
Test Plan
LAT-TD-00786
LATM echanicalIntegration
LAT-PS-00676
E. Gawehn
L. Wai
Calorimeter Test
Plan
LAT-SS-00262
Thermal S/S Test
Plan
No Number
LAT Integration & Test Plan
LAT-M D-01376
E. Bloom
LAT Dynamics Test Plan
LAT-M D-01196
Y Ismael
M .Lovellette
•Structural and Mechanical Tests
(cosmic ray survey)
• Thermal Verification Tests (cosmic
ray survey)
• Instrument Monitoring (cosmic
ray, Van de Graaff)
• End-to-end test (cosmic rays at ~
35,000 ft in a jet airplane during
transport to NRL for environmental
tests) (TBR)
ElectricalPerformance Tests
LAT-M D-01055
L. Wai
ThermalTests
LAT-M D-01837
M .Lovellette
E. Gawehn
LAT Thermal Test Plan
LAT-M D-01600
M .Lovellette
J. Wang
LAT EM I Tests
LAT-M D-01838
LAT EM I/EM C Test Plan
No Number
M .Lovellette
T. Leisgang
M .Lovellette
LAT SVAC Test Plan
LAT-M D-01587
E. do Couto E Silva
Particle Test Plan
LAT-M D-00440
G.Godfrey
Document: LAT-PR-01967
SVAC Plan
LAT-M D-00446
E. Do Couto E Silva
S. Ritz
Produce a
Working
Instrument
Section 14 Integration and Test
112
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Science Performance (SE, IS, and I&T )
LATPerformance Specification
(LevelIIb)
LAT-MD-00010
ACD Subsystem Spec.
Tracker SubsystemSpec
(levelIII)
CAL Subsystem Spec.
(levelIII)
LAT-MD-00016
LAT-MD-00017
LAT-MD-0018
(levelIII)
•
•
SVAC Plan
LAT-MD-00446
•
(levelIII)
E. do Couto e Silva
Particle Test Plan
LAT-MD-00440
(levelIV)
G.Godfrey
S. Ritz
Particle tests (beam test,
cosmic rays, Van de Graaff)
Calibration (beam test, cosmic
rays)
Science verification tests
(beam test, cosmic rays, Van
de Graaff)
LAT SVAC Test Plan
LAT-MD-01587
(levelIV)
E. do Couto e Silva
Engineering Model
Calibration Unit
LATIntegration
LAT-MD-00573
(levelIV)
LAT-MD-00574
(levelIV)
LAT-MD-0575
(levelIV)
E. do Couto e Silva
E. do Couto e Silva
E. do Couto e Silva
Document: LAT-PR-01967
LATEnvironmental
Tests
LAT-MD-00576
(levelIV)
E. do Couto e Silva
LAT Mission
Integration
LAT-MD-00577
(levelIV)
LAT Phase 0 OnOrbit
LAT-MD-0581
(levelIV)
E. do Couto e Silva
E. do Couto e Silva
Produce a
Scientifically
Working
Instrument
Section 14 Integration and Test
113
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Van de Graff Produced g Spectrum
Gamma Spectrum from P+Li7
170.57 200
Counts / .27 MeV
counts
i
150
counts_u
counts_d
FitCB E
i
In Crystal Ball detector
i
100
i
FitEM E
i
50
0
0
0
0
5
10
15
E
i
Energy [MeV]
20
25
30
26.73
1)
The points are data (3335 events) from the Crystal Ball for the gammas from the reaction p+Li7.
2)
The black solid curve is the sum of a Breit-Wigner (Eresonance =12 MeV , FWHM G=5 MeV) and a
Gaussian (Eresonance=17.6 MeV, G ~ 10 keV, resolution = 1.3 MeV). The two curves have equal area
and add up to the total number of counts in the data.
3)
The red solid curve is what the EM would see with the GLAST LAT required resolution, assuming a
sum of two Gaussians (= 50%, 50%, relative efficiency = 0.7, 1.0 ).
4)
The Li target produced 1060 Hz of gammas (E>7 MeV) into 4p solid angle (Measured in February
with the Van de Graff and BGO calorimeter in Bldg 33).
Document: LAT-PR-01967
Section 14 Integration and Test
114
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Absolute normalization of VDG Flux
•
VDG Absolute Flux needs to be known if VDG used to establish < 100 MeV
Science requirements.
– Required to establish > 300 cm2 effective area for LAT @ 20 MeV
(TBR)
• BGO normalization of the g flux during EM, CU, LAT Measurements
– The g angular distribution from the target is expected to be isotropic.
Measurements at 0 and 45 degrees have initially confirmed this.
– Primary normalization method: The BGO calorimeter will be placed
at ~135 degrees to the beam direction (i.e., behind the target) while the
target is in front of the EM, CU, or LAT. Simultaneously counting the
photons into the solid angle of the BGO will yield the number of
photons going into the solid angle of the EM, CU, or LAT.
– Secondary normalization method (less accurate): The Van de Graff
operator will keep the energy and current of the accelerator constant
during the run, and then use the flux versus current calibration to
calculate the number of photons going into the solid angle of the EM,
CU, or LAT.
Document: LAT-PR-01967
Section 14 Integration and Test
115
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
BGO Detector Array
Elements of
Scintillator
Telescope to
identify Cosmic
Rays.
BGO crystal array
used to calibrate
the energy of the
tagged photon
beam.
Phototubes
BGO crystals
Document: LAT-PR-01967
Section 14 Integration and Test
116
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Science Verification, Analysis,
and Calibration Supplemental
Appendix A
E. Bloom
I&T Manager
Document: LAT-PR-01967
Section 14 Integration and Test
117
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
SVAC Plans and Technical Documents
LEVEL III
LAT-MD-00446
Co-owned with Project Scientist
Hardware Test
Engineering Model
EM
LAT-TD-00570,1,2
I&T-SAS ICDs, EM, CU, LAT
Existing docs are shown in red boldface
SVAC Test Plan
Plan/Results
LAT-MD-00573
Calibrations
LAT-TD-01588
Simulations
Databases
Interfaces
LAT-TD-00582
LAT-TD-00578
LAT-TD-01340
LAT-TD-01593
LAT-MD-00574
LAT-TD-01589
LAT-TD-00583
LAT-TD-01590
SAS responsibility
LAT-TD-00578 LAT-TD-01340
LAT-TD-01594
LAT-MD-00575
LAT
Contributed Manpower Plan
LAT-MD-01587
LEVEL IV
Calibration Unit
CU
LAT-MD-00613
LAT-TD-00580 LAT-TD-01340
LAT-MD-00576
LAT-MD-00577
LAT-MD-00581
LAT-TD-01595
Document: LAT-PR-01967
Co owned with Instrument Operations Center
Section 14 Integration and Test
118
GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
Cost and Schedule
Supplementary
Appendix A
Brian Grist
I&T Engineer
Document: LAT-PR-01967
Section 14 Integration and Test
119
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Appendix B
Gamma-ray Large
Area Space
Telescope
Document: LAT-PR-01967
Peer Review RFAs
Section 14 Integration and Test
120
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFAs
Document: LAT-PR-01967
Section 14 Integration and Test
121
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFAs (Continued)
Document: LAT-PR-01967
Section 14 Integration and Test
122
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFAs (Continued)
Document: LAT-PR-01967
Section 14 Integration and Test
123
GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Peer Review RFAs (Continued)
Document: LAT-PR-01967
Section 14 Integration and Test
124