1. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 1 GLAST Large Area Telescope: Face to Face Managers Meeting LAT Integration & Test April 13, 2005 2:00 PM Integration and Test 2 towers and next six month Elliott Bloom I&T Manager Ken Fouts I&T Engineering Manager SLAC Gamma-ray Large Area Space Telescope

2. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 2 Last Month's Accomplishments (1 of 4) Management –Tracking hardware shortages for LAT integration. Current shortages are two cables: Thermister cable assembly (LAT-DS-5055), Grid temp sensor cable assembly (LAT-DS-5073) IFCT –Tower A Validated new trigger test scripts from Trigger group Receive and validated new CAL & TKR configurations CPTs, trigger optimization, calibration, data collection, aliveness test completed Van de Graaff testing completed Completed Tower-A Single Bay Tests Installed Tower-A in Grid Bay 0 Tower B FM105 integrated with TEM/TPS-B Completed Tower B installation into single bay test stand Completed Tower-B Single Bay Tests Installed Tower-B in Grid Bay 4 CAL Removed and returned three (2) TEM’s and CAL 118 (spare) to NRL. –MGSE Completed rework of GPR. Completed proof test of integration stand, GPR and PAP’s. GPR fit-up to Grid Complete Installed Grid into MGSE Moved stand to B33 and installed in Rm 104. Complete GPR lift off test to verify ACD clearance. Completed “L” bracket rework to accommodate ACD with greater clearance. Second Single Bay Stand Complete

3. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 3 IFCT (Cont’d) –Mechanical Systems Completed S/C Interface check Completed weight and CG measurement –Electronics Tem/TEM PS A,B handover –Completed safe to mate for ELX prior to hand-off Validated EM GASU –Validation in I&T identified errors that were reworked by ELX requiring return to ELX and retest SVAC –Instrument analysis workshop with first flight tower data completed March 10. –Successful turn around for calibration of single tower data (4 hours). –Offline data processing system under CCB and working. –First evaluation of single tower data complete. Last Month's Accomplishments (2 of 4)

4. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 4 Particle Test –Van de Graaff + BGO Monitor LAT-TD-01805-02 VG delivers 17.6 MeV gammas for I&T tests Single tower testing complete. –Muon Telescope (Bldg 33) LAT-TD-04419-02 Working (~1 Hz) for I&T tests (Single Tower Bay + Grid) Only gives an external trig when muon passes through the tower Used to complete single tower and trigger test. –Muon Telescope (New) (B101 Central Lab) Working (~.5 Hz) for I&T and test bed tests (Mini Tracker) –Am 241 Source LAT-TD-04980-02, LAT-PS-06066 Source, procedure, handling equipment complete for single tower tests Tests in progress (2-3 hours). ECD 3/31 Last Month's Accomplishments (3 of 4)

5. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 5 Online –LATTE 4.8.1 released (need 4.8.2 due to PDU HKP fix) V&V’ed Installed in Bldg 33 flight directories –CAL V2 scripts assessment CAL scripts under I&T online CCB control with only bug fixes. CAL agrees to integrate any script changes via online CCB CM. –LATTE /eLogbook Installed in B33 workstations 4/6 –Continued supported of CAL, TKR, INT and test suites. –Supported data taking, trigger and E2E script development. –Problem assessment and fixes a large part of online workload NCRs, support for clean room operations, support of subsystems scripts. –CCB activity and JIRA maintenance Last Month's Accomplishments (4 of 4)

6. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 6 Single Tower I&T Sequence Install TKR in single bay Install CAL in met bay Install TEM/TPS in met bay Install CAL/TEM/TPS In single bay TKR LPT (optional) CAL CPT TEM/TPS LPT (optional) Aliveness Test TKR CPT CAL CPT TKR LPT (14/22MHz) CAL LPT (14/22MHz) Trigger Timing Optimization Data Collection Van de Graaff Test Am 241 High Rate Test

7. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 7 Roadmap to Two Tower Testing Grid mini-IRR Rework GPR to Grid Brackets Reinstall Grid in Integration Stand Run Tower B LPT in Grid Install Tower B in Grid Bay 4 Grid Survey Install Tower A in Grid Bay 0 Run EGSE Validation in Grid Run Tower A LPT in Grid Install EGSE in Grid Two Tower Testing (ECD 4/28) Complete Tower B Single Bay Tests

8. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 8 Two Tower Test Plan as of 4/12/05

9. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 9 I&T MGSE/Grid Activities Weight and CG on Grid GPR return from rework Proof test completion GPR to Grid fit up Installing GPR and Grid in the Integration Stand Integration Stand in the cleanroom

10. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 10 Fit Check for ACD Clearance ACD in Place Before GPR Removal Potential Interference During GPR Removal

11. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 11 Final Grid weight & CG

12. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 12 TEM/TPS-B + FM105 integration

13. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 13 Two Tower Integration Installation of Tower A in Single bay Tower A in Grid. Tower B being installed in grid.

14. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 14 I&T and Tracker Teams - Two Tower Installation

15. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 15 What is SVAC doing in the next 6 Months Supporting SAS in the –Design, debug, and maintenance of infrastructure for data analysis Performing data analysis on instrument data (will elaborate on this today) –taken during the E2E and SVAC tests Coordinating the Collaboration effort through Instrument Analysis Workshops to –Disseminate the knowledge on how the hardware works –Disseminate the knowledge on how the software works –Create a foundation for ISOC to build on

16. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 16 Excellent Start… Calibrated muon peaks In units of MeV TKR only triggers TKR + Muon telescope

17. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 17 Event Trigger Rate CAL_LO only Am241 VDG 1 kHz 5 kHz 10 kHz 20 kHz 1 kHz Horizonta cosmicsl 4 range Zero Sup OFF 10 KHz 10 kHz VDG Rates agree with expectations

18. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 18 Error Events for Tower A Read TKR from one side only So far we found no packet or parity errors. Only FIFO TEM errors were found (OK) VDG

19. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 19 Lower TKR thresholds : Number of hit planes 0.22% < 6 planes 0.07% < 6 planes Run 135000894, ID 1/1, TKR DAC ~ 30 Run 135000896, ID 2/3, TKR DAC ~ 22

20. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 20 High Rate Runs Am241 (TKR and CAL are allowed to trigger) Only the pulse generator Is allowed to trigger (1 kHz) Run 135001024, ID 4/5 Run 135000990, ID 4/6

21. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 21 GEM Time Interval : High Rate Runs Run 135001024, ID 4/5 Run 135000990, ID 4/6 Run 135000909, ID 4/1 Run 135000915, ID 4/2 Am241 @ 5 kHz (TKR and CAL are allowed to trigger) Only the pulse generator Is allowed to trigger (1 kHz) TKR and the pulse generator are allowed to trigger (1 kHz) TKR, CAL and the pulse generator are allowed to trigger (5 kHz)

22. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 22 VDG Runs Tower boundary Reconstructed XY positions Fraction of events with 0 hits (red means 0 events) Very few events make into the thick layers ~ 80% of events have at least one track Run 135000946, ID 9/1 Trigger rate ~ 100 Hz

23. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 23 Process for Investigating Data Analysis Issues 1.An issue is presented in the Friday’s Instrument Analysis meeting 2.SVAC ensures its traceability by documenting it in JIRA 3.SVAC follows up with subsystems/Collaboration to develop a list of potential root causes: –Insufficient knowledge/documentation of data analysis files –Could be just a calibration issue or lack of understanding of how data analysis variables are being filled –Software “Bugs” in three areas –in the data analysis software –in the online/offline software –in the reconstruction software –Insufficient knowledge/documentation of instrument operational settings –Could be just a feature given the current operational settings –Insufficient knowledge/documentation of instrument performance –Could be a not well understood/exercised capability of the instrument prior to the existence of integrated towers –Could be an environmental effect or “noise” external to the LAT, inherent ot the experimental set-up –Idiosyncrasies of ground cosmic ray spectrum 4.After step 3 is done, we can propose a special test to gather more data (if necessary) 5.Finally when we believe an issue points to a flight hardware problem, we 1.Present summaries in IA (Eduardo) or ANA (Steve) meetings, whichever happens first –Bring it to the attention of all relevant subsystems and recommend strategy to solve the problem 2.Document the issue with System Engineering and I&T for disposition

24. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 24 Current Issues under investigation CAL_HI and CAL_LO fired without any crystal hits CAL_HI trigger fired without high energy deposition Discrepancy between TKR multiplicities between DATA and MC in electronics space There is consistently 10-15% more triggers seen during the 5 and 10kHz runs than expected as measured by the exponential fit to the delta event time register of the GEM. TKR only triggers are around 85% (TBR) of the time when the muon telescope triggers Discrepancy between Data and MC for TKR dead channel list Discrepancy calculated and measured event size There seems to be a high incidence of reasonable looking events with both CAL low and CAL high without a TKR trigger. These events generally had plenty of hits in the tracker Discrepancy between GEM and TriggerAlg for trigger types Discrepancy in trigger rates for 1,5,10 and 20 KHz runs, underestimated for low rates and overestimated for high rates at a few % level

25. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 25 I&T NCRs by Month Open/Closed Status Month NCR Opened Current Status As of April 12th Last Month

26. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 26 Two Tower Test Preparation Open EGSE Item Status –PDU GASU support in the grid. Complete –Cable terminations at grid interface to EGSE MGSE complete. –EGSE locations (Test Crate and power supply). Location identified on Integration Stand Complete and installed –PDU Operational Constraints without SIU. Complete –Harness routings and tie downs. Concept for routing and tie downs discussed. Routings to be finalized on Grid.

27. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 27 EGSE Configuration for Two Tower PDU GASU

28. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 28 EGSE Configuration for Two Tower Test EGSE Support Shelf added in two locations

29. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 29 Upcoming I&T Events –Accept Grid from Mechanical Systems (Complete) –Acceptance test EM PDU (ECD 4/13) –Install Tower B in Grid (Complete) –Build 2 tower test cables (Complete) –Receiving Tracker Tower 2 (Complete) –Complete 2 tower test procedure (Complete) –Two tower test power supply ready (Complete) –Installation of all two tower EGSE in room 104 (ECD 4/15) –Integration of Tower A and B into Grid & functional test (ECD 4/13) –Two tower test (ECD 4/28)

30. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 30 I&T Detail Schedule (1 of 4)

31. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 31 I&T Detail Schedule (2 of 4)

32. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 32 I&T Detail Schedule (3 of 4)

33. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 33 I&T Detail Schedule (4 of 4)

34. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 34 I&T 9 Month Look Ahead (1 of 3)

35. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 35 I&T 9 Month Look Ahead (2 of 3)

36. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 36 I&T 9 Month Look Ahead (3 of 3)

37. GLAST LAT Project Managers F2F 041305 4.1.9 - Integration and Test 37 Issues & Concerns ISSUES Availability of flight assembly hardware. –Shortages identified by I&T and being worked with Subsystems. Flight Cables CONCERNS I&T Procedure Development –Two tower test procedure (4/15/05 Need date) Continued support from subsystems for NCR closure. Hardware delivery planning for Tracker –New supplier for flex cables is able to increase production how does it impact Tracker delivery TPS rework and replacement, availability for future tower installations. Need firm delivery dates for ELX boxes LATTE 5.0 ready Oct. 1 for use in LAT Functional testing due to start 10/14. E2E tests start 11/1.