GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 1 GLAST Large Area Telescope Pre-Environmental.

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Presentation transcript:

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 1 GLAST Large Area Telescope Pre-Environmental Test Review Subsystem Acceptance Program Pat Hascall Systems Engineering Stanford Linear Accelerator Center Gamma-ray Large Area Space Telescope

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 2 LAT Test Results Roadmap Describe the Subsystem End Item Data Package (EIDP) process Summarize the Subsystem test program

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 3 Subsystem 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: LAT Project Management, SE, and QA have accepted all subsystems

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 4 Subsystem Websites ACD – Calorimeter – Electronics and DAQ – Mechanical – Tracker –

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

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 6 Subsystem Environmental Test Summary √ Complete √A√A Complete. Design margins are sufficient to allow qual by analysis. PPlanned 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 (c)Performed at lower level of assembly. (d)Thermal balance waived per LAT-XR (e)GASU and TEM/TPS exceeded RE102 spec. See waivers LAT-XR and LAT-XR (f) HCB VCHP feed exceeded CECM spec. See waiver CCR (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 (j)W/O Radiators installed. See deviation CCR LEGEND:

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 7 Subsystem Waivers (1/2) CR #TitleDescriptionStatus LAT-XR ACD Tile Shell Assembly Interior Volume Stay Clear ViolationInterior stay-clear violation of 0.7mm.Approved LAT-XR ACD Tile Shell Assembly Interior Volume Stay Clear ViolationThe bottom tile edge violates the stay-clear by 0.5mm.Approved LAT-XR ACD Outer Volume Stay Clear ViolationsMLI stay-clear violation of 14mm.Approved LAT-XR ACD Base Frame Assembly Interior Volume Stay Clear ViolationInterior stay-clear violation of 0.4mm.Approved LAT-XR ACD Thermal Balance TestEliminate the ACD thermal balance test.Approved LAT-XR 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 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

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 8 Subsystem Waivers (2/2) CR #TitleDescriptionStatus LAT-XR 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 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

GLAST LAT Project May 25, 2006: Pre-Environmental Test Review Presentation 5 of 12 Subsystem Acceptance 9 Summary 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