2. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 1 GLAST Large Area Telescope: I & T Elliott Bloom SU-SLAC Subsystem Manager Brian Grist SU-SLAC Subsystem Engineer elliott@slac.stanford.edu, bgrist@slac.stanford.edu 650-926-2469 650-926-2998 Gamma-ray Large Area Space Telescope

3. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 2 Outline  Overview  Results from January PDR/Baseline review  Findings and recommendations  Actions since the review  Schedule and Budget (Brian Grist- I&T chief engineer)  New technical issues  Summary

4. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 3 I&T Organization Chart I&T Engineer B. Grist (SU-SLAC) WBS 4.1.9.1 Reliability & QA D. Marsh (SU-SLAC) WBS 4.1.9.2 Environmental Test Manager M. Lovellette (NRL) WBS 4.1.9.8 Online Software R. Claus (SU-SLAC) WBS 4.1.9.5 Science Verification, Analysis, and Calibration E. do Couto e Silva (SU-SLAC) WBS 4.1.9.9 Particle Test Manager G. Godfrey (SU-SLAC) WBS 4.1.9.7 Integration, Facilities, Configuration, and Test L. Wai (SU-SLAC) WBS 4.1.9.6 Instrument Operations Coordinator D. Lung (SU-SLAC)-acting WBS 4.1.9.3 Mechanical Ground Support Equipment E. Gawehn (SU-SLAC) WBS 4.1.9.4 I&T Manager E. Bloom (SU-SLAC) WBS 4.1.9 Mission E. Bloom (SU-SLAC) WBS 4.1.9.A

5. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 4 Level III Requirements Summary Science Requirements –Defined by Instrument Performance Spec 433-SRD-0001 I&T is using derived document LAT-SS-00010 –Verification will be performed by a combination of particle tests Cosmic Ray (muons) Van de Graff (18 MeV photons) SLAC End Station A Beam Test ( e +, tagged and brems , p) Design Requirements –LAT Instrument Performance Verification Plan, LAT- MD-00408 -- SE with input from I&T. –Subsystem ICDs -- I&T to all relevant subsystems, e.g., LAT-SS-00570 (I&T  SAS), LAT-TD-00623 (I&T  ACD). –Test methodology defined by 433-MAR-0004 –Instrument Verification will be performed by Electrical Performance Tests Structural and Mechanical Tests EMC/EMI Tests Thermal Verification Tests Visual Inspection Instrument Monitoring End-to-end test (at ~ 35,000 ft in a jet airplane during transport to NRL for environmental tests) Produce a Working Instrument

6. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 5 Integration and Test Activities I & T “subsystem” is focal point of LAT integration activities. –I & T team plans and manages activities. –TKR, CAL, and ACD subsystem teams and other Collaboration members provide support for Integration & Test & Calibration. Total I & T effort involves activities in I&T and other subsystems. –I & T Subsystem activities. LAT integration planning and management. Mechanical integration and MGSE and EGSE development. Plan environmental tests and execute. Plan particle tests and execute. Particle beam and test equipment development. Ground verification and calibration of LAT. Ground science verification of LAT. Phase 0 commissioning of LAT in orbit -- deliver a working instrument to IOC.

7. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 6 GLAST Integration Area – Building 33 SLAC LAT I&T LAT Assembly Clean Room Subassembly Preparation Clean Room 5 Ton Crane Gowning Room Office Area EGSE Room Receiving Area Non-critical storage / technician work area

8. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 7 IFCT : Facilities Revision date: 17 July 2002 SLAC Building 33: LAT Assembly Facility 1.Air conditioning: final checkout in July 2.ESD: minor tile replacement in August 3.Floor plan: lock and key plan approved by fire and security, installation complete 4.Backup nitrogen purge: SLAC safety review complete, plumbing complete, oxygen sensor installation in August 5.Building acceptance review: plan for September NRL Building A59: Payload Checkout Facility 1.Initial site survey w/ MGSE engineer completed July 9, 2002 2.Universal Support Stand will be used for assembly at SLAC and for most environmental tests at NRL

9. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 8 Anticoincidence Detector (ACD) Mass228.1 kg (May 2002 est.) MaterialsCFC honeycomb, alum base frame, MLI/ Micrometeorite Shield Size1796 mm w x 1015 mm h InterfacesGrid bolted joint, shear pins Grid/X-LAT Plate/Radiators Mass295.3 kg (May 2002 est.) MaterialsAluminum, heat pipes, alum honeycomb plates Size1566 mm sq x 236 mm h InterfacesFour-point mount to SC flexures Calorimeter (CAL) Mass1466.3 kg (May 2002 est.) MaterialsCFC support shell, alum structure, CsI Size364 mm sq x 224 mm h InterfacesGrid bolted friction joint Tracker (TKR) Mass504.9 kg (May 2002 est.) MaterialsGrEp, CC structures, Silicon, Tungsten Size372 mm sq x 640 h InterfacesGrid Ti flexure mount LAT Structural Design Parameters DesignSpec Mass2699 kg<3000 kg Center of Gravity154.5 mm<185 mm Width1796 mm<1800 mm Height1047 mm1100 mm LAT Structural Performance DesignSpec LAT First Mode Freq.55.5 Hz>50 Hz LAT Drumhead Freq.60.2 Hz>50 Hz Radiator First Mode Freq.65.1 Hz>50 Hz Deflection at Grid Center0.49 mm--- Electronics Mass204.4 kg (May 2002 est.) MaterialsAluminum Sizemm sq x mm h InterfacesFlexure mount to CAL; bolted friction joint to X-LAT Plate LAT Mass Budget and Current Estimates (kg) EstimateBudget TKR504.9510.0 CAL1466.31480.0 ACD228.1235.0 Mech295.3323.0 Elec204.4220.0 LAT Total2699.03000 Source: LAT-TD-00564-3 “LAT Mass Status Report Mass Estimates for May 2002” LAT Structural Overview LAT Structural Design Overview

10. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 9 Design Details Grid corner detail showing embedded heat pipes, purge grooves; corner chamfer and bottom flange for ACD, Radiator Mount Bracket X-LAT Box assembly: X-LAT (red) and Mid- Plate (pink); Radiator Mount Brackets at corners, and removable EMI Skirt pieces (blue) Radiator Mount Bracket at Heat Pipe Patch Plate detail. Radiator Mount at Grid corners. Note widened SC mount boss and bottom flange

11. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 10 Details of LAT Underside Grid Box corner, showing X-LAT Plate (lt green), Heat Pipe Patch Plate (dk blue) Detail of EMI Skirt around SC support region Detail of TEM and TPS boxes (red), with crenulated CAL plates (dk blue) Electronics boxes mounted to CAL plates (dk blue)

12. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 11 I&T Mechanical Ground Support Equipment Key GSE pieces –Universal Support Stand Holds Grid at corners for LAT Assembly Rotation provided by Motor / Gearbox Assembly Vertical motion by Crane Operation Used during Engineering Test Model build and during most Flight LAT Environmental Tests –Shipping Box Environmentally controlled for temperature and humidity control, as well as process heat removal Able to operate LAT while in the box for in-flight testing –VanDeGraf Generator Source of low-energy gamma rays for calibrating location of modules during integration Grid Perimeter Ring Rotation Drive Motor- Gearbox-Sprocket Assy Corner Attach Brackets, 4 PL Six Foot Tall Person LAT Grid in the Universal Support Stand

13. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 12 MGSE MGSE Development Manager joined LAT I&T May 02 Reviewed MGSE Hardware Lists and Respective Requirements Defined complex items to determine if schedule / cost issues exist –Budget appears in line with hardware complexity –Schedule requires more detailed evaluation / minor updates possible Most complex items are: –Universal Support Stand with Grid Perimeter Ring and Radiator Support –X, Y,  Table for Calibration Unit ESA Beam Test –Alignment Fixtures for Calorimeter and Tracker Tower installation –Vibration Test Fixture Duplicate Items –Require Two Universal Support Stands due to timing of Calibration Unit ESA Beam Test and Parallel Integration of the LAT –Environmental Control Cart; May require Back-Up System due to Dew Point Control Requirements Imposed by the Calorimeter

14. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 13 1.EM Support / Rotation Fixture 1.Also Used to Rotate Calorimeter 2.EM Lifting Fixture *1 3.EM ACD Scintillator Support Fixture 4.Calorimeter Lift Fixture (used for Alignment to LAT after Rotation) 5.Calorimeter Alignment Fixture *2 1.Includes 0.45 m long Alignment Rods 6.Calibration Unit (1 x 4) Support Fixture 7.Calibration Unit Lift Fixture 8.Calibration Unit ACD Support Fixture 9.Calibration Unit X, Y, θ Table (for Beam Test) *2 10.Thermal – Dew Point Control Tent (Double Walled) 11.CU & LAT Thermal Control Cart Ducting, Hoses, Cold plates *2 12.Grid Perimeter Ring (In P3 as Universal Handling 1.Supports Grid Through Entire Integration & Test at SLAC 2.Supports LAT in Shipping Container (To Protect SC Bus Interfaces 3.Used at NRL for EMC, Acoustic and Thermal Balance Tests Hardware Development List Note:*1 - Tracker Tower Lift Fixture Supplied by Tracker Sub-System, *2 – Trade Study In Work

15. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 14 Hardware Development List, Continued 13. Universal Support Stand – A 1.Supports GPR and LAT During I & T 2.Lifted by Crane Ops 14.Universal Support Stand – B *2 1.Supports GPR and LAT During I & T 2.Provides Lift & Rotation Capability 3.May be Required Due to Parallel LAT Build and Calibration Unit Beam Test 15.Extension 1 x 4 to 4 x 4 1.Allows 1 x 4 CU to be Installed into USS – A or B 2.Allows Integration Concept Protocol Development and Physical Demonstration 16.LAT Shipping Container 1.Insulated for Thermal Cycling Tests 2.Includes Electrical Feed Throughs to Power up & Receive Data from LAT 3.Includes Ducting for Thermally Controlled Air Circulation 4.May Include transits for use of cold plate on X-LAT Heat Plate

16. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 15 Hardware Development List, Continued 17.Staging Table 1.Preparation / Sub-System Functional Tests 18.Vibration Test Stand 1.Provides Interface Between NRL Vibration Table and LAT to SC Bus Attach Points 2.Single Stand Will Support All Three Axes 19.Thermal Vacuum Support Kit 1.Supports Radiators on USS – A 2.Replaces High Off-Gas Items (i.e., Delrin Bushings and Structural Caps) 3.Includes Container for USS – A’s Rotator Drive Assembly, Rotator Bearing and its Wheels 20.Van de Graf Mounting Stand 21.Van de Graf Radiation Containment 22.Calorimeter Transport Box 1.Includes Dry Air Purge Connect to Control Humidity During Transit to ESA 23.Miscellaneous equipment and Fixtures 1.Budget Line to Capture Incidentals

17. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 16 MGSE Trade Studies Trade Studies 1. Calorimeter Alignment installation 2.X, Y,  Table

18. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 17 MGSE Status Performed NRL Site Survey to Ensure Hardware Concepts are Consistent with Environmental Test Facility –No Issues Mature MGSE suite List (see prior charts) Indentured Drawing List Prepared for All MGSE – 90% Complete –Mature Enough to Proceed to Concept Review Level III MGSE Concept Review Planned for Sept. 02 –Validate Understanding of MGSE Requirements –Obtain Concurrence from Science that Hardware Meets Their Needs –Obtain Level III Buy-In and ATP for MGSE Development Approach

19. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 18 Integration Planning: GSE (1) Grid Perimeter Ring (GPR) 1.Includes brackets to support Grid at Grid corners and at SC Bus Interface 2.Grid Corner attachment via Grid Radiator attach bracket 3.Bracketed to Grid at Receipt 4.Stays with Grid through entire SLAC I&T Activity and through Aircraft, EMC and Thermal Vacuum Tests 5.Includes interface for Radiator Support Structure 6.Attaches to Universal Support Stand for Integration and Test processing (i.e., controlled short lifts and rotations) 7.Removable GPR to SC Bus interface brackets used during all shipments to uniformly distribute loads 8.GPR is used to “hand” LAT off to SC Bus (i.e., it is then part of the Lift Fixture) Grid Perimeter Ring SC Bus Attach Brackets, Short, 2 PL SC Bus Attach Brackets, Long, 2 PL Corner Attach Brackets, 4 PL Rotation Bearing, 2 PL; Drive on One Side

20. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 19 Integration Planning: GSE (1) Rotation Drive Motor- Gearbox-Sprocket Assy Sprocket Attaches to GPR Drive Shaft During Crane Op Removable Wheels for Thermal Vac Tests Universal Support Stand A 1.Supports Grid Perimeter Ring / Grid 2.Rotation by Motor / Gearbox Assy 3.Vertical motion by Crane Ops 4.Used during Engineering Test Model build and during most Flight LAT Environmental Tests (i.e., not used during Vibe Test)

21. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 20 Integration Planning: GSE (1) Revision date: 22 July 2002 Universal Support Stand B for CAL Mod 1.Same as the ‘USB - A’, but includes motorized lift and position encoder capabilities 2.Can support ESA Beam Test due to automated lift and rotation capability 1.Existing Design Concept would need Positional Encoders added (< $10K for Computer, Encoder Strips and Reader) 3.Trade Study in work to determine if modification of used large metal working equipment is lower cost option with acceptable risk

22. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 21 Mechanical Ground Support Equipment Plans ACD-to-Grid mating –4 attachment points at corners of BEA (in definition) –Plan to mate ACD to Grid using alignment tooling and precision crane operation (not enough headroom for Hydro set) Radiator mounting –2 attachment points per Radiator at Radiator Mount Bracket –Radiator capable of integration using a precision crane, in either Z-up or X-up orientation

23. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 22 IFCT : Assembly Documentation Revision date: 17 July 2002 1.“I&T Integration Sequence, MGSE, and Flight Work Instruction Development Plan” (LAT-TD-00676-03) completed 2.Working draft for “Single Tower I&T Work Instructions: Engineering Models” 3.Test model for work instruction checklist electronic sign-off completed 4.Flight Work Instructions will build directly from Engineering Model Tower assembly

24. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 23 IFCT : Functional Test Development Revision date: 17 July 2002 1.Oversight of tracker, calorimeter, and ACD functional test script development through weekly online meetings 2.EGSE workstation operational 3.Delivery of TEM & associated equipment by August 4.Functional tests of tracker and calorimeter electronics by December 5.Simulated cosmic muons in single tower engineering model completed 6.Plan for development of tracker – calorimeter event matching test software

25. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 24 I & T Responsibility LAT I&T, Verification, and Calibration Flow VibeRandom vibrate/sine sweepAccAcceptance test level AcAcousticQUQualification Unit T-CThermal-cycle at 1 atmosphereEMEngineering Model T-VThermal-vacuum cycle testTMThermal model EMIElectro-magnetic interference testCUCalibration Unit FUFlight Unit Calibration unit I&TCalCalibration Flight unit/spares I&TFS Flight Spare I&T: Beam test CU – 4 towers Cal Elec: EM2 Elect. Modules TKR: QU FS from TKR fab CAL: F1-2 from CAL fab CAL: QU- FS from CAL fab TKR: F1-2 from TKR fab Calibration Unit - CU Obs: Support Vibe/Ac Acc Obs: Support T-V Acc Obs: Support EMI Acc I&T: LAT Assembly, Test Acc, Cal Elec: Flt Elec. Mod. to LAT I&T CAL: F3-16 from CAL fab TKR: F3-16 from TKR fab Mech: Flt Grid from Mech ACD: ACD to LAT I&T Flight LAT - FU I&T: LAT Functional, Thermal, Airborne cosmic E to E Acc, Cal, T-C TKR/CAL: F1,2 from CU I&T: LAT Environmental Tests Acc, Cal, T-V Elec: Q SIU for EGSE Mech: Flt Rad’s from Mech

26. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 25 Grid After Dimensional Inspection and Static Load Test Lift Grid using SC Bus Lift Points Attach Grid to Grid Perimeter Ring at Corner Attach Points Top Looking Down View Integration sequence (1): Grid Prep

27. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 26 Crane Op TKR into Position, Shim & Torque Rotate Grid Crane Op Calorimeter-TEM & Power Supply into Position and Torque Verify Function with Cosmic Rays Before Assembling Next Bay Rotate Grid Integration sequence (2): Single Tower Integration

28. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 27 Integration sequence (3): Tower Survey

29. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 28 1.Survey during LAT integration to verify workmanship a.Laser tracker reflectors in 4 corners of each top Tracker Tower b.Laser tracker reflectors on sides of Grid 2.Survey Tracker Baseline using cosmic muon data a.During SLAC Reference Comprehensive Performance Test b.During Airborne Cosmic Test c.During NRL Thermal Vacuum Cycling Test 3.Routine survey Tracker Baseline in orbit using cosmic muon data. LAT survey issues

30. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 29 Integration sequence (4): Electronics Integration

31. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 30 After all 16 Bays Have Been Loaded, Lower Grid Assy Precision Crane Op ACD into position and Torque Raise ACD-Grid Assy in Prep for Rotation Rotate & Lower ACD-Grid Assy, Then Install Remaining Electronics After Performance Validation with Cosmic Rays, Install X-LAT Heat Plate After X-LAT Heat Plate Installation, Rotate and Validate with Cosmic Rays Integration sequence (5): ACD and Cross-LAT Plate

32. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 31 Integration sequence (6): Reference Comprehensive Test

33. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 32 Integration sequence (7): Transport to NRL

34. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 33 Integration sequence (8): Unpack, EMC/EMI Test

35. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 34 Integration sequence (9): Random Vibe, Sine Sweep Tests

36. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 35 Integration sequence (10): Interface radiators, Acoustic Prep

37. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 36 Integration sequence (11): Acoustic Test, Prep for Thermal

38. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 37 Integration sequence (12): Thermal Balance Test

39. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 38 Integration sequence (13): Remove radiators, prep for cycling

40. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 39 Integration sequence (14): T-Vac Cycle Test

41. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 40 Integration sequence (15): Transport to S/C Contractor

42. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 41 Integration Planning Integration interfaces –Primary interface is to the Grid Perimeter Ring –SC mount point is used as primary support for shipping and vibration testing Surveying issues –Surveying will occur during LAT integration to verify workmanship Laser tracker reflectors in 4 corners of each top Tracker Tower Laser tracker reflectors near on perimeter of Grid –Surveying of the Tracker module relative alignment will use cosmic muon data to establish and check Baseline alignment During SLAC Reference Comprehensive Performance Test During Airborne Cosmic Test During NRL Thermal Vacuum Cycling Test –Routine surveying of the Tracker Baseline in orbit using cosmic muon data will be used to update calibration constants during the mission

43. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 42 Integration Planning (Cont) Issues being worked –Integration Access vs size/stiffness around the Grid Perimeter Ring Maintaining humidity requirement during bench-top thermal testing Surveying lines-of-sight and location of fiducials –Handling/Transportation Shipping container and shipping loads Cleanliness and access during beamline tests

44. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 43 LAT Design and I&T Plans LAT Mechanical Systems design features to aid I&T –GSE mount points in corners free SC mount region –Purge grooves are built into Grid, to allow for inside-out purging –Heat pipes arrayed only in planes parallel to the LAT YZ-plane, allowing for full thermal verification of the LAT with Radiators Impact of Mechanical Systems changes to integration and test plans –LAT now must be thermally tested on its side (not upright or inverted) –Additional Radiator supports and heat pipes below the Grid block access to electronics boxes. This impacts the ability to service the boxes after integration –Radiators overlap the Grid now, making their integration and removal more difficult

45. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 44 LAT Design and I&T Plans (Cont) I&T load cases for LAT Mechanical Systems –Structural Airplane transport –acceleration and shock loads levels are TBD –should be bounded by launch loads Truck/ground transport Integration configuration static loading –Universal Support Stand can position the LAT in upright, sideways, and inverted orientation –exact sequence of module integration needs to be studied from structural viewpoint –Thermal Extreme shipping environment In-air functional bench-top testing –heat pipes don’t function upright, so alternate cooling methods are needed In-flight functional test –Heat pipes will not function out of horizontal, so alternate cooling methods are needed

46. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 45 Division of Responsibility GLAST Mission –Coordinate with spacecraft vendor EGSE LAT –Coordinate EGSE flow across subsystems ELECTRONICS –EGSE hardware (except for workstation) & front end software I&T –EGSE workstation, workstation software and support. I&T test, analysis, visualization, and script software SAS –LAT event reconstruction software IOC –Ultimate customer Elect.I&T Mission LAT IOCSAS ONLINE

47. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 46 EGSE Deliverables (Electronics + I&T Support) Software support for various incarnations of I&T test-stands –Engineering Model 1 (EM1) –Engineering Model 2 (EM2) –Calibration Unit (CU) –Flight Unit (FU) Test-stand system composition –Infrastructure (workstations, networking, crates, etc.) –Test executive –Graphical User Interfaces (GUIs) –Databases and tools –Data analysis tools –Data archiver –Test procedures –Code management, release control and distribution –Remote debugging tools

48. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 47 Test-stand Architecture Integration & TestElectronics Subsystem EGSE Hardware (Hardware and Real-time software) Online Workstation (Hardware and Software) Subsystem/ System Under Test Interfaces Ethernet Instrument Operations Coordination

49. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 48 EM1 EGSE Configuration VME/cPCI Chassis LAT-COMM Electronics/OnlineSubsystem/simulator Subsystem (or simulator) AEM/TEM Ethernet Router and Firewall Ethernet Main Dataflow Ethernet Back door debug RS-232 WAN Online Workstation CPU Central Database DC Power

50. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 49 EM2, CU, FU EGSE Configurations Online Workstation Electronics/Online cPCI Chassis CPU 1553 DC Power I/O SolidStateRec I/F T&DF System Cal Unit, LAT or Sensor Simulator AEM/TEMs Ethernet Router and Firewall Ethernet Back door debug RS-232 WAN GLT SIU EPU Spacecraft (or Simulator) Main Dataflow Command & Monitoring Central Database

51. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 50 EGSE & Online Software Real-time system –Embedded processors running the VxWorks RTOS –Data acquisition and control by Trigger & Dataflow system –Monitoring and control of Housekeeping items –Data acquisition from test-stand COTS I/O modules Command and monitoring software (test executive) –Using Interface & Control System, Inc.’s (ICS) Spacecraft Control Language (SCL) Data acquisition, quality verification, archiving and distribution Data visualization and analysis –SCL provides some help with these last two items –Third party COTS and Open Source software packages have been, or can be interfaced with SCL to provide the complete solution

52. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 51 Tasks Acquire and configure test-stand hardware Workstation (NT) Embedded processor (VxWorks) Interface electronics Communication between embedded system and workstation Interface to I/O hardware LAT-COMM TEM/AEM Other (PSA, LCB, GPIB, Industry Packs, etc.) Application SCL database layouts Command and Monitor User interfaces (LabVIEW) Interface to SCL –Displays Local database (MS Access) Interface to SCL –Schemas Central Database (Oracle) –Mechanism to upload local database contents Persistent event data storage

53. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 52 Tasks, continued Event data navigation tools Data visualization and analysis tool(s) Working decision is to use HippoDraw. Root and/or IDL may come later. –Interface to SCL Work with subsystems to construct I&T procedures –EM1 –EM2, CU, FU Deploy I&T test-stands and software to subsystems Educate and train end users Integrate orthogonal data sources with test-stand data stream –Muon telescopes, photon taggers, etc. Online/Subsystem ICD –Draft 2 almost complete Hold weekly Online/Subsystem meetings Support Flight Software and Electronics needs Support Instrument Operations Center (IOC) needs Code management and version control system Software release distribution

54. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 53 LAT Science Requirements Verification Matrix Requirements for Beam Tests flow down from –LAT Science Req Doc – Level II Specification LAT-SS-00010-1 (LAT-SS-10.1) Req’t #Req’t TitleParameter Verification Method T=Test A=Analysis Beam Tests Relevant to Verifying the Requirement 5.2.1Energy Range/ Effective Area At Normal Incidence: > 300(TBR) cm 2 @ 20 MeV >3000 cm 2 @ 100 MeV >6400(TBR) cm 2 @ 300 GeV T and A 1) Van de Graf 17.6 Mev  2) Tagged photons 20 to 1500 Mev, norm incidence 3) Brem beam, simultaneously all  energy bins from 20 Mev to 30 Gev, variety of angles and transverse positions. 4) Cosmic rays in airplane 5.2.2Energy ResolutionOn axis:  50 % (TBR) 20–100 MeV  10 %.1-10 GeV  20% (TBR) 10-300 GeV T and A 1) Van de Graf 17.6 Mev  2) Tagged photons 20 to 1500 Mev, norm incidence 3) Positrons 1,2,5,10,30, 45 Gev, variety of angles and transverse positions 5.2.3Peak Effective AreaAt Normal Incidence: >8000 cm 2 T and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 2) Cosmic rays in airplane. 5.2.4Effective Area Knowledge  A/A, 1  <50% 20-50 MeV <25%.05-300 GeV T and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 5.2.5Single Photon Angular Resolution – 68% (on- axis) < 3.5° front @ 100 MeV < 6° back < 0.15° front @ 10-300 GeV < 0.3° back T and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 2) Tagged photons 20 to 1500 Mev, norm incidence 5.2.6Single Photon Angular Resolution – 95% (on- axis) < 3 x  68% On-Axis T and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 2) Tagged photons 20 to 1500 Mev, norm incidence 5.2.7Single Photon Angular Resolution (off axis at FWHM of FOV) < 1.7 times on-axisT and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 5.2.8Field of View> 2 srT and A 1) Brem beam, simultaneously all  energy bins from <20 Mev to 30 Gev, variety of angles and transverse positions. 5.2.11Time AccuracyBetter than 10 usecT and A1) All Beam Test events record time from Linac RF 5.2.12Background Rejection>10 5 :1 (TBR)T and A1) 200 K protons (Pattern rejection) 2) Cosmic rays on the ground (ACD rejection) 5.2.13Dead Time<100 (TBR) usec per eventT and A1) Ground cosmics 2) All Beam Test runs 3) Airplane cosmics

55. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 54 What Calibration Means Instrument calibration –Parameters are directly calculated from the data –examples ADC chan / MeV response of each CsI crystal Which strips are dead in the tracker Timing accuracy (See LAT-MD-00446 “SVAC Plan” for full list) Calibrate the GLAST Monte Carlo Simulation –Record LAT data for many particle types (e,p,  ), energies (20 MeV to 45 Gev), angles of incidence (θ), and positions (x,y) of entry. See LAT-TD- 00440 “Beam Test Plan”. –Compare data to simulated events and modify simulation if needed. Science calibration –Use the calibrated simulation to demonstrate compliance - examples Effective area as a function of energy. Point spread function versus energy and zenith angle. (See LAT-MD-00446 “SVAC Plan” for full list)

56. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 55 Beams Cosmics rays on the ground –EM, CU, LAT Van de Graff (17.6 Mev  ) –EM, CU, LAT End Station A positrons (1-45 Gev) –CU End Station A tagged photons (20-1000 Mev) –CU End Station A brems photons (20 Mev – 28 Gev) –CU End Station A protons (~12 Gev) –CU Cosmic rays in airplane (25,000 - 35,000 feet) (few hours) –LAT

57. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 56 Ground Cosmics Each tower as it becomes available at SLAC –~10 6 muons @ ~20 Hz x 1 day (use 3 in-a-row tracker trigger) –Natural cosmic solid angle distribution. No muon telescope. Four Tower Calibration Unit Full LAT –~10 8 muons @ ~300 Hz x 4 days (using 3 in-a-row tracker trigger) –Calibrate individual CsI xtals ADC chans/MeV Positional dependence –Calibrate tracker Dead and noisy strip map Straight tracks survey relative tray and tower positions –Calibrate ACD ADC chans / MeV Calibrate discriminator thresholds Efficiency vs position –Trigger and DAQ Search for problems Efficiency vs position

58. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 57 Van de Graff (450 keV) P + Li 7  Be 8 (1+)*  Be 8 +  (17.6 MeV) (~1 Hz into 2  sr) EM tower and qualification towers –Calibrate energy response and resolution –10 4 photons/tower @.1 Hz x 1day Full LAT –Only known energy  the full LAT DAQ will see before orbit Xtal Ball spectrum. Sum of 37 NaI xtals. ~1800  in the 17.6 MeV peak. It’s 7% FWHM is due to the resolution of the detector. The bump at ~12 MeV is due to a broad excited state of Be 8.

59. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 58 Measurement Strategy First, calibrate Four Tower Calibration Unit energy response –1– 45 Gev e+ with variety of x,y,θ (6 days) (small extrapolation to  with MC) –20-1500 Mev tagged photons at normal incidence (2 days) –17.6 MeV  from Van de Graff Second, take photon data for calibrating the simulation. –Bremsstrahlung  beam at one e + energy (28 Gev) ( 20 days) –Simultaneously measures all  energies from 20 Mev to 28 GeV –Bremsstrahlung spectrum has equal numbers of  per % width energy bin. –The already energy calibrated LAT bins the photons into ±25% energy bins. –An example of bin edges= [GeV] –.017,.026,.038,.057,.086,.129,.19,.29,.44,.65,.98, 1.5, 2.2, 3.3, 5.0, 7.4, 11, 17, 25 GeV Third, take hadron data for calibrating the simulation and measuring the pattern cut rejection factor. –~200 K protons @.0044 /pulse x 30 Hz x 30 days x.58 accelerator efficiency –This is the number of protons we recorded in 30 days in Beamtest 99.

60. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 59 Runtime Table

61. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 60 Schedule Beam Test: Apr 12-June 12, 2004 (includes the 6 month slip)

62. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 61 End-to-End Test in Airplane (using Cosmic Rays) Full LAT in an airplane (during airplane ride to NRL environmental test) L1T trigger rate measured in single tower during Balloon Flight At 25,000 feet verify the flight hardware at orbital L1T rates –The BFEM was 1/25 of a full LAT. Scales by MC to ~17 x 540 = 9.2 kHz of L1T. –Test DAQ performance –Software filter handles the rate and produces the expected downlink rate –Livetime is accurately measured At 35,000 feet test the flight hardware at > orbital L1T rates –~22 kHz saturates the LAT trigger –Test DAQ performance Alt [feet] L1T [Hz] Notes 025Ground 25,000540Same rate as in orbit 35,000900Airplane flight 50,0001175Pfotzer max 127,000540~Orbital rate

63. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 62 LAT Performance Specifications Science Verification, Analysis and Calibration (SVAC) System Calibration Data AnalysisScience Verification GLAST LAT SVAC Plan LAT-MD-00446 LAT-SS-00010 Science Requirement Document 443-SRD-00010 ACD, CAL, TKR Specifications LAT-SS-00016, LAT-SS-00017 LAT-SS-00018, LAT-SS-00152 LAT-SS-00152,LAT-SS-00210 Level II Levels III and IV APPROVED and SIGNED ! Mission deliverable Basis of all SVAC work

64. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 63 SVAC Overview I&T Flow Instrument Calibrations EM Prototype calibration tools and procedures Instrument Calibrations CU – Beam Test Science Verification CU - Beam Test MC Validation CU- Beam Test Instrument Calibrations LAT Instrument Calibrations LAT – Environmental test Calibrated LAT Instrument SVAC Calibration Products SAS Instrument Response Functions On orbit Calibrations IOC

65. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 64 SVAC System Responsibilities Capture Science and Calibration requirements from Subsystems Plans Prepare the SVAC plan (with continuous review from subsystems) To verify Science and Calibration Requirements Provide the final I&T calibration products to SAS and IOC Develop Calibration Compliance Matrices for pre and pos launch operations Coordinate Data Analysis (with support from subsystems) using data obtained from particle beams and cosmic rays during LAT assembly, environmental, airplane and spacecraft integration tests Demonstrate that the LAT is calibrated prior to launch and perform the first on-orbit calibration prior to hand off to IOC

66. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 65 Particle Tests SVAC data come from tests on several hardware units at different stages during the LAT integration Hardware Units Engineering Model (EM1) 1 tower Flight Modules (FM ) 1 tower Calibration Unit (CU) 4 towers LAT 16 towers Cosmic Ray Tests EM1, FM, CU, LAT Particle Beam Tests CU Environmental tests LAT Airplane tests LAT Spacecraft Integration LAT (delivered by subsystems) (managed by I&T Particle Tests – G. Godfrey) SVAC Input Data

67. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 66 SVAC Timeline Low and High Level calibrations Prototype algorithms and database Prototype interface with EGSE and SAS 2003 Engineering Model 1 Final alignment Validation of on orbit calibration scheme Calibration dependence on environment Calibration time history prior to launch 2004 2005 LAT Science Verification (Monte Carlo Validation) Low and High Level calibrations (inter tower alignment) Validation of SVAC database design Validation of on-orbit low level calibration scheme 2004 Calibration Unit

68. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 67 SVAC Developments since PDR - I Organization SAS/SVAC - Host joint calibration meetings between SAS and I&T reference datasets - Now meeting with Italian collaborators to discuss interface for reference calibration datasets for the Engineering Model Documentation SVAC Plan – LAT-MD-00446 - approved and signed, it is the basis of the developments within SVAC. Includes validated list of calibrations. ICD with SAS – LAT-SS-00570 - approved and signed, SAS is the main interface for SVAC. Defines interface for FY02 activities SVAC Plan for the EM – LAT-MD-00530 - draft being reviewed, it is the basis of the developments of SVAC activities for the Engineering model. Alignment and Monte Carlo (MC) Simulations Alignment - Preliminary results on alignment using the Balloon Flight Engineering Model data. Alignment Plan now under development. MC for beam test– Preliminary results for photon distributions for the Calibration Unit beam test (will be used to confirm estimated run time) Low Energy Photons - currently studying energy distributions for the EM

69. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 68 SVAC Developments since PDR - I Cont Software development and overall support Old Simulation (pdrApp) - implemented infrastructure for generation of simulated events at the SLAC linux farm for current studies New Simulation (GLEAM) - studying new software code from SAS for MC simulations (NT) and participating in SAS code reviews. Geometry for Simulation – developed documentation scheme in conjunction with SAS. Now preparing documentation and implementation of EM geometry. Database Client and server software - developed, implemented and tested a prototype database concept Table schema – currently developing table schema for the Engineering Model using Calorimeter as prototype EGSE interface Data format - being handled now by Online EGSE scripts – Started discussions with IFCT to inherit EGESE scripts that may be needed for calibration

70. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 69 SVAC Impact from schedule changes Engineering Model activities No significant impact CDR Will have more time to prepare for CDR Calibration Unit activities Delayed preparation of final drafts of documentation (since it is too early to capture correctly all requirements) ICD with SAS is ready for signatures, but this delay implies that the ICD will have to be revisited some months later. Delayed beginning of some activities related to new Monte Carlo Simulations.

71. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 70 Verification Test Planning LAT Tests –SLAC Beam Test using Calibration Unit De-humidification/cooling system for SLAC Beam Test Calibration Unit Grid ( 1 X 4), Remote X, Y, Θ Motion Table –SLAC Reference Comprehensive Test / Airborne Cosmic Test De-humidification/cooling/heating system for shipping container Ship w/o radiators (to fit in aircraft with LAT +Z up) –NRL Environmental Tests EMC/EMI – on Universal Support Stand Random Vibe / Sine Sweep – on Vibe Test Mount Acoustic Test – on Universal Support Stand Thermal Balance in Vacuum – on Universal Support Stand with radiators Thermal Vacuum Cycling – on Universal Support Stand without radiators

72. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 71 Verification Test Planning (Cont) Test issues being worked –Thermal-vacuum Test Heat leak and differential expansion of support stand –Vibration Test Structural stiffness requirements of Vibe Test Mount Testing w/ or without Radiators, and impact on LAT verification –Acoustic Test Testing w/ or without Radiators, and impact on LAT verification.

73. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 72 LAT Test Plan Contents

74. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 73 LAT Test Requirements

75. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 74 LAT Test Performance Process

76. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 75 LAT Planned Thermal Test Levels Predict Min. AT level for performance Min. QT level for performance Proposed test level for workmanship +5 o C analysis margin +5 o C +10 o C T = 60 o C T = -40 o C Proposed test level for workmanship Min. AT level for performance Min. QT level for performance -5 o C analysis margin -5 o C -10 o C* (*) -5 o C if thermally controlled AT = Acceptance Test QT = Qualification Test LAT Thermal Verification Test Strategy LAT Thermal Verification Test Temperatures

77. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 76 LAT Test Sequence

78. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 77 LAT Test Sequence w/ Electrical Performance Tests

79. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 78 LAT Thermal Vacuum Profile

80. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 79 LAT Verification Matrix ( TBR to new MAR )

81. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 80 I&T Status PDR Presentations Complete. PDR Report Complete. Design Products Defined. The I&T Management Staff Buildup Begun in Late August is Complete. EGSE Level III Requirements Complete. EM1 EGSE R1 Delivery Milestones are Complete. I&T Contamination Control Implementation Plan Complete (TBR). Calibration Plan Complete (TBR). Particle Test Plan Complete (TBR). Airplane Cosmic Ray End-to-End Test Plan Complete (TBR). RFI for Commercial Air Transport of LAT to NRL complete. RFI for Environmental Tests of LAT complete. Integration and Electronics Integration Plan Complete (TBR). Revision 0 Assembly Traveler Available (TBR). New WBS, Cost Estimate, BoE, P3 Schedule with Risk Assessment, Complete. Six month Schedule slip in P3. Preparations for EM assembly and testing (before CDR), and CDR underway.

82. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 81 Results from the January Review Findings and Recommendations from the Final PDR/Baseline Report: I&T Passed PDR. I&T was not Recommended for baselining. “The I&T subsystem’s technical design was deemed to be mature. The management structure appeared to be strong and the budget and contingency appeared to be adequate. The committee concluded that the I&T subsystem is at the PDR level but recommended against baselining this subsystem due to lack of a bottoms-up cost estimate and the newly reworked WBS.”

83. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 82 Results from the January Review (Cont) Findings, Recommendations, RFA responses: –Complete the reworked WBS with review and approval by project management by February 2002. Status: The reworked WBS has been completed. It is available through the LAT document system. –Complete the reworked cost and milestones with review and approval by project management by March 2002. Status: Agreed, Completed, and being presented at this review. –Recommend subsystem baseline review as soon as possible after the work on items 1 and 2 are complete. Status: Agreed and now in progress. –Write the integration and electronics integration plans and get them under configuration management by March 2002. Status: An integration and test plan is written. It is available and under configuration management- LAT-TD-00676-03.

84. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 83 Results from the January Review (Cont) Findings, Recommendations, RFA responses (Cont): –Write a baseline level plan for the airborne test by March 2002 and ensure that any requirements on the subsystems levied by this test are flowed to subsystem managers. Status: Draft completed.The airborne test plan, LAT-TD-00550-01, has been included in the integration and test plan. The integration and test plan will be reviewed and concurred upon by Systems Engineering and Subsystem Managers. –Rev 0 assembly traveler should be written and under configuration control before Qualification Unit A arrives. Status: Agreed, Draft 0 Completed, and available for this review. –Provide an initial, top-level estimate of the cost/schedule impact of replacing a Tracker tower after complete instrument assembly. (This AI was originally AI-Mech-03). Status: OPEN.

85. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 84 Summary Schedule

86. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 85 LAT Summary Schedule LAT Summary Schedule Electronics, DAQ Tracker Fab & Test Calorimeter Fab & Test ACD Fab & Test GRID Fab & Test Instrument I&T Calibration Unit Ship Instrument Observatory I&T Launch LAT Operations & Data Analysis FABRICATION PHASE COMMISSIONING PHASE 9/1/05 9/06 LAT Complete 5/25/05 } 14 wks Schedule Contingency

87. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 86 Key Need Milestones

88. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 87 Key Need Milestones

89. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 88 Key Need Milestones

90. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 89 Key Need Milestones

91. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 90 Key Available Milestones

92. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 91 Cost & Commitments

93. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 92 Cost Profile

94. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 93 Manpower Plan

95. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 94 I&T Issues Waiting for Spacecraft vendor to be selected and start work. EM model delayed, but we have adjusted to the new schedule. Reevaluation of EGSE executive software for EGSE EM2 and beyond. Will SCL do the job given what we have learned about its capabilities over the past 9 months and its fit to the flight hardware. Trade study underway.

96. GLAST LAT ProjectDOE/NASA Delta Baseline/Preliminary Design Review, July 30, 2002 Name Document: LAT-PR-#####-## 95 Summary