GLAST LAT Project
I&T Review, April 16, 2002
Integration and Test Organization Chart
I&T&C Manager
Elliott Bloom
WBS 4.1.9
I&T Engineer
B. Grist
WBS 4.1.9.1
Reliability & QA
D. Marsh
WBS 4.1.9.2
Instrument Operations
Coordinator
S. Williams
Mechanical Ground
Support Equipment
TBD
Online Manager
R. Claus
Integration, Facilities,
Configuration, and Test
L. Wai
Particle Test Manager
G. Godfrey
Environmental Test
Manager
M. Lovellette
E. do Couto e Silva
I&T Preparation 4.1.9.3
I&T Preparation 4.1.9.3
EM1 Model I&T&C
EM1 Model I&T&C
EM1 Model I&T&C
Calibration Unit I&T 4.1.9.4
Calibration Unit I&T 4.1.9.4
Calibration Unit I&T 4.1.9.4
Flight LAT I&T 4.1.9.6
Flight LAT I&T 4.1.9.6
Flight LAT I&T 4.1.9.6
Flight LAT I&T 4.1.9.6
Mission I&T Support 4.1.9.7
Mission I&T Support 4.1.9.7
Mission I&T Support 4.1.9.7
Mission I&T Support 4.1.9.7
E. do Couto e Silva
I&T Preparation 4.1.9.3
Science Verification,
Analysis, and Calibration
I&T Preparation 4.1.9.3
1
GLAST LAT Project
I&T Review, April 16, 2002
SVAC People
Department Manager
•
Eduardo do Couto e Silva - scientist - off project
Alignment and Monte Carlo Simulations
•
Hiro Tajima - scientist - off project
•
Garima Sahai - graduate student – off project
•
Navneet Aron - graduate student – off project
Software development and overall support
•
Xin Chen - software developer - on project
Database
•
Ashmi Chokshi - graduate student - off project
•
Jian Zhong - graduate student - on project (summer only)
EGSE interface
•
E. do Couto e Silva
Alicia Kavelaars - graduate student - off project
2
GLAST LAT Project
I&T Review, April 16, 2002
Science Verification, Analysis and Calibration (SVAC)
System
Level II
Levels III and IV
Science Requirement Document
443-SRD-00010
LAT Performance Specifications
LAT-SS-00010
ACD, CAL, TKR Specifications
APPROVED
and
SIGNED !
GLAST LAT SVAC Plan
LAT-SS-00016, LAT-SS-00017
LAT-SS-00018, LAT-SS-00152
LAT-SS-00152,LAT-SS-00210
LAT-MD-00446
•Mission deliverable
•Basis of all SVAC work
Science Verification
E. do Couto e Silva
Data Analysis
Calibration
3
GLAST LAT Project
I&T Review, April 16, 2002
SVAC Overview
Instrument
Calibrations
EM
Instrument
Calibrations
CU – Beam Test
Instrument
Calibrations
LAT
I&T Flow
Prototype
calibration tools
and procedures
MC Validation
CU- Beam Test
Science
Verification
CU - Beam Test
Instrument
Calibrations
LAT – Environmental test
SVAC
Calibration
Products
SAS
Instrument
Response
Functions
Calibrated
LAT
Instrument
IOC
On orbit
Calibrations
E. do Couto e Silva
4
GLAST LAT Project
I&T Review, April 16, 2002
SVAC System Responsibilities
•
Capture Science and Calibration requirements from Subsystems Plans
•
Prepare the SVAC plan (with continuous review from subsystems)
•
To verify Science and Calibration Requirements
•
Provide the final I&T calibration products to SAS and IOC
•
Develop Calibration Compliance Matrices for pre and pos launch
operations
•
Coordinate Data Analysis (with support from subsystems) using data
obtained from particle beams and cosmic rays during LAT assembly,
environmental, airplane 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
E. do Couto e Silva
5
GLAST LAT Project
I&T Review, April 16, 2002
SVAC Input Data
SVAC data come from tests on several hardware units
at different stages during the LAT integration
Hardware Units
(delivered by subsystems)
• Engineering Model (EM1)
1 tower
• Flight Modules (FM )
1 tower
• Calibration Unit (CU)
4 towers
• LAT
16 towers
E. do Couto e Silva
Particle Tests
(managed by I&T Particle Tests – G. Godfrey)
• Cosmic Ray Tests
EM1, FM, CU, LAT
• Particle Beam Tests
CU
• Environmental tests
LAT
• Airplane tests
LAT
• Spacecraft Integration
LAT
6
GLAST LAT Project
I&T Review, April 16, 2002
SVAC Timeline
2003 Engineering
Model 1
Low and High Level calibrations
Prototype algorithms and database
Prototype interface with EGSE and SAS
2004 Calibration
Unit
Science Verification (Monte Carlo Validation)
Low and High Level calibrations (inter tower alignment)
Validation of SVAC database design
Validation of on-orbit low level calibration scheme
2004 LAT
2005
E. do Couto e Silva
Final alignment
Validation of on orbit calibration scheme
Calibration dependence on environment
Calibration time history prior to launch
7
GLAST LAT Project
I&T Review, April 16, 2002
Developments since PDR Review - I
Organization
•
SAS/SVAC - Host joint calibration meetings between SAS and I&T
•
reference datasets - Now meeting with Italian collaborators to discuss
interface for reference calibration datasets for the Engineering Model
Documentation
•
SVAC Plan – LAT-MD-00446 - approved and signed, it is the basis of the
developments within SVAC. Includes validated list of calibrations.
•
ICD with SAS – LAT-SS-00570 - approved and signed, SAS is the main
interface for SVAC. Defines interface for FY02 activities
•
SVAC Plan for the EM – LAT-MD-00530 - draft being reviewed, it is the
basis of the developments of SVAC activities for the Engineering model.
Alignment and Monte Carlo (MC) Simulations
•
Alignment - Preliminary results on alignment using the Balloon Flight
Engineering Model data. Alignment Plan now under development.
•
MC for beam test– Preliminary results for photon distributions for the
Calibration Unit beam test (will be used to confirm estimated run time)
•
Low Energy Photons - currently studying energy distributions for the EM
E. do Couto e Silva
8
GLAST LAT Project
I&T Review, April 16, 2002
Developments since PDR Review - II
Software development and overall support
• Old Simulation (pdrApp) - implemented infrastructure for generation of simulated
events at the SLAC linux farm for current studies
• New Simulation (GLEAM) - studying new software code from SAS for MC
simulations (NT) and participating in SAS code reviews.
• Geometry for Simulation – developed documentation scheme in conjunction with
SAS. Now preparing documentation and implementation of EM geometry.
Database
•Client and server software - developed, implemented and tested a prototype database
concept
•Table schema – currently developing table schema for the Engineering Model using
Calorimeter as prototype
EGSE interface
•Data format - being handled now by Online
•EGSE scripts – Started discussions with IFCT to inherit EGESE scripts that may be
needed for calibration
E. do Couto e Silva
9
GLAST LAT Project
I&T Review, April 16, 2002
Impact from schedule changes
Engineering Model activities
•
No significant impact
CDR
•
Will have more time to prepare for CDR
Calibration Unit activities
•
E. do Couto e Silva
Delayed preparation of final drafts of documentation (since it is too
early to capture correctly all requirements)
•
ICD with SAS is ready for signatures, but this delay implies that
the ICD will have to be revisited some months later.
•
Delayed beginning of some activities related to new Monte Carlo
Simulations.
10