TIPS-JIM Meeting
18 March 2004, 10am, Auditorium
1.
Two Gyro Science Studies
George Chapman
2.
Cycle 13 Proposal Statistics
Brett Blacker
3.
The JWST ISIM SRR
Jerry Kriss
Next TIPS Meeting will be held on 20 May 2004.
Two-Gyro All-sky
Scheduling Study
TIPS
April 15, 2004
http://www.stsci.edu/org/ess/projects/two_gyro_science
Personnel at Large
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Special Projects Branch (SPB)
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Merle Reinhart
® George Chapman
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Operations Planning Branch (OPB)
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Alison Vick
® Ian Jordan
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Planning Systems Development Branch (PSDB)
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Mark Giuliano
® Bob Boyer
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Outline
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4/15/2004
Two Gyro background
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Two Gyro Modes
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Why they impact scheduling
All-sky scheduling study
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Plots galore
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Targets-by-week The Movie
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TGS Modes
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Three operational modes
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MSS and two gyros (M2G): Compares MSS output to magnetic field
model to control attitude and rates with errors required to be less than
10 degrees; supports vehicle maneuvers
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FHST and two gyros (T2G): Requires one tracker to be visible to use
FHST data and gyros to control rates; onboard attitude determination
(OAD) using FHST map data from two FHST units will bring attitude
error within FGS search radius
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FGS and two gyros (F2G): Requires FGS visibility to use FGS data
and gyros to control rates and attitude to allow for science
What does it mean?
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Elaborate process to get on guide stars after a slew
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Less schedulability (big surprise)
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3 gyro vs. 2 gyro
Getting to guided science
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3-gyro (current ops)
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Type 2 Slew
FHST full update
FGS guide star acquisition
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2-gyro
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4/15/2004
Type 2 Slew
FHST rate control
First FHST map
First attitude correction
Second FHST map
Second attitude correction
FHST GOB (overlaps with
guide star acq)
FGS Guide star acquisition
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TGS Scheduling Scenario
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Scheduling Impacts & Constraints
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Largest impact is the requirement to have overlapping visibility
between the FHSTs and FGSs
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Additionally, several constraints / restrictions are generically
affected by the large pointing uncertainty (LAU) in M2G mode
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Thermal off-nominal roll angles
Avoidance angles (Sun, Moon, Earth)
Solar array incidence angles
Solar array shadowing table
Anti-Sun avoidance / roll angles
10 degree LAU means
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4/15/2004
Limits the portion of sky available at any one time
Targets <60 degrees from sun will not be observable
An anti-sun avoidance zone of ~8 degrees radius develops
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The TGS All-sky Study
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Assess the availability of targets across the entire sky
under the FHST driven scheduling restrictions imposed
by two gyro mode
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Examine how that schedulability is affected by FHST
duration requirements and initial error estimates
4/15/2004
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All-Sky Study Approach
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5-degree-by-5-degree grid of targets covering 360 degrees in
RA and +85 degrees to -85 degrees in DEC
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Very schedulable Visit (one 30-minute exposure)
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Used updated (reduced) FGS earth avoidance angles
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Guide star availability not considered
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Used Prototype Long Rang Planning tool (SPIKE) to
determine constraint windows
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Summed the window durations by target
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Vary parameters and rerun
4/15/2004
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All-Sky Schedulability:
Three-Gyro 50°-180° Usable Sun Angle
4/15/2004
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All-Sky Schedulability:
Two-Gyro 60°-172° Usable Sun Angle
4/15/2004
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All-Sky Schedulability:
Two-Gyro 100°-172° Usable Sun Angle
4/15/2004
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All-Sky Schedulability:
Sky Availability
4/15/2004
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All-Sky Schedulability:
3-gyro vs. 2-gyro
4/15/2004
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All-Sky Schedulability:
Sensitivity to LAU
4/15/2004
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All-Sky Schedulability:
LAU difference distribution
4/15/2004
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All-Sky Schedulability:
Visit duration sensitivity
4/15/2004
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All-Sky Schedulability:
Visit difference distribution
4/15/2004
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All-Sky Schedulability:
Activity duration sensitivity
4/15/2004
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All-Sky Schedulability:
Onboard Attitude Determination difference
4/15/2004
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Target Availability
4/15/2004
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Scheduling under Two Gyro
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FHST / FGS overlapping visibility requirement creates the
most notable impact
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60 – 172 degrees usable sun angle
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Maximum off-nominal roll is 22 degrees
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Visit duration will likely be ~30 minutes
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On average an individual target is only observable ~120
days per year
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Low-dec targets become observable after the sun passes them
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Hi-dec targets have periodic availability tied to orbital precession
Can absorb small changes to the two gyro activities without
drastically affecting schedulability
4/15/2004
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All-Sky Schedulability:
OAD
4/15/2004
23
Cycle 13 Results
Summary from the
Science Policies Division
of the HST Cycle 13
Panel/TAC Deliberations
April 15, 2004
Cycle 13 Overview
◊ 949 proposals requesting:
⇒17,257 orbits
⊃Plus: 1714 [Cyc14] & 212 [Cyc15]
⇒5364 SNAP targets
⇒$10.1 M AR funding (including
Theory)
4/15/04
HST Cycle 13 Results
2
Executive Summary
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GO Acceptance Rate: ~1/5 for proposals and orbits
SNAP Acceptance rate: ~1/4 for proposals and orbits
AR Acceptance rate: ~1/3 for proposals and dollars
Acceptance rate is approximately independent of size.
34% of program awarded to Large/Treasury Programs.
Instrument breakdown for GO Programs: ACS (42%),
STIS (30%), NICMOS (19%), WFPC2 (9%), FGS (<1%)
◊ ESA acceptance fraction 18.8% for proposals and 15.7%
for orbits
4/15/04
HST Cycle 13 Results
3
Executive Summary Continued
◊ NOAO: 1 out of 15 proposals, or 4 nights out of 54
submitted
◊ Chandra: 2 out of 20 proposals, or 85 ksecs out of 1181
submitted
◊ Calibration: Both proposals approved for 2 Prime and 20
Pure Parallel orbits
◊ ToO’s: 1 ultra-fast (< 2 days) + 19 fast (< 2 week) + 15
other activations
◊ Very little future cycle orbits allocated
4/15/04
HST Cycle 13 Results
4
Notable Features
◊ Improvements to APT well liked by community
◊ Reviewers appreciated page limit changes
◊ CD went over extremely well: 1 out of 101
demanded paper!
⇒Saved effort, time and $$ for STScI
◊ Notifications sent on schedule
⇒Comments to follow: approved this week, rejected in
about 2 more weeks
◊ Cycle 14 planning already underway!
4/15/04
HST Cycle 13 Results
5
Summary Results
4/15/04
HST Cycle 13 Results
6
Over-subscription by Cycle
Approved Orbits and Proposals
by Cycle
Acceptance Fraction by Size
Triage Results
4/15/04
HST Cycle 13 Results
10
ESA Acceptance Fraction
4/15/04
HST Cycle 13 Results
11
Institutional Acceptance Fraction
4/15/04
HST Cycle 13 Results
12
Large/Treasury Programs
PI
Phase II ID
Title
Prime
Orbits
Parallel
Orbits
Brown
10265
The Formation History of Andromeda
107
107
Davis
10134
The Evolution and Assembly of Galactic Disks:
Integrated studies of mass, stars and gas in the
Extended Groth Strip
126
126
Filippenko
10182
Towards a Comprehensive Understanding of Type Ia
Supernovae: The Necessity of UV Observations
152
0
Howk
10151
Testing the Warm-Hot Intergalactic Medium Paradigm
130
0
Kulkarni
10135
Unveiling the Progenitors and Physics of Cosmic
Explosions
55
0
Malkan
10226
The NICMOS Grism Parallel Survey
0
280
Riess
10189
PANS-Probing Acceleration Now with Supernovae
270
0
Robberto
10246
The HST survey of the Orion Nebula Cluster
(Treasury proposal)
104
104
Song
10176
Coronagraphic Survey for Giant Planets Around
Nearby Young Stars
116
0
Silva
10222
The next generation spectral library
[450]
4/15/04
HST Cycle 13 Results
SNAP
13
GO Instrument Summary
4/15/04
HST Cycle 13 Results
14
Pure Parallel Instrument Summary
4/15/04
HST Cycle 13 Results
15
Snap Instrument Summary
4/15/04
HST Cycle 13 Results
16
4/15/04
HST Cycle 13 Results
17
Calibration Proposals
◊ 2 Proposals Submitted: 1 for 2
prime orbits and 1 for 20 pure
parallel orbits
⇒Both approved as requested
⊃ GO: 0059.ayres
0803.anderson
4/15/04
The Deep Lamp Project
Improving the Astrometric Calibration of
ACS/WFC for the Most Useful Filters
HST Cycle 13 Results
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Chandra Coordinated Proposals
◊ 20 GO Proposals were submitted for 377 HST Orbits and
1181 ksecs of Chandra time.
⇒ 2 were approved for 17 HST Orbits and 85 ksecs of Chandra time
⊃ 0214.barth
⊃ 0842.biretta
4/15/04
A Multiwavelength Study of POX 52, a Dwarf
Seyfert Galaxy with an Intermediate-Mass Black Hole
HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet
HST Cycle 13 Results
19
NOAO Coordinated Proposals
◊ 15 GO Proposals were submitted for 485
HST Orbits and 54 NOAO nights
⇒1 was approved for 104 HST Orbits and 4 NOAO
nights
⊃ 0473.robberto
4/15/04
The HST survey of the Orion Nebula Cluster
HST Cycle 13 Results
20
4/15/04
HST Cycle 13 Results
21
Targets of Opportunity
4/15/04
HST Cycle 13 Results
22
Orbit Size by Cycle
Future Cycle Allocations
◊ 26 Orbits allocated to Cycle 14 from 3
proposals
◊ 12 Orbits allocated to Cycle 15 from 1
proposal
4/15/04
HST Cycle 13 Results
24
Countries of PIs
4/15/04
HST Cycle 13 Results
25
States of PIs
4/15/04
HST Cycle 13 Results
26
Summary of the JWST
Integrated Science Instrument Module (ISIM)
and
Structural/Thermal Subsystem
Systems Requirements Reviews (SRRs)
Jerry Kriss
04/15/2004
TIPS/JIM
1/13
ISIM Overview
ISIM is:
• The JWST Science Instruments
• Associated Infrastructure: Structure, C&DH, & FSW
Region 1
Science Instrument Optics Assemblies
Near Infrared Camera (NIRCam)
Near Infrared Spectrometer (NIRSpec)
Mid Infrared Instrument (MIRI), & Dewar
Fine Guidance Sensor and Tunable Filter (FGS/TF)
Optical Bench Structure
Radiators and support structure (NGST supplied)
Region 2
Focal Plane Electronics (FPE)
Instrument Control Electronics (ICE, MCE, DCE)
Region 3
ISIM Command & Data Handling (C&DH) Electronics
FGS C&DH Electronics
04/15/2004
TIPS/JIM
2/13
JWST System Constituents
System
System
JWST System
Segment
Segment
Observatory
Ground
Launch
Element
Element
Optical Telescope
Element (OTE)
Science and
Operations Center
Launch
Vehicle
Spacecraft (SC)
Institutional Systems
Payload Adapter
Integrated Science
Instrument Module
(ISIM)
Common
Systems
Launch Site
Services
NIRCam
Subsystem
Subsystem
(within
(within ISIM)
ISIM) Structure
04/15/2004
NIRSpec
MIRI
FGS/TF
Thermal
IC&DH
Flight SW
TIPS/JIM
Harnessing
3/13
JWST Requirements Tree
Baselined
In CM Review
Drafts Available
Allocation Documents
JWST Program Plan
JWST-PLAN-000633 L1
Program
System
FGS SRD
JWST Science
Requirements Document
JWST-RQMT-002558SR
NIRCam SRD
NIRSpec SRD
JWST Mission
Requirements
JWST-RQMT-000634 MR
JWST Performance
Assurance Requirements
JWST-RQMT-000650 PA
JWST Mission Operations
Concept Document
JWST-OPS-002018 MOC
FGS OCD
MIRI SRD
Budgets
WFE Rev Q 03-JWST-0405
Efficiency
Pointing
WFS&C Requirements
Allocation Document
JWST-RQMT-002017 WFS
NIRCam OCD
EMC Control Plan
JWST-PLAN-002449
NIRSpec OCD
EMC
Performance Quality
Assurance Plan
JWST-PLAN-002412
Contamination Control
Plan
JWST-PLAN-002028
CCP
PQ
MIRI OCD
Segment
Flight Observatory to
Ground Segment IRD
JWST-IRD-000696 FG
Ground Segment
Requirements
JWST-RQMT-001056
GS
JWST Observatory
Specification
JWST-SPEC-002020
RD
Launch Segment
Specification
JWST-SPEC-001999
OL
OBS
JWST-ICD-001998 FGC
Radiation Requirements
Allocation Specification
JWST-SPEC-000871
Observatory to Launch
Segment IRD
JWST-IRD-002000
JWST System
Verification Plan
JWST-PLAN-002027
LS
JWST-ICD-002001
OLC
Environmental Req’s
for the JWST Observatory
JWST-SPEC-003149 EV
Observatory I&T Plan
JWST-PLAN-002030
Observatory to
GSE IRD
D36127 OG
D36128 OGC
Fault Protection
Requirements Document
JWST-RQMT-002450
FP
Element
ISIM Requirements
Document
JWST-RQMT-000835
ISIM
ISIM to OTE and
Spacecraft IRD
JWST-IRD-000640
ISIM to OTE and IOS-IR
JWST-ICD-001831
04/15/2004
SC Requirements Document
JWST-RQMT-002039
SC
Spacecraft to OTE
ICD
D35231 SOIC
OTE Specification
JWST-RQMT-002021
OTE
IOSC
TIPS/JIM
4/13
ISIM SRR Objectives
Confirm that ISIM-level requirements meet the mission
objectives.
Validate that the ISIM architecture concept can support the
functional, operational, interface and performance
requirements.
Confirm that the preliminary system design is ready to
proceed.
04/15/2004
TIPS/JIM
5/13
Requirements Traceability
•L1-1 Density of Galaxies, L1-2 Spectra of Galaxies
•SR-4 Diffraction-Limited imaging 2.0 mm-27 mm, SR-5 Short-l
image quality: ~75% @ 150 mas @ 1 mm, SR-21 Sensitivity
MRD Appendix A
MR-51
SNR equations, conditions,
and assumptions
The observatory system shall be capable of
reaching the sensitivity performance levels
shown in the following table when observing a
position on the celestial sphere that exhibits 1.2
times the minimum Zodiacal light background
power.
Current draft:
JWST-MEMO-002852
JWST-TM-002876
JWST-TM-002877
JWST-TM-002878
Sensitivity
KEY OTE/SC REQUIREMENTS
Transmission: MR-211
Image quality: MR-110,111,228
Stray light:
MR-121,122
Collecting area: MR-198
Observatory Specification: OBS-67
Allocation
ISIM Requirements
Sec 3.7.1
ISIM Requirements
Section 3.2
ISIM Requirements
Sec 3.7.2
ISIM Requirements
Sec 3.7.3
ISIM Requirements
Sec 3.7.4
NIRCam FRD
NIRSpec FRD
MIRI FRD
FGS-TF IPFRD
Derived sensitivity for
each operating mode
Derived sensitivity for
each operating mode
Derived sensitivity for
each operating mode
Derived sensitivity for
each operating mode
20% allocated margin
20% allocated margin
20% allocated margin
20% allocated margin
04/15/2004
TIPS/JIM
6/13
Open Trade Studies
Pupil Imaging Lens in NIRCam
• Concluded in favor of including a pupil imaging lens.
OTE/ISIM Mechanical Interface
• Concluded in favor of mounting the ISIM to the OTE BSF.
ISIM Decontamination
• Concluded in favor of preventing contamination by managing cooldown.
Reheating ISIM and instruments rejected as an option.
MIRI Dewar
• Baseline is dual solid hydrogen dewar w/ tactical cooler on the pad.
• To be concluded after dewar contractor selected.
ISIM Electronics Compartment (IEC) Accommodation
• Outstanding mass and thermal problems. TBD by 8/2004.
OTE Simulator (OSIM)
• To be concluded by mid-summer
04/15/2004
TIPS/JIM
7/13
Key Issues & Challenges
MIRI SRR
• Delta-SRR successfully accomplished 9 March 2004
• Demonstrated proper Requirements flowdown
• Answered all RFAs
Instrument Electronics Accommodations Trade
• Lacking Observatory architectural solution to housing ISIM electronics that
meets all thermal, structural, and electrical performance requirements
• Trade study underway to develop new concept for electronics compartment
• Goal to keep all Instrument electronics boxes in Region 2
• Planned completion date July 04
System Mass
• Observatory Mass Budget has only 9% unallocated reserve
• Estimates currently exceed allocations
• ISIM allocation includes growth contingency
• Tracking SIs and Subsystem mass estimates and contingency usage monthly
• Mass evaluation and reallocation (if necessary) in September following:
• Conclusion of IEC Trade Study
• Conceptual Design of MIRI Dewar
04/15/2004
TIPS/JIM
8/13
Work In Progress
Sensitivity
• Mission Rqmts Document and Observatory Spec update required to reflect
current OTE and Instrument designs.
Focus and Pupil Shear Budgets
• Tentative agreement; CCRs to Interface Rqmts Docs in process.
Accommodation of NIRCam non-common-path Wavefront Error
• Methodology defined; CCRs to Instrument Interface Rqmts Docs in process
Coronagraphy
• Existing Level 1 Requirement for Coronagraphy to be flowed to lower level
requirements documents (Mission −> Observatory −> ISIM)
• NIRCam, MIRI, and FGS/TF concepts already include coronagraphy
Stray Light and Thermal Emissions Budget
• Working group defining format and allocations for flowdown of Mission-level
requirement
04/15/2004
TIPS/JIM
9/13
Plans to ISIM SDR
Complete Trade Studies
Key Procurements
• Select NIRSpec Contractor Team
• Select MIRI Dewar Manufacturer
• Select Structure Manufacturer
• Select Single Board Computer Supplier
Documentation
• Complete CCB Process for:
• ISIM, SI, and ISIM Subsystems Requirements Documents
• Flight and ETU ISIM Integration and Test Plans
• MIRI, NIRSpec, FGS Joint Project Implementation Plans
• Develop drafts of:
• SI Interface Control Documents
Achieve TRL6 for Detector Technologies
Complete Instrument and Subsystem SRRs and PDRs
04/15/2004
TIPS/JIM
10/13
ISIM SRR Summary Results
The board thought that the review was excellent.
23 Requests for Action (RFAs) generated.
Major issues raised by the review board:
• ISIM urged to speed up I&T timeline to meet up with OTE Pathfinder
at Plumbrook.
• Worried about piecemeal approach to contamination control.
• Worried that redundancy and cross strapping is being done to excess,
without careful thought.
• The connection with Ariane Space is still missing, and it can affect
many requirements.
• Desire to make several of the ISIM FSW rqmnts less vague and more
verifiable.
• Need to do a better flow down of the efficiency rqmt and tie it in to
data quality and reliability in a more comprehensive way.
• Fault handling requires more development.
04/15/2004
TIPS/JIM
11/13
Structural/Thermal Subsystem SRR
Structure
• Provides kinematic interface to Optical Telescope Element
• Supports Instrument Optical Assemblies and maintains alignment
• Composite carbon-fiber (M55J) construction with metal (Ti) fittings
Structural system risks:
• Thermal distortion at cryogenic temperatures.
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Mitigation: Math Model Development plus test program.
• Metal-composite joint survivability.
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Mitigation: early and extensive test program.
Thermal Control Subsystem
• Maintains thermal environments for instruments, structure, and electronics
• Heat Straps, Thermal Switches, MLI, Heaters, & Sensors
• Heat straps connect to radiators for passive cooling
(radiators are NGST-provided)
• MIRI dewar is provided by MIRI/JPL
Thermal system risks:
• Managing cool down so that it is rapid enough to enable commissioning
within the first 6 months.
• Managing relative thermal profiles to avoid contamination.
04/15/2004
TIPS/JIM
12/13
Structural/Thermal SRR Summary
Review was successful.
~20 RFAs generated.
Major concern of the panel:
• Little/no flight history for cryogenic applications of composite
structures, especially composite joints.
• Urged an even more aggressive and earlier testing program than
described by the team.
04/15/2004
TIPS/JIM
13/13