GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 1 GLAST Large Area...
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Transcript of GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 1 GLAST Large Area...
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 1
GLAST Large Area Telescope:GLAST Large Area Telescope:
LAT System EngineeringWBS 4.1.2
Dick HornSLACSystem Engineering Manager
[email protected] 926-8578
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 2
Topics
• LAT System Engineering Overview – D. Horn– Design Review Summary
– Key System Performance Metrics
– Configuration Management And Technical Baseline
– Risk Management
– Cost & Schedule Summary
• Requirements, Traceability & Interfaces
• System FMEA/PRA/Reliability T. Thurston
• System Verification T Leisgang
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 3
LAT System Engineering Overview
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 4
Design Maturity Summary
Fiscal Years
2000 2001 2002 2003 2004 2005 2006 2011
BeginLAT I&T
CriticalDesignReview
PDR PER
PreShipReview
LAT ReadyFor S/C I&T
FABRICATION PHASE COMMISSIONINGPHASE
Build & TestFlight Units
ObservatoryI&T
Final DesignEngr’g Models
LAT I&T
Ops.
Prelim. & Sys. Design
PDR Delta Baseline Review Subsystem CDR
Peer ReviewsSRR
Mature & Stable Requirements Since SRRInterfaces With Spacecraft Established and Reflected in CDR Design
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 5
PDR & dPDR, Peer Review RFA Closure• PDR RFA’s Submitted, xx of 57 Closed
– Working with GSFC on residual issues:• Calorimeter to grid attachment
• EMI/EMC box level acceptance test
• dPDR RFA’s Submitted, xx of 20 Closed– No design drivers identified
– LAT Initial responses under review by GSFC
• Subsystem CDR Peer Review RFA’s
Subsystem Number Of RFA’s
Status
ACD 19
Calorimeter 30
Electronics/FSW 26
Tracker 39
Mechanical 48
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 6
LAT Mass Status
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 7
LAT Power Status5-Apr-03 Estimate PARA CALC MEAS Recm'd Reserves
Item (Watts) (Watts) (Watts) (Watts) (Watts) %
ACD 9.4 2.3 3.9 3.2 1.4 15.0%
Tracker 152.4 1.5 0.0 150.9 10.8 7.1%
Calorimeter 64.9 0.0 0.0 64.9 4.6 7.1%
Trigger & Data Flow 326.2 211.5 114.7 0.0 23.3 7.1%
Grid/thermal 20.4 20.4 0.0 0.0 3.1 15.0%
Instrument Total 573.3 235.7 118.5 219.0 43.1 7.5%
Instrument Allocation 650.0
% Reserve 13.4%LAT Power
400
450
500
550
600
650
700
06-Jan-99 06-Jan-00 05-Jan-01 05-Jan-02 05-Jan-03 05-Jan-04 04-Jan-05 04-Jan-06 04-Jan-07 04-Jan-08
Po
wer
- W
atts
PDR7/30/02
I
CDR5/1/03
I
PSRR9/05
IGoals estimated using guidelines given in ANSI/AIAA G-020-1992 "Estimating and Budgeting Weight and Power Contingencies for Space Craft Systems"
PDR Reserve Was 15.2%
Goal for CDR Reserve > 10%Goal for PSRR Reserve > 5%
PARA - Best Estimate based on conceptual design parametersCALC - Estimate based on Calculated power from detailed design documentationMEAS - Actual power measurements of components
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 8
FSW Resource Usage Current Estimates
Resource Total Available Anticipated
Usage
Margin Factor
EPU Boot PROM 256 kB 128 kB 2
SIU Boot PROM 256 kB 128 kB 2
EPU EEPROM 4 MB 1.5 MB 2.7
SIU EEPROM 8 MB 1.5-2.5 MB 3-5
EPU CPU cycles 200% in 2 EPUs 30% > 6
SIU CPU cycles 100% in 1 SIU 25% 4
EPU memory 128 MB 16-32 MB 4-8
SIU memory 128 MB < 16 MB 8
Bandwidth – instrument to EPU 20 MB/sec 5 MB/sec 4
Bandwidth – EPU or SIU to SSR 5 MB/sec 40 kB/sec 112
Bandwidth – CPU to CPU 2.5 MB/sec 20 kB/sec 125
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 9
Key Science Performance Metrics
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 10
Configuration Management
GLAST Project Office433-PROC-0001
LAT ConfigurationManagement
LAT-MD-00068-01
Spectrum Astro
TrackerSLAC/UCSC
LAT-MD-00068-01
ACD/GSFCLAT-MD-00845-01
CAL/NRLLAT-MD-01486-01
LAT CM
Major Supplier CM
Italy France
LAT CM Defined By LAT MD-00068-01• Major Supplier CM defined internally• Key Subsystem Doc CM Transferred to LAT CM upon Subsystem Delivery to LAT
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 11
Management Plans
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 12
Change Control Process
Impact to requirements, cost,
schedule?
NO Need for Change
Identified
Level 4 change. Change is implemented and
DCN is distributed to LAT team.
RPE submits Change Request (CR) for manager approval.
YES
Level 2 or 3 change. RPE submits a Change Request
(CR) for CCB screening.
CR is sent to the Configuration Control Board for approval.
GSFC approval required?
YES, Level 2
CR is sent to GSFC for approval.
If approved, the change is implemented and the CR and DCN
are distributed to the LAT team.
NO, Level 3
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 13
Change Control Thresholds
Technical2 Cost3 Schedule4 Mass5 Power5
Level 16 And higher
As described in the DOE Project Execution Plan and the GLAST Mission Project Management Plan.
Level 26 DOE LAT Federal Project Manager
AND
NASA/GSFC GLAST Project Manager
Changes affecting any mission (level 2) requirement
Changes to any subsystem (level 3) allocation >$500K, or any change which causes the estimate at completion to exceed $110M
Changes which delay any level 2 or higher milestone
Changes to any subsystem (level 3) allocation which cause the total allocated mass to exceed the following thresholds:
Before PDR: 2725 kg Before CDR: 2850 kg Before launch: 2960 kg
Changes to any subsystem (level 3) allocation which cause the total allocated power to exceed the following thresholds:
Before PDR: 550 W Before CDR: 600 W Before ship: 625 W Before launch: 650 W
Level 36 LAT Project Manager
Changes affecting any LAT subsystem (level 3) requirement
Changes to any subsystem allocation; any changes > $50K
Changes which delay any level 3 milestone
Changes to any subsystem allocation
Changes to any subsystem allocation
Level 47 LAT Subsystem Manager
All changes to controlled documentation not affecting level 3 requirements
Any level 4 change <$50K which doesn’t increase subsystem cost
Any change not affecting level 1, 2, or 3 milestones
Any change within the subsystem level 3 allocation
Any change within the subsystem level 3 allocation
1 Any change to LAT baseline meeting the criteria listed in any row requires the 5 Appendix D approval of the person(s) identified in the first column 6 Level 1, 2 or 3 change requests require LAT CCB approval 2 Appendix A 7 Level 4 Cost or Schedule change requests are recorded in the 3 Appendix B Change Request log and captured in the PMCS, but require no additional 4 Appendix C review Figure 7: LAT Change Control Thresholds (from Project Management Plan LAT-00054-08)
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 14
Risk Management
Project Team Assessments
Expert Interviews
Lessons Learned
FMEA/FTA
Consolidation by PRM
Cost vs Effectiveness
Development of Mitigation
Strategy
Review by Risk Review Board
Risk Information Database
Risk Assessment
Networked Schedules
Fault Trees/Event
Trees
Monitoring of Project
Performance by
Managers/Risk Review Board
Review by Risk Review Board
Mitigation Activities
Corrective Action
RiskInformation Database
(Watch Lists, Contingency
Plans)
TPM Charts
Networked Schedules
Work Accomplished
Performance Margin
Risk Identification
Risk Analysis
Risk Planning,Mitigation
and Tracking
LAT Risk Management Defined By LAT-MD-00067-03
• Parallel Process To GSFC ….• Continuous Process Across LAT• Risk Ranked By Probability and Impact to Technical, Cost & Schedule
Low Risk (Selected Mitigation)
Moderate Risk (Selected Mitigation)
High Risk (Mitigation Required)
Risk Ranking
5 13 16 19 22 254 11 14 17 20 233 9 12 15 18 212 7 10 13 16 191 5 8 11 14 17
1 2 3 4 5Probability
Impa
ct
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 15
Top Risks
ID # Risk Rank
Risk Description Risk Mitigation Mitigation Status
Moderate
• On track
Moderate
• On track
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 16
System Requirements , Traceability & Interfaces
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 17
Specification Tree
LAT EnvironmentalSpecification
LAT-SS-00778
Mission SystemSpecification
433-SPEC-0001
ScienceRequirements
Document433-SRD-0001
LAT-SC InterfaceRequirements
Document433-IRD-0001
LAT PerformanceSpecification
LAT-SS-00010
LAT IOCPerformanceSpecification
LAT-SS-00015
ACD SubsystemSpecification
LAT-SS-00016
TKR SubsystemSpecification
LAT-SS-00017
CAL SubsystemSpecification
LAT-SS-00018
Trigger & DataflowSubsys.
SpecificationLAT-SS-00019
SASSubsystem
SpecificationLAT-SS-00020
LOFSubsystem
SpecificationLAT-SS-00021
PowerSubsystem
SpecificationLAT-SS-00136
MechanicalSubsystem
SpecificationLAT-SS-00115
Mis
sio
nL
AT
LA
T S
ub
syste
m
ScienceRqmts
MissionRqmts
Interface Rqmts
Interface Rqmts
TCS PerformanceSpecification
LAT-SS-00715
SAS DesignSpecification
LAT-SS-00505
CAL DesignSpecification
LAT-SS-00210
LAT TriggerSpecification
LAT-SS-00284
LAT TKR DesignSpecification
LAT-SS-00134
LAT OperationsFacility
SpecificationLAT-SS-01783
Tower PowerSupplies
SpecificationLAT-SS-01537
ACD DesignSpecification
LAT-SS-00352
Desig
n
Sp
ecif
icati
on
LAT DataflowSpecification
LAT-SS-00285
LAT Flight SWSpecification
LAT-SS-00399
LAT ReadoutElectronic
SpecificationLAT-SS-00152
Radiator DesignSpecification
LAT-SS-00394
X-LAT PlateDesign
SpecificationLAT-SS-01240
Grid Box DesignSpecification
LAT-SS-00775
LAT-SC InterfaceControl
Documents
Mission GroundSystem
RequirementDocuments
LAT IOC/MOC/SSC Interface
ControlDocuments
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 18
Requirements Development
Level 2 Reqts Peer Reviews (Aug. 2000)
Level 2 Reqts placed under LAT CM
LAT System Requirements Review (Sep. 2000)
Level 3 Reqts Peer Reviews (Mar.-Apr. 2001)
Level 3 Reqts placed under LAT CM
Level 4 Reqts developed by subsystems
Preliminary Design Reviews (Jan. & Jul. 2002)
Level 4 Reqts placed under subsystem CM
Line-by-line reviews of LAT and IOC Performance Specs by Subsystem Mgrs, Engineering and Science Leads
Updates require approval of LAT change control board
Top-level subsystem performance requirements were reviewed by Subsystem Mgrs and LAT Engineering and Science Leads
Updates require approval of LAT change control board
Subsystem design specifications are controlled at the subsystem level.
Level 4 requirements are managed and tracked at subsystem level.
CCB changes, document updates and test planning
Critical Design Review (May 12-16, 2003)
Reqts. docs imported and linked in DOORS
Reqts. in DOORS linked to planned tests and analyses.
Impacts from changes are flowed up or down as they are identified.
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 19
Requirements Traceability and VerificationExample of Flowdown from Science Requirements
Science R equirem ents D ocum entE ffective A rea
T racker Leve l 3 SpecificationLAT -SS-00017
LAT Level 2(b) SpecificationLAT -SS-00010
5.2.3 Peak E ffective A rea
AC D Level 3 SpecificationLAT -SS-00016
5.6 M ean T hickness
5.8 False VET O due to E lectrica lN oise
C alorim eter Level 3 SpecificationLAT -SS-00018
5.9 Low Energy T rigger S ignal
E lectron ics Level 3 SpecificationLAT -SS-00019
5.2.7 L1 T rigger D ead-tim eC ontribution
5.4.10 Event D ataflow D ead-T im e for Average O rb ita lC onditions5.11.2 Fast VET O S ignal
Latency
5.11.3 Logic VET O S ignal
5.11.4 Logic VET O S ignalLatency
5.11.5 Logic VE"T O S ignalT im ing
5.11.6 Fast VET O S ignal W idth
5.11.7 Fast VET O R ecoveryT im e for Large S ignals
5.11.9 AC D T rigger P rim itives
5.2 G am m a R ay C onvers ionE ffic iency
5.3 C onverter C onfiguration
5.5 G eom etric A rea
5.11 Self T rigger
5.12 D ata N oise O ccupancy
5.13 D ead T im e
5.10 H igh Energy T rigger S ignal
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 20
Requirements Traceability and VerificationEffective Area Requirement Flowdown
Effective Area > 8,000 cm2
Maximum (as function of energy) effective area at normal incidence. Includes inefficiencies necessary to achieve required background rejection. Effective area peak is typically in the 1 to 10 GeV range.
Verification5.2.3 The Peak Effective Area of the LAT shall be greater than 8000 cm2. SVAC Plan Measurement
S1 Fraction of Reconstructed Photons (Effective Area)
Verification5.6 The ACD, support structure, and micrometeorite shield shall absorb less than 6% of the incident
gamma radiation in the LAT field of view. Interaction Analysis, Shield/Blanket Analysis
5.8 The false VETO signal rate due to noise shall result in a rejection of no more than 1% of triggered gamma rays.
CPT (LAT-TD-01112), Step 19, 30
5.11.2 The fast VETO signal latency shall be commandable from 200-1600 ns after particle passage CPT (LAT-TD-01112), Step 44
5.11.3 A map of the tiles that produce VETO signals shall be generated for each Level 1 Trigger Acknowledge.
CPT (LAT-TD-01112), Step 8
5.11.4 The map of VETO signals shall be latched by the time the ADC's conversions are completed. GARC Functional Test
5.11.5 The logic VETO map shall represent the state of all ACD discriminators at the time of the particle passage (± 200 ns) causing the Level 1 Trigger Acknowledge.
CPT (LAT-TD-01112), Step 8
5.11.6 The fast VETO output signal shall have a commandable width of 50 - 400 nsec, after 'de-glitching' on 2 successive clock pulses. The leading and trailing edges must be synchronous with clock pulses.
FREE Functional Test (ACD-PROC-000051)
5.11.7 For a signal equivalent to 200 MIPs, the logic VETO signal shall be no longer than 10 ìs. (current design will be < 5 usec).
FREE Functional Test (ACD-PROC-000051)
SRD Requirement
LAT Level 2b Requirement LAT-SS-00010
ACD Level 3 Requirements LAT-SS-00016
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 21
Requirements Traceability and VerificationEffective Area Requirement Flowdown
Verification5.11.9 The VETO signals caused by individual PMTs will be transmitted to the LAT AEMs, where they will be
OR'ed together (for each tile or ribbon), and used by the AEMs to generate trigger primitives.N/A
Verification5.2 The TKR shall convert at least 65% of the gamma rays with energy > 10 GeV impinging upon the
device at normal incidence.SVAC Plan, Measurement S1, C13
5.2 The TKR shall convert at least 65% of the gamma rays with energy > 10 GeV impinging upon the device at normal incidence.
SVAC Plan, Measurement S1, C13
5.3 At least 25% of the gamma-ray conversions shall occur in high-Z converter foils no greater than 3.5% radiation lengths thick
SVAC Plan, Measurement S1
5.3 The remainder of the conversions shall occur in other material and converter material < or = 25% X0 thick.
SVAC Plan, Measurement S1
5.5 The TKR shall have an active area at normal incidence of at least 19,000 cm2.5.11 The TKR trigger shall be on average at least 90% efficient for the set of gamma ray conversions from
which the conversion products traverse the active areas of at least 3 consecutive measurement planes.
5.11 In the case that no charged particles or gamma rays are incident upon the TKR, the TKR trigger shall not exceed a rate of 500 Hz.
5.12 The noise occupancy in the TKR data stream shall not exceed 1 in 10,000 channels per trigger. SVAC Plan, Measurement C10
5.13 The dead-time imposed by the TKR readout shall not exceed 10% at a cosmic ray trigger rate of 10 kHz.
SVAC Plan, Measurement C27
Verification5.9 The CAL shall provide a prompt (within 2 µs of an event) low energy trigger signal to the LAT trigger
system with a detection efficiency of greater than 90% for 1 GeV gamma rays entering the CAL from the LAT field of view with a trajectory which traverses at least 6 radiation lengths of CsI.
SVAC Plan, Measurement C24, CAL Lo Discriminator
5.10 The CAL shall provide a prompt (within 2 µs of an event) high energy trigger signal with a detection efficiency of greater than 90% for 20 GeV gamma rays entering the CAL from the LAT field of view that deposit at least 10 GeV in the CsI of the CAL.
SVAC Plan, Measurement C25, CAL Hi Discriminator
CAL Level 3 Requirements LAT-SS-00018
TKR Level 3 Requirements LAT-SS-00017
ACD Level 3 Requirements LAT-SS-00016 (continued)
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 22
Requirements Traceability and VerificationEffective Area Requirement Flowdown
Verification5.2.7 The L1 trigger system shall be able to generate L1 Trigger Acknowledge signals with a minimum
spacing down to the larger of: minimum dead-time imposed by the CAL system, or minimum dead-time imposed by the TKR or 5 ms. (The latter would result in dead-time of 5% at 10 kHz rate if the CAL had no dead-time)
5.4.10 The dataflow system shall contribute < 5 % to the instrument dead-time at a L1TACK rate of 10 kHz, due primarily to background events, for average size events. Above 10 kHz dead-time shall increase to keep the throughput at 10 kHz.
Electronics Level 3 Requirements LAT-SS-00019
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 23
Requirements Traceability and VerificationExample of Flowdown from Mission System Specification
M ission System SpecificationLAT M ass < 3000 kg
Tracker Level 3 SpecificationLAT-SS-00017
LAT Level 2(b) SpecificationLAT-SS-00010
5.3.6 M ass < 3000 kg
AC D Level 3 SpecificationLAT-SS-00016
5.19 M ass < 280 kg
C alorim eter Level 3 SpecificationLAT-SS-00018
5.12 M ass < 1440 kg
E lectronics Level 3 SpecificationLAT-SS-00019
5.7.2 M ass < 220 kg
5.14 M ass < 510 kg
M echanical Level 3 SpecificationLAT-SS-00115
8.1 M ass < 345 kg
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 24
Requirements Traceability and Verification
In terface R equirem ents D ocum entC TD B shall be com pliant
w ith M IL-STD -1553B.
LAT Level 2(b) SpecificationLAT-SS-00010
5.3.4 D ata Services
E lectron ics Level 3 SpecificationLAT-SS-00019
5.3.1 Spacecraft C om m andingInterface
F light Softw are Level 4 Spec.LAT-SS-00399
5.3.1.1.1 C om m and, Telem etryand D ata Bus P rotocol
Example of Flowdown from Interface Requirements Document
• Verification of this requirement includes hardware and software components.
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 25
Requirements Traceability and Verification
• Future Work– Near term
• Incorporate all CCB-approved Level 2 and 3 changes in requirements document revisions (ECD 6/13/2003)
• Bring DOORS database up-to-date with recently released test plans (ECD 6/30/2003)
• Release reports for all requirements verified by analysis (ECD 7/31/2003)
– Long term• Prepare requirements verification table for level 2 and 3
requirements
– Link requirements to test procedures (ECD June 2004)
– Link requirements to test data packages (On-going as tests are completed. ECD June 2005)
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 26
PDR (Jan 2002)
ICD Status:TKR Draft w / 6 TBX 'sCAL Draft w / 26 TBX 'sACD Draft w / 38 TBX 's
dPDR (July 2002)
ICD Status:TKR Draft w / 16 TBX 'sCAL Draft w / 22 TBX 'sACD Released w/ 16 TBX 's
CDR (May 2003)
ICD Status:TKR Released w / 0 TBX'sCAL Released w / 0 TBX'sACD Released w / 0 TBX'sElectronic Therm&Mech Draftw / 9 TBX's
W eekly IntefaceM eetings
Frequent em ail andphone exchanges
W eekly IntefaceM eetings
Frequent em ail andphone exchanges
I/F m eetings as needed Em ail and phone
exchanges ICD 's updated as needed Conduct fina l review for
E lectronics M ech/ThermICD
In teface M eetings Em ail and phone
exchangesDraft ICD's
Interface Development
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 27
Rad
iato
rRad
iato
r
Grid Base Ass’y
CAL
TKR
ACD
X-LAT Plate
EM
I S
kir
tRadMntBkt
Electronics
Htr SwBox
Spacecraft
LV Payload Attach Fitting
EM
I Skirt
RadMntBkt
Htr SwBox
SolarArray
SolarArray
Thermal
Structural
EMI/Grounding
Accommodation
Direction of arrow signifiesdirection of reliance, structuralsupport or heat flow
Structural/Thermal Interface Overview
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 28
Electrical Interface Overview
CAL
TKR
ACD
ACD
ACD
0 1 11Tower 0
CAL
TKR
Tower 1
CAL
TKR
Tower 15
4.1.7 Data-Acquisiton
(DAQ) System
Spacecraft
LAT
VCHPHeaterControl
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 29
Interface Documentation StatusDocument Status
LAT-SC (Spectrum Astro Managed Document) 1196 EI-Y46311-000 First draft out for reviewCalorimeter
LAT-DS-00233-3: CAL-LAT Interface Definition Drawing Final draft out for subsystem reviewLAT-SS-00238-4: CAL-LAT Mech, Therm, Elec Interface Control Document Released 13 Mar 03
ACDLAT-DS-00309-1: ACD-LAT Interface Definition Drawing Final draft out for subsystem reviewLAT-SS-00363-4: ACD-LAT Mech, Therm, Elec Interface Control Document Released 17 Dec 02
TrackerLAT-DS-00851-1: TKR-LAT Interface Definition Drawing First draft in-progressLAT-SS-00138-5: TKR-LAT Mech, Therm Interface Control Document In Signature CycleLAT-SS-00176-2: TKR-LAT Elec Interface Control Document Released 27 Jan 03
ElectronicsLAT-DS-01630-1: Electronics-LAT Interface Definition Drawing First draft in-progressLAT-SS-01794-1: Elec-LAT Mech, Therm Interface Control Document First draft in-progress
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 30
LAT Internal Interfaces
Interface Structural Thermal Grounding/Shielding Accommodation
TKR Grid8 Ti flexures/bay, bolted and pinned to Grid
Cu thermal straps from TKR sidewalls dry-bolted to Grid
Slots in Grid provide race ways for TKR flex cables
CAL GridBolted tabs in CAL back plate develop shear at joint
Tab dry-joint under high bolt pre-load transfers CAL heat to Grid
Mating alum surfaces are alodined for AC/DC grounding
E-Boxes CAL4 Ti stand-offs/bay support E-Box stack off CAL module
Low-conductivity stand-offs and surface finishes minimize heat transfer
E-Box and CAL alum surfaces alodined for AC/DC grounding
E-Boxes X-LATE-Boxes support X-LAT Plate against out-of-plane deflection
Thermal straps transfer E-Box heat to X-LAT Plate
ACD GridCorner bolts and mid-side bolts/pins
Bolted dry joint and radiative coupling transfers ACD heat to Grid
Mating alum surfaces are alodined for AC/DC grounding
TKR ACDTKR black-painted sidewalls view ACD inner CFC honeycomb facesheet
RadiatorRad Mnt
BktBolted/pinned joints carry all Radiator loads
Isolating gasket minimizes survival heat-leak from Grid
Rad Mnt Bkt
GridBolted/pinned joints carry Radiator and Switch Box loads
Mating alum surfaces are alodined for AC/DC grounding
Grid RadiatorVCHP's mount to HP patch plate hanging from Grid
VCHP-DSHP silicone wet joint is primary heat path for Grid heat
Switch Box
Rad Mnt Bkt
Switch box bolted to Rad Mnt Bkt
Silicone wet joint removes small heat load to Rad Mnt Bkt
Shielded cables carry ground
E-Boxes EMI Skirt Skirt shields internal E-Boxes Connectors mount to Skirt EMI Skirt Grid Bolted joint Taped for EMI shielding
X-LAT EMI Skirt Bolted, pinned joint Taped for EMI shielding
X-LAT RadiatorVCHP-XLHP silicone wet joint is heat path for Elec heat off X-LAT
Interface is low risk and is f inalized
Interface design not yet f inalized or tested
Interface design is incomplete
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 31
LAT External Interfaces
Interface Structural Thermal Grounding/Shielding Accommodation
Radiator SC BusSC struts restrain Radiator against out-of-plane loads
MLI on both surfaces to minimize radiative coupling
Radiator size/position fit around SC, flexures
Solar Arrays
RadiatorCold-/hot-case SA backloading affect peak LAT temp's, survival heater needs
Cut-out in Radiator allows SA boom to pass through
GridSC
FlexuresBracket below Grid accepts bolts, pins from Flexure
Grid Bracket allows for SC attach
EMI SkirtSC
FlexuresSkirt is recessed for clearance to flexure
X-LAT SC BusMLI on both surfaces to minimize radiative coupling
Cable tie-downs to support SC cables
Interface is low risk and is f inalized
Interface design not yet f inalized or tested
Interface design is incomplete
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 32
Key Open Interface Issues
INTERFACE KEY OPEN ISSUES STATUS RESOLUTION ECD Detailed design complete Testing is underway Focused on a pinned design implemented with bolts to the Grid.
Preliminary analysis and tests confirms design meets interface requirements
ACD None Thermal design developed using vel-therm and parallel thermal paths Preliminary analysis confirms design meets interface temperature requirements.
Spectrum Astro to analyze CG impacts to ACS. LAT to further refine worst-case estimates without impacting current subsystem plans.
Hold frequent splinter meetings until issue is resolved. Status issue at weekly interface meeting.
Tracker Validating TKR-Grid copper strap thermal design.
TKR to complete thermal testing as part of Engineering Model test plan closure.
NEED DATE
Calorimeter Validating CAL Base Plate to Grid structural design.
NEED INFORMATION FROM MARC CAMPELL.
NEED DATE
Electronics Validating X-LAT Plate to Electronics box thermal joint design.
Qualification and Engineering Model testing to validate design.
6/1/03
Spacecraft LAT lateral center-of-mass requirement is being refined as part of the Spectrum Astro Attitude Control Subsystem design maturation.
LAT calculated worst-case estimates. 6/1/03
Spacecraft Finalize harness definition and routing.
Concept proposed and is being evaluated for structural interferences.
6/1/03
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 33
Summary
Weekly Telecons and Frequent Splinter Meetings have resulted in:– LAT-SC ICD released
– TKR, CAL and ACD ICD’s released and contain 0 TBX’s
– Electronics-LAT Mechanical/Thermal ICD near completion and soon to be released
– All Interface Definition Drawings released
– Key open interface issues to be resolved by June 2003
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 34
GLAST Large Area Telescope:GLAST Large Area Telescope:
LAT FMEA/PRA/Reliability
Tim Thurston SLAC
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 35
System FMEA/PRA/Reliability
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 36
GLAST Large Area Telescope:GLAST Large Area Telescope:
System Engineering Subsystem WBS: 4.1.2
Tom LeisgangLAT Systems EngineeringTest & Verification
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 37
Requirements Verification Process
CorrellateResults
Parse intoDOORS
IdentifyRqt.
Link toVerification
C reate V erifica tion M atrixRequirements Traceability
LAT Systems Engineering
GLAST Project
SPECIFICATIONS Test Plans
TKR
CAL
ACD
Mech
T&DF
Flt S/W
Therm al
Dynam ics
EMI/EMC
Procedures
TestReport
AnalysisReport
AnalysisReport
AnalysisReport
TestReport
TestReport
TestReport
Results
T-VAC
Funct
CPT
EMI
Dynam icsLAT IIB
LAT III
LAT IV
433-SPEC433-IRD
433-IRD
Survey &Alignm ent
W eight &CG
SV&C
LAT-MD-00466IPVP
LAT-MD-00488
A tested and certified instrument
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 38
LAT Test Plan Organization
LAT Perform ance &Operation Test P lans
Subsystem TestPlans
LAT Instrum ent Perform anceVerification Plan
LAT Integration & Test P lan
LAT Contam ination ControlPlan
Electrical Perform ance Tests
Dynam ics Tests
Instrum ent Calibration
E. Bloom
Tracker Tow er Test P lanLAT-TD-00155
Calorim eter Test P lan
ACD Test P lan
Therm al S /S Test P lan
M echanical S /S Test P lanLAT-SS-00493
TEM
GASU
SUI
EP PDU
LATTrigger &Datflow Test P lan
LAT Instrum entation P lan
W . Davis
Com ponentAliveness T ests
SubsystemIntegration T ests
LAT L im itedPerform ance
T ests
LATCom prehensive
Perform anceT ests
LAT O perationalPerform ance T ests
E. Gaw ehnM . Lovellette
L. W ai
E. Do e Couto E S ilva
M . Lovellette
J. CullinanE. Gaw ehn
EGSE W orkstation &Softw are Validation Plan
R. Claus
LAT-M D-01376
LAT-M D-01055
LAT-M D-01587
LAT-M D-00452
LAT-M D-00404
LAT-M D-00890
LAT-SS-00262
LAT-TD-00296
LAT-M D-00408
ACD-PLAN-000050
LAT Flight Softw are TestPlan
LAT-TD-00786
LAT SV&C Test P lan
E. Do Couto E SilvaT . Leisgang
LAT-M D-00446
LAT EM I/EM C Test P lan
T. LeisgangM . Lovellette
LAT Therm al Test P lan
J. W angM . LovelletteLAT-M D-01600
Therm al Tests
M . Lovellette E. Gaw ehnLAT-M D-0xxxx
LAT Dynam ics Test P lan
Y Ism aelM . LovelletteLAT-M D-01196
M echanical W eight & CG
E. Gaw ehnLAT-M D-01598
L. W ai
LAT Survey & Alignm ent
L. W ai LAT-M D-01586
LAT Survey P lan
M . NordbyL. W aiLAT-TD-00895
LAT Handling&Transportation Plan
T. Leisgang
LAT-M D-01533
No Num ber
LAT-M D-00649
No Num ber
No Num ber
LAT Beam and ParticleTest Plans
G. Godfrey
M -GSEE. Gaw ehn LAT-M D-01462
E-GSE Developm entM . Huffer LAT-M D-01533
FacilitiesL. W ai LAT-M D-01386
LAT M echanical Integration
E. Gaw ehnL. W aiLAT-PS-00676
LAT EM I Tests
M . LovelletteLAT-M D-01838
LAT-M D-0440
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 39
LAT Performance Verification
ObservatoryIntegration
Sine Vibe
T ow erIntegration
L A TIntegration
L A T T es t ObservatoryIntegration
TKR
CAL
TEM
Grid
Radiators
EP
SIU
GASU.
PDU
ACD
IntegrateE-Boxesw / Grid Delivery
Aliveness Limited
X-LAT Plate
C
CLE A
A
M assProperties
Survey
EM I/EM C
L
InstallRadiators
Acoustic
L
C
Thermal Vac
ThermalBalance
C L
C
Final M assProperties L
A
Ship toSA
F
F
F
Survey
M
M
M
L
M
O Optical M M uon
IntegrateTKR/CAL &TEM 's w ith
Grid
SurveyO
IntegrateX LAT Plate
M echanical Fit-Checks
SurveyM
M odalsurvey
E
L
Functional
Survey:
L
Interface Comprehensive
Environmental Tests
E
M
C
v C D R 4 /14/03
Htr Box
EMI Shield
IntegrateACD
IntegrateEMI Skirt, Htrsw itch boxes
SurveyO
Sine BurstL
O
M
Electrical Tests Performance
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 40
LAT Science Verification
Tracker
Qu
al
Mo
du
les
En
gin
ee
rin
gM
od
el
Ca
libra
tio
nU
nit
LA
T
Co
smic
Ray
s o
n t
he
Gro
un
d
SLAC ES-A
Positrons
Photons
Protons
Van de Graf
(17 .6 M eV )
Si Strips noisy dead
t
threshold
Calorim eterLight YieldScintillat. E ffcyPedestals (L)Energy Range (L)
Elex. GainInteg. Non;InearityD iff. Non;Inearity
Light Asym etryLight Attenuation
ACDPedestals(L)
Detection Effcy.High Threshold
Detect.
Van de Graf
(17 .6 M eV )LATAlignm ent
LATAccuracy
Dead Tim e
TrackerEfficiencyAlignm ent
SSD,Laddertray,towerinter-tower
TKRAll
Cal
Calibrations Science Verification Particle tests
E ffective A rea A bsolu te energy E nergy R eso lu tion A ngu lar D istribu tions
on and o ff axis B acground R e jection M onte C arlo S im ula tion
V a lida tion
Reconstruction Software C harged T rack
reconstruction e ffcy. C onversion
A bsolu te E nergyon and o ff axis
E ffcy. fo r track w /A C D h its
M onte C arlo S im ula tion
poin t & e ffcy.
C A L E ffcy. fo r track
Flight LAT
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 41
Subsystem Qualification Programs
RandomThermalVacuum
CPT
LPT CPT/LPT
Sine
VIBRATION
Shock**
LPTHumidity/Storage
CPT
CPT
THERMAL
Qualification Test Sequence
**As required
EMI/EMC*
FINAL
LPTCPT
LPT*
C
C
C
C
C
C
L L L L
L
L
L
L
L
I/F
I/F
*EMI/EMC Tests may be performeed anyw here w ithin the flow
EMI/EMC*
TRR
RFU
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 42
Subsystem Acceptance Test Program
ThermalVacuum
CPT
CPT
LPT
CPTCPT/LPT
Acceptance Test Sequence
Random
VIBRATION Thermal
Burn-In
CPT
FINAL
I/F I/F
TRR
RFU
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 43
Performance Verification :Thermal
ACD4 Cycles T/
V& T-Bal
Tracker12 Cycles
T/V& T-Bal
Calorim eter12 Cycles
T/V& T-Bal
Electronics12 Cycles
T/V& T-Bal
Qu
al
Pro
to-f
lig
ht
Acc
epta
nce
LA
TO
BS
LAT4 Cycles T/V& T-Bal
OBS4 Cycles T/V& T-Bal
Tracker4 Cycles
T/V
Calorim eter4 Cycles
T/V
Electronics4 Cycles
T/V
RadiatorsTBD Cycles T/V & T-Bal
Grid Box
X-LATPlates
EM IShield
Cables
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 44
Performance Verification: Dynamics
Tracker Calorim eter Electronics
Qu
al
Pro
to-f
lig
ht
Acc
epta
nce
LA
TO
BS
Tracker Calorim eter Electronics
Radiators
X-LATPlates
EM IShield
Cables
Shock
W eightCgM odal
Grid BoxStatic Load
R R R
S SB RS
ACDshell + BFA
ACD sub assy
A
A
AS
SB R
SB RSB R
SB R
SB R
SB
SB
S
S
S
S A
S SB R A
LAT
Sine SineBurst Random AcousticKEY
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 45
Performance Verification: Electronics
Pow er
Perform ance
Qu
al
Acc
epta
nce
LA
T
Pow erFull
Perform ance
Lim itedPerform ance
Pow erOperational
Perform ance
EM ICE(cm )CS(cm )
EM I
Full Suite
EM I
RE,RS,CE,CS
I/F Verification
Full Suite
I/F Verification
Full Suite
I/F VerificationIsolation
Hi-PotPwr D istCm d. D ist
FunctionalCom prehensive
A liveness
Perform ance
FunctionalCom prehensive
A liveness
Aliveness
Perform ance
Aliveness
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 46
LAT Verification Summary
• All LAT subsystems and LAT Instrument have complete requirements verification
• All MAR test requirements are performed and verified
• All Science Requirements are verified
• Systems Engineering has a “closed loop” requirements verification process in place
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 47
Systems Engineering
DRAFT
Cost/Schedule Summary
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 48
CCB Actions Affecting 4.1.2
Change Request # Description Status
LAT-XR-01395-01 Systems Engineering Manpower
Approved $2.2M
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 49
Budget, Cost, Performance
Budget vs Actuals vs PerformanceDOE + NASA Project Expenditures
4.1.2 System Engineering
0
3
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FY00 FY01 FY02 FY03 FY04 FY05
$M
, E
scala
ted
Do
llars
Actual Commitments
ACWPBCWP
BCWS+ Planned CommitmentsBCWS
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 50
Cost/Schedule Status
Item In k$
Budget at Complete 4,647
Budgeted Cost for Work Scheduled (a) 2,583
Budgeted Cost for Work Performed (b) 2,577
Actual Cost for Work Performed 2,880
Cost Variance -302 -11.7% of (b)
Schedule Variance -6 -.2% of (a)
• Status as of February 28, 2003:
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 51
Manpower Plan
0.0
0.5
1.0
1.5
2.0
2.5
Q3FY00
Q4 Q1FY01
Q2 Q3 Q4 Q1FY02
Q2 Q3 Q4 Q1FY03
Q2 Q3 Q4 Q1FY04
Q2 Q3 Q4 Q1FY05
Q2 Q3 Q4
FISCAL YEAR BY QUARTERS
FT
Es
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 52
Procurements
• Long-Lead Procurements
• Major Upcoming Procurements Near-Term (< 4 months)– Orbital Network Engineering
– Stellar Solutions
• Major Upcoming Procurements Long-Term (>4 months)
• Minor Upcoming Procurements
GLAST LAT Project CDR/CD3 Review May 12-16, 2003
Document: LAT-PR-01967 Section XX 53
Summary
• To be provided