GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem...

Subsystem Acceptance 1

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review

Presentation 5 of 12

GLAST Large Area TelescopeGLAST Large Area Telescope

Pre-Environmental Test Review

Subsystem Acceptance Program

Pat HascallSystems Engineering

Stanford Linear Accelerator Center

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope




LAT Test Results RoadmapLAT Test Results Roadmap

• Describe the Subsystem End Item Data Package (EIDP) process

• Summarize the Subsystem test program




Subsystem EIDP ProcessSubsystem EIDP Process

• The individual subsystem boxes were documented and delivered using an End Item Data Package process– Contents of the package defined by Systems Engineering

and I&T, to include test results and NCRs to be transferred to the LAT level

• Each subsystem box has a web page containing links to the relevant Acceptance Test Data Packages– Links to the ATDP web pages are available on the PreShip

Review page:• http://www.slac.stanford.edu/exp/glast/flight/rdm/livepreship/lat_preship_review.html

• LAT Project Management, SE, and QA have accepted all subsystems




Subsystem WebsitesSubsystem Websites

• ACD– http://glast.gsfc.nasa.gov/acd/

• Calorimeter– http://heseweb.nrl.navy.mil/glast/

• Electronics and DAQ– http://www-glast.slac.stanford.edu/Elec_DAQ/Elec_DAQ_home.htm

• Mechanical– http://www-glast.slac.stanford.edu/MechanicalSystems/MechHome.htm

• Tracker– http://www-glast.slac.stanford.edu/Tracker-Hardware/default.htm




Subsystem Environmental Test SummarySubsystem Environmental Test Summary

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√ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √

√ √ √ √ √ √ √ √

√ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √√ √ √ √ √ √ √ √

(c) √ √ √ (d) √ √ √ √ √ √ √ √ √ √ √

√ √ √ √ √ √ √ √(e) √ √(f) √ √ √ √ √ √√ √ √ √ √ √ √ √

√(g) √A √A √

√A √A √A √(h) √

P (i) √ √ √ P √

√(g) P(j) P(j) P P P P P P P P P P P P P P

P P

EMIStruc Loads Thermal

ComponentTracker

Proto-Flight (a)

Flight

CalorimeterProto-FlightFlight

ACDProto-Flight (b)

ELXQualFlight

Grid BoxProto-Flight

X-LAT PlateProto-Flight

RadiatorProto-Flight

LATDeferred to Obs




Subsystem Environmental Test SummarySubsystem Environmental Test Summary

√ Complete

√A Complete. Design margins are sufficient to allow qual by analysis.

P Planned activity

Not required

(a) TKR EMI qual test performed on FM2.

(b) Performed EMI test on qual BEA. ACD-level EMI test waived per LAT-XR-06733.

(c) Performed at lower level of assembly.

(d) Thermal balance waived per LAT-XR-06769.

(e) GASU and TEM/TPS exceeded RE102 spec. See waivers LAT-XR-08171 and LAT-XR-08173.

(f) HCB VCHP feed exceeded CECM spec. See waiver CCR 433-0374.

(g) Performed on grid #2 to qual levels.

(h) Four thermal cycles at ambient pressure.

(i) Perform pull test and acoustic test in lieu of high level sine vibe. Performed tap test in lieu of low level sine vibe. See deviation CCR 433-0368.

(j) W/O Radiators installed. See deviation CCR 433-0368.

LEGEND:




Subsystem Waivers (1/2)Subsystem Waivers (1/2)

CR # Title Description Status

LAT-XR-07058-01

ACD Tile Shell Assembly Interior Volume Stay Clear Violation Interior stay-clear violation of 0.7mm. Approved

LAT-XR-07260-01

ACD Tile Shell Assembly Interior Volume Stay Clear Violation The bottom tile edge violates the stay-clear by 0.5mm. Approved

LAT-XR-07261-01

ACD Outer Volume Stay Clear Violations MLI stay-clear violation of 14mm. Approved

LAT-XR-07263-01

ACD Base Frame Assembly Interior Volume Stay Clear Violation Interior stay-clear violation of 0.4mm. Approved

LAT-XR-06769-01

ACD Thermal Balance Test Eliminate the ACD thermal balance test. Approved

LAT-XR-07833-02

Mass per Unit Area of ACD MMS/TB

To meet the updated orbital debris model, the as-built ACD Micrometeoroid Shield (MMS) and Thermal Blanket (TB) mass per unit area is 0.39 g/cm^2. The requirement is 0.32 g/cm^2. Approved

LAT-XR-07340-01

Tracker Tower Level Hot/Cold Power Cycle

The Tracker tower level hot/cold turn-on sequence test was not performed on tower’s 7, 9, 10, 12 and 13. Approved




Subsystem Waivers (2/2)Subsystem Waivers (2/2)

CR # Title Description Status

LAT-XR-08173-01

TEM/TPS EMI Test RE102 Exceedance

The TEM/TPS exceeded the GPS notch by 14 dBuV and the S-band notch by 2 dBuV. The requirement did not include shielding from the EMI skirt and X-LAT plate. The additional shielding provides a minimum 30dB attenuation. Approved

LAT-XR-08171-01

GASU EMI Test RE102 Exceedance Waiver

The GASU exceeded the GPS notch by 5 dBuV and the S-band notch by 9 dBuV. The requirement did not include shielding from the EMI skirt and X-LAT plate. The additional shielding provides a minimum 30dB attenuation. Approved




SummarySummary

• LAT subsystems were well tested prior to integration• Liens from those subsystem tests have been promoted to LAT

level NCRs where appropriate• Ready to go to environmental test

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem...

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