1. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 1 Presentation 1 of 12 GLAST Large Area Telescope: LAT Pre-Shipment Review W Neil Johnson Naval Research Lab LAT Dpty PI for Instrument/Observatory Operations neil.johnson@nrl.navy.mil (202) 767-6817 Gamma-ray Large Area Space Telescope Project Overview

2. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 2 Presentation 1 of 12 Instrument Design: 4x4 modular array e+e+ e–e–  Si Tracker pitch = 228 µm 880,000 channels 18 X-Y layers of silicon w/ tungsten foil converters (12 layers × 2.8% X 0 + 4 layers × 19% X 0 + 2 layers) Mechanical Sys. (inc. Grid & Thermal Radiators) 3000 kg, 650 W (allocation) 1.75 m  1.75 m  1.0 m 20 MeV – 300 GeV CsI Calorimeter Hodoscopic array 8.4 X 0 8 × 12 bars of CsI 2.0 × 2.7 × 32.6 cm Anti-Coincidence Detector Segmented scintillator tiles 0.9997 efficiency Electronics, Data Acquisition, & Flight Software LAT measures direction and energy of incoming gamma rays

3. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 3 Presentation 1 of 12 LAT Status  LAT has completed its environmental test program –Currently being loaded into transport container for delivery to General Dynamics C4 – SASS.  No major failures or environmental susceptibilities were discovered.  No significant performance changes throughout the program –Performance over temperature is stable  LAT requirement verification sell off is in progress –459 Requirements –72% (329) verification reports submitted to mission office –48% (219) reports accepted  LAT End Item Data Package (EIDP) is in progress

4. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 4 Presentation 1 of 12 LAT Project Milestones

5. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 5 Presentation 1 of 12 LAT Organization Chart: to launch + 60 days Principal Investigator P. Michelson Instrument Scientist S. Ritz Senior Science Advisory Committee N. Gehrels Collaboration Science Team Instrument Science Performance S. Ritz, W. Atwood K. Fouts Project Manager Integration &Test K. Fouts (A) ISOC R. Cameron EPO L. Cominsky Mission Assurance J. Cullinan Project Controls L. Price Administration D. Viera Deputy Principal Investigator Science Operations S. Ritz Deputy Principal Investigator Instrument/ Observ. Operations N. Johnson System Engineering P. Hascall Flight Software J Thayer LAT Commissioner E. Grove LAT Advisors L. Klaisner D. Horn Contract/subaward Management N. Christiansen LAT Operations Steering Committee N. Johnson, S. Ritz, Co-chairs

6. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 6 Presentation 1 of 12 Weight & CG CPT Sine Vibe Offload & Set-up LAT Offload & Set-up LAT 5 days 9 days Install Radiator s 3 days EMI/EMC Test 11 days Acoustic Test 7 days 3 days Remove Radiator s Remove Radiator s 2 days LAT Environmental Test Flow Plan and Performance Pack and Ship 2 days T- Bal Pre TV T- Cycle 43 days CPT NOTE: Durations for moving and setup have been incorporated into the total duration for the test. Shipment System Commissioning/ System Test 3 days 5/11/06 5/08/06A 5/14/06A 7/10/05 7/05/06A 9/15/06 9/18/06A Arrival SASS PER 5/25/06A PSR 9/13/06 9/15/06A PSR 9/13/06 9/15/06A 6/14/06A 6/24/06A 7/1/06A 7/29/06A 9/07/06A 9/12/06A 7/5/06A 5/20/06A PER Plan date in black Actual date in red

7. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 7 Presentation 1 of 12 Issues / Liens to Delivery  Current LAT Flight Software does not meet all 183 requirements –LAT environmental testing performed with FSW B0.6.9 Demonstrated 149 / 183 requirements Over 1100 hrs of run time w/ B0.6.9 (over 1600 total hours) Over 800 million events (mainly cosmic muons) processed. Missing final event filters, data compression, GRB support –FSW B0.7.0 installation planned post ship to SASS 173 / 183 requirements (all but on board GRB detection algorithm) FQT of these 173 requirements has been completed on LAT test bed at SLAC. –FSW B1.0.0 installation prior to Observatory test. 183 / 183 requirements  Unexpected reboots of LAT flight computers (SIU / EPU) –Observed 7 reboots in ~ 1600 hours of operations (3 CPUs operating at all times) Probable root cause on about half indicate EGSE source 1 hardware error – transient uncorrectable memory error At least 2 (during TVAC) can not be explained by EGSE - watchdog

8. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 8 Presentation 1 of 12 LAT Flow – Path Forward T- Bal Pre TV T- Cycle 3 days2 days Weight & CG Remove Radiator s Remove Radiator s Pack and Ship 39 days 9/16/06 PSR 9/15/06 9/07/069/12/067/05/06A CPT Unpack LAT CPT LAT Integration CPT Observatory EMI/EMC CPT Acoustic Test Sine Vibe Sep Shock CPT Ship to Launch Site T- Bal Pre TV T- Cycle CPT LAT FSW Install/Test CPT 3 days1 day 2 days3 days 8 days3 days 9/18/069/23/06 9/28/06 Install Radiator s Install Radiator s 10/01/06 12/15/06

9. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 9 Presentation 1 of 12 LAT on Test Stand Return from Sine Vibe

10. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 10 Presentation 1 of 12 Radiators Installed and Micrometeoroid shield exposed Prior to MLI blanket installation – exposed micrometeoroid shield

11. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 11 Presentation 1 of 12 Installing the MLI Blankets Now, 102 uses for duct tape (actually Ge coated Kapton outer ACD MLI blanket) Final LAT dressing – 2 tone MLI blankets

12. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 12 Presentation 1 of 12 Prep for TVAC Need to rotate from +Z vertical orientation to +X vertical orientation VCHP need to be horizontal to operate w/ gravity for TVAC

13. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 13 Presentation 1 of 12 Thermal Test Equipment Sink plates w/ heaters simulate solar load on ACD and other components

14. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 14 Presentation 1 of 12 Move to TVAC CALROD cages (toaster elements) simulate heat loads on radiators Trolley interfaces w/ rail system in TVAC chamber

15. GLAST LAT ProjectSeptember 15, 2006: Pre-Shipment Review Project Overview 15 Presentation 1 of 12 LAT on Shipping Container Base Ready to Ship!