GLAST Large Area Telescope

Transcription

1 Gamma-ray Large Area Space Telescope GLAST Large Area Telescope Lowell A. Klaisner Stanford Linear Accelerator Center LAT Instrument Project Manager rev. 2 1

2 Status Transition from Design to Flight Hardware Design is mature Instrument Architecture frozen Some open engineering and manufacturing issues Costs reviewed US budget for the Fabrication Phase is $133 M DOE/NASA Joint Oversight Group approval International Finance Committee Infrastructure is in place Staff with experience in space instrumentation and experience in HEP detectors New integration and test facility at SLAC Working relationships between the NASA Mission Office, the LAT Project Office, Collaborators and foreign partners in place rev. 2 2

3 GLAST MISSION SUMMARY Objective: Larger field of view (FOV), higher sensitivity, and broader energy detection range than any previously flown gamma-ray mission. Mission Duration: 5 yrs (10 yr Goal) Orbit: 565 km Circular, 28.5 Inclination Launch Date: February 2007 Launch Vehicle: Delta 2920H-10 Launch Site: Kennedy Space Center rev. 2 3

4 GLAST Observatory LAT GBM NaI Sensors LAT Radiators Solar Array GBM BGO Sensors +Z Spacecraft +X +Y rev. 2 4

5 Instrument Structure Anti Coincidence Detector 16 Tracker Modules Grid 16 Calorimeter Modules Electronics Modules Radiators Mass Power 3000 Kg 650 Watts rev. 2 5

6 LAT Organization Chart EPO L. Cominsky Instrument Science Performance S. Ritz System Engineering D. Horn Chief Engineer L. Klaisner, Acting Mechanical Integration M. Nordby Principal Investigator P. Michelson Instrument Scientist S. Ritz Project Manager L. Klaisner D. Horn, Deputy J. Martin, Deputy Collaboration Science Team Senior Science Advisory Committee N. Gehrels Instrument Advisory Committee S. Kahn Administration Debbie Nicholson Project Controls T. Boysen QA & Mission Assurance D. Marsh Manufacturing J. Clinton TKR R. Johnson ACD D. Thompson DAQ & FSW G. Haller I&T E. Bloom CAL N. Johnson IOC D. Lung, Acting Mechanical M. Campell SAS R. Dubois rev. 2 6

7 Overall Schedule Calendar Years Level 1 Milestones CD-1 Approval CD-0 Approval CD-2 Approval CD-3 Approval Grid Complete Schedule Float CD-4 Approval Launch Prelim. & Sys. Design Final Design Engr g Models Build & Test Flight Units LAT I&T Enviro Test Observatory I&T FABRICATION PHASE COMMISSIONING PHASE OPERATIONS PHASE GLAST planned for launch in February 2007 rev. 2 7

8 LAT Rebaseline for US Funds Budget vs Actuals vs Performance DOE + NASA Project Expenditures 4.1 LAT $M Actual Commitments ACWP RB BCWS+ Planned Commitments RB FUND Fund BCWP BCWS+ Planned Commitments BCWS A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S CY 2000 CY 2001 CY 2002 CY 2003 CY 2004 CY 2005 rev. 2 8

9 Anti-Coincidence Detector - David Thompson, GSFC ACD design is essentially complete Some mechanical interference issues are being resolved Detector/Electronics End-to-End testing Required performance confirmed with flight-type scintillator Tile Detector Assembly (TDA), phototubes (PMT), High Voltage Bias Supply (HVBS), Front End Electronics (FREE) card Fabrication of mechanical structure is underway Composite shell and aluminum base frame are in fabrication FREE Card Signals from TDAs, PMTs HVBS Full-size composite panel for shell rev. 2 9

10 Tracker Robert Johnson, UCSC Tower Structure Italy, SLAC SSD Procurement, Testing Japan, Italy, SLAC SSD Ladder Assembly Italy Tower Assembly and Test (18) Italy 10, Tray Assembly and Test Italy 342 Cable Plant UCSC 18 Electronics Design, Fabrication & Test UCSC, SLAC 648 Composite Panel & Converters Italy, SLAC flight modules + 2 spares rev. 2 10

11 Calorimeter Neil Johnson, NRL CsI Crystals Sweden (KTH) CDE Assembly NRL Mechanical Structure France (IN2P3/Ecole Polytechnique) 72 Front-End Electronics NRL, SLAC Optical Wrap PIN Diode (each end) Twisted Pair Wires CsI Crystal Module Assembly and Test, NRL+collab flight modules + 2 spares 18 PEM Assembly NRL rev. 2 11

12 Data Acquisition Gunther Haller, SLAC Global trigger ACD Signal Unit Empty boxes for heat conduction (5x) Spacecraft Interface Unit (2x) Power Distribution Unit Tower Electronics Module (16x) Tower Power Supply (16x) Event Processing Unit (3x) rev. 2 12

13 Mechanical Marc Campell, SLAC Radiator Grid Cut-outs for solar array launch locks Hole to accommodate solar array mast VCHP reservoirs Radiator Mount Bracket at 4 corners of Grid rev. 2 13

14 1X4 Engineering Model under test rev. 2 14

15 Flight Grid after rough machining rev. 2 15

16 LAT I&T Elliott Bloom, SLAC I&T Facility SLAC Bldg 33 rev. 2 16

17 Engineering Models 1 X 4 Grid Calorimeter EM Tracker Minitower rev. 2 17

18 LAT Engineering Model rev. 2 18

19 Cosmic Ray Tracks in the EM Preliminary data GLAST Online Single Event Display Preliminary Cosmic Ray Data taken on Sept 3!!! CAL Pedestal subtracted Zero suppress off 4 range off rev. 2 19

20 Project Issues 1. Transition to flight hardware production a. Closing design issues b. Qualification testing 2. Aggressive cost and schedule plan a. 9 weeks of schedule float and 25 % cost contingency 3. Communications a. Multi-disciplines b. Work spread around the world 4. End to end performance assessment a. Assuring that the instrument will meet science requirements b. PI has established a task force rev. 2 20

21 Status Project cost and schedule reviewed Strong sponsor support Cost and schedule is still tight LAT Design is mature Instrument configuration is well understood Details need to be closed Transition to manufacture of flight hardware Complete detailed design and analysis Thorough testing Subsystem modules tests System tests Engineering model tests Hardware qualification testing Next 6 months critical to closing issues and beginning fabrication rev. 2 21

22 Summary A new capability is in place at SLAC Managing, fabricating and operating a space instrument Draws on previous experience in particle detectors and space instruments New facility at SLAC for instrument integration and test Specialists in space technology added to the staff Working relationships in place NASA and DOE NRL, GSFC, UCSC and collaborators US, Italy, Sweden, Japan and France This staff and these facilities are an important resource for supporting further Astro-Physics projects GLAST will provide important opportunities for scientific discovery through 2017 rev. 2 22