GLAST Proposal Review

1
GLAST Large Area Telescope I T Input to LAT
Planning Meeting July 17th and 18th Elliott
Bloom SU-SLAC Subsystem Manager Brian
Grist SU-SLAC Subsystem Engineer elliott_at_slac.sta
nford.edu, bgrist_at_slac.stanford.edu 650-926-2469
650-926-2998
2
Key Milestone List to Delivery (Not Necessarily
in Current PMCS)

• EM Plan, Procedures, EGSE and MGSE
  Complete 07/31/03
• Receive CAL EM 08/08/03
• Receive TKR mini-tower 08/22/03
• EM Tower functional tests Complete 09/18/03
• EM Tower Available for use by Flight
  Software 09/18/03
• EM Calibration Complete 10/12/03
• EM mechanical fit check using 1X4 Grid, TKR Mech
  tower, CAL 10/13/03
• CAL EM at NRL Loading Doc TKR mini-tower in
  Italian Customs 10/17/03
• Support GSI Beam Test (CAL and TKR
  mini-tower) 11/14/03
• All IT Flight Techs on Staff (Mechanical and
  Electrical) 12/15/03
• Flight Integration Training MGSE
  Ready 01/15/04
• All Flight Integration Procedures
  Complete 02/15/04
• All Flight Integration MGSE Complete with
  SDP 03/01/04
• LAT Assembly Configuration EGSE Ready For
  Use 03/01/04
• Integration Readiness Review 03/15/04
• TKR A/B Available RFI 04/15/04
• Grid Available RFI 05/20/04
• CAL A/B Available RFI 05/20/04

3
Multi-Tower EGSE (9/15/03)
TDF System (LAT)
EGSE
EGSE Crate
ACD or Sensor Simulator
CPU
LCB
WAN

GASU
28 V Supply
Central Database
EBM
VME
AEM
GEM
Online Workstation
TEMs
Firewall
CAL, TKR or Sensor Simulator
SLAC
4
Single Tower EGSE Configuration (GSI test)
Electronics/Online

• Online
• Workstation
• Test Exec
• Configuration
• Commanding
• Telemetry
• Event Processing
• Monitoring
• Visualization
• Data base
• Message logger
• Alerts
• Electronic log

Subsystem/simulator
Back door debug RS-232
Subsystem (or simulator)
Central Database
VME Chassis

• CPU
• Commanding
• Telemetry
• Monitoring
• Hardware Drivers

AEM/TEM
WAN
Ethernet
Main Dataflow Ethernet

• LAT-COMM
• External Trigger

Ethernet Router and Firewall
DC Power
External Hardware
5
Key Milestone List to Delivery After Start of
Flight IT (Not in Current PMCS)

• Start Tower A/B Installation/Test 05/20/04
• Start Tower 1/2 Installation/Test 07/01/04
• Start Tower 13/14 Installation/Test 10/28/04
• Finish Tower Installation/Test 11/11/04
• Finish Installation of ACD/ELEX/X-LAT 12/23/04
• Flight Configuration Ready for System
  Test 12/23/04
• Complete System Test 04/21/05
• LAT Shipped for Environmental Testing 07/21/05
• Environmental Testing Complete 11/03/05
• LAT RFI 12/01/05

6
LAT Assembly Configuration (3/1/04)
LAT
EGSE
Spacecraft simulator
SIU
ACD or Sensor Simulator
CPU
Discretes
1553
1553
WAN
LCB
GASU
Central Database
EBM
AEM
SSR
3 EPUs
GEM
CPU
Online Workstation
LCB
TEMs
Firewall
EGSE Crate
Test Point on LAT EMI Skirt
CAL, TKR or Sensor Simulator
CPU
LCB
SLAC
7
Complete Flight Unit Configuration CU (12/24/04)
LAT
EGSE
SIU
ACD
CPU
1553
WAN
LCB
GASU
Central Database
EBM
AEM
3 EPUs
GEM
CPU
Online Workstation
LCB
TEMs
Firewall
EGSE Crate
Test Point on LAT EMI Skirt
CAL, TKR
CPU
LCB
SLAC
8
Interdependencies

• Dependent on deliveries from all subsystems to be
  able to do the core of our work.
• EM CAL TKR mini-tower deliveries.
• EM GASU and flight software support from ELX.
• All Flight Hardware and Software.
• MGSE FEM Analysis
• Budget for IT Flight Electronic Techs and the
  hiring of those techs (4 full time people
  starting 12/15/03) is currently the
  responsibility of ELX. IT will schedule the work
  for these Techs.
• System engineering test plans are required as
  input to IT test plans and resulting procedures.
• Mission level EGSE decisions can impact IT EGSE
  schedule and budget.

9
Flight Hardware Procurements

• No flight hardware procured by IT. All flight
  components come from a subsystem.

10
Flight Hardware Manufacturing Plan Status

• LAT-MD-01376 LAT Integration Test Plan In
  Work
• LAT-MD-01137 LAT EM Test Plan In signoff
• LAT-MD-01533 EGSE Plan In revision
• LAT-MD-00446 SVAC Plan Released
• LAT-MD-01587 SVAC Test Plan Released
• LAT-MD-01598 LAT Weight and CG Test
  Plan Released
• LAT-MD-01462 MGSE Development Plan In signoff
• LAT-MD-01836 LAT Dynamics Test Performance Plan
  Draft in Cyberdocs
• LAT-MD-01837 LAT Thermal Test Performance Plan
  Draft in Cyberdocs
• LAT-MD-01838 LAT EMI Test Performance Plan
  Draft in Cyberdocs
• LAT-MD-00676 LAT Assembly Sequence In revision
  
• LAT-MD-01386 LAT Facilities Plan Released
• LAT-MD-01586 LAT Survey Alignment Performance
  Plan In signoff
• LAT-MD-01055 LAT Electrical Test Performance
  plan Released
• LAT-MD-00440 LAT Particle Test Plan In
  signoff

11
Engineering Model Testing Closure Status

• IT Tests of the TKR mini-tower were done and the
  results reported to the Engineering meeting at
  June 10 Engineering Meeting. Data is still being
  worked.
• EM tower (CAL EM and TKR mini-tower) due in
  August to IT
• Complete EM Tower functional test by September
  18th and then make available to Flight Software.
• Complete EM Calibration by October 12th.
• Need 1x4 Grid and TRK EM Mechanical tower a week
  before Mechanical fit check to assemble TRK EM
  into grid.
• Perform a mechanical fit check using 1x4 Grid,
  TKR Mechanical Tower, and EM CAL on October 13th.
• CAL EM on the NRL loading dock and the TKR
  mini-tower in Italian Customs by October 17th.
• Support the GSI Beam Test, including the CAL and
  the TKR mini-tower (run Carbon in the daytime)
  November 14th 24th.

12
Open Flight Design Issues/ Status Trades

• CAL-Grid interface design, impacts IT MGSE,
  assembly, processes, and procedures. Design not
  completed.
• Grid EMI Skirt design impacts IT assembly,
  processes and procedures. Design not completed.
• X-LAT plate design impacts IT MGSE, assembly,
  processes and procedures. Design not completed.
• Radiator interface and MGSE design impact IT,
  assembly, processes and procedures. Design not
  completed.
• Environmental test sensor requirements impact IT
  assembly, processes and procedures. Requirements
  have not been finalized.
• LAT pointing knowledge requirements are under
  review by the project. IT test plans cannot be
  finalized until we know the final requirements.

13
Cost/Schedule Status (May Month End)
Cost Variance GREEN Schedule Variance YELLOW
Beam test change request has been approved and
has been incorporated for the June Report.
The monthly Cost and Schedule Variances are
trending negative
14
Issues/Concerns/Suggestions/Risks

• Late delivery to IT of EM parts and EGSE
  software test scripts.
• Late delivery has delayed preparations for LAT,
  particularly in areas of IFCT and SVAC. Possible
  impact on EGSE.
• Part of EGSE/MGSE verification strategy depends
  on IT EM program.
• Finalization of all LAT test plan requirements is
  not complete post CDR. This is resulting in
  compressed schedule and potential increased cost
  for IT. Current estimates are September for
  completing all test plans from the Design Team.
• Delivery of flight hardware to IT may be late.
• IT EGSE is proceeding with in-house developed
  test executive software. Change to another system
  for Observatory and/or IOC will require major
  cost change request.
• Spacecraft interface detail uncertainty.
• Environmental test fixtures.
• EGSE interface.
• MGSE handling fixtures.
• SIIS fidelity uncertainty.
• Delivery of flight hardware to IT may be late.
• When will a decision be made about where to go
  for Environmental Testing? This will impact
  preparations and design of Vib and T/V fixtures.