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GLAST Large Area Telescope (LAT) Environmental Testing Status Update

The GLAST Large Area Telescope (LAT) completed commissioning at SLAC on May 10th and has since undergone rigorous environmental testing at NRL. The testing, including Vibration Lab and System Commissioning, has been successful with no significant anomalies detected so far. The LAT project has efficiently transitioned activities to NRL and continues to progress with new flight software and calibrations.

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GLAST Large Area Telescope (LAT) Environmental Testing Status Update

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  1. Gamma-ray Large Area Space Telescope LAT StatusEnvironmental Testing GLAST Large Area Telescope: W Neil Johnson Naval Research Lab neil.johnson@nrl.navy.mil (202) 767 - 6817

  2. LAT Status • LAT completed commissioning at SLAC May 10th. • Determined effort by the Commissioner: Eric Grove • Excellent support leadership from • System Engineering: Pat Hascall • Electronics/ FSW: Gunther Haller • I&T OnLine: Ric Claus • OffLine: Anders Borgland • Packed up on May 11th and departed by dedicated truck (photos to follow) • Arrived NRL on Sunday, May 14th and installed in clean tent. MGSE and EGSE arrived on Tuesday, May 16th. • Up and running by Wednesday, completed post ship comprehensive performance test on Friday. • Continued calibrations and additional tests thru the weekend. • Installed new flight software and completed regression tests by Wednesday • Successfully completed Pre Environmental Review with GSFC on Thursday. • Moved to Vibration Test Lab on Friday. Vibe testing began yesterday.

  3. Sensors ACD before installation of Micrometeoroid Shield 1 of 16 Calorimeter modules 1 of 16 Tracker modules

  4. LAT before installing the ACD

  5. LAT with ACD and protective cover

  6. Data Acquisition System (-Z) EPU PDU PDU EPU HIB GASU HIB GASU HIB HIB HIB SIU SIU EPU

  7. -Z with the Cross LAT plate installed

  8. LAT on Shipping Container Base

  9. Closing up the shipping container

  10. Loading LAT on the “IceBreaker”

  11. The IceBreaker

  12. Arrival at NRL’s Naval Center for Space Technology

  13. Moving to Vibe Lab

  14. Lift on to Vibe Table

  15. On Vibe Table for Z-axis Test

  16. LAT Test Flow System Commissioning/ System Test 5/11/06 Shipment 5 days 5/16/06 You Are Here Install Radiators Offload & Set-up LAT Sine Vibe EMI/EMC Test Acoustic Test CPT 5 days 5 days 9 days 11 days 7 days 2 days PER 5/25/06 7/10/06 Remove Radiators T- Bal T- Cycle Pre TV CPT Pack and Ship Weight & CG 3 days 2 days 2 days 2 days 9/15/06 8 days 40 days PSR 9/13/06 NOTE: Durations for moving and setup have been incorporated into the total duration for the test.

  17. Conclusion • The LAT is complete and tested. • No significant anomalies detected to date, except • Radiator heaters were damaged during assembly process and are now being replaced • No performance anomalies detected. Trending shows same instrument throughout assembly and test program. • The LAT Flight Software is essentially complete. • Missing GRB detection algorithm and event filter additions • Neither particularly relevant for ground testing. • Development will continue on the test bed at SLAC. • New OnLine operating system – LICOS – commissioned • The LAT project has successfully transferred activities (and people) to NRL and is efficiently executing its environmental test program.

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