Title: Prototype BeamTest Tracker Module
1GLAST Large Area Telescope LAT Project
Overview Peter F. Michelson Department of
Physics, HEPL, SLAC Stanford University Principa
l Investigator and Spokesperson peterm_at_leland.sta
nford.edu
2LAT Project Overview
- Outline
- Overview of GLAST Mission
- LAT Team Presentations
- Project History
- LAT Instrument Design Overview
- LAT Collaboration Organization, Agreements,
etc. - Science Overview, Goals and Science
Requirements Document
3Gamma-ray Large Area Space Telescope
- GLAST Mission
- high-energy gamma-ray
- observatory 2 instruments
- - Large Area Telescope
- (LAT)
- - Gamma-ray Burst
- Monitor (GBM)
- launch (Sept 2005)
- Delta 2 class
- mission operations
- science
- - LAT Collaboration
- - GBM team
- - Guest Observers
- lifetime
- 5 years (minimum)
- GLAST Observatory
- spacecraft
- LAT
- GBM
4LAT Review Committee Charge
- Review the technical progress, including the
status of RD, relative to the scientific
requirements for the instrument - Examine the proposed budget, cost, and schedule
profile, including commitment of funds and
personnel, to determine its adequacy to complete
the project on schedule and on budget. Is the
contingency adequate for the project at this
stage of development? - Evaluate the management structures, including the
relationships to the GLAST Mission organization
and relationships with foreign collaborating
institutes, as to their adequacy to deliver the
LAT within the specifications and on time for the
projected launch date.
5LAT Instrument Team Presentations
- Project Overview P. Michelson
- Project Management W. Althouse
- Instrument Design S. Ritz
- Tracker R. Johnson
- Calorimeter N. Johnson
- Anticoincidence Detector J. Ormes
- Electronics, DAQ, G. Haller
- Flight Software
- Mechanical Systems M. Nordby
- Integration Test, Calibration M. Nordby
- Science Analysis Software R. Dubois
- Inst. Ops. Ctr.
6GLAST LAT Project History
- LAT concept and technology in development since
1992, with DOE/NASA support - Initial collaboration members proposed GLAST as
New Mission Concept in Astrophysics to NASA
Office of Space Science, Nov 1994 - Mission endorsed by NASA Space Science Advisory
Committee and highest priority of Structure and
Evolution of the Universe Subcommittee, Nov 1997 - Presented to HEPAP, Jan 1997 submitted proposal
for LAT to DOE, Feb 1998 reviewed by SAGENAP,
April 1998 - Reviewed and endorsed by French Space Agency
(CNES), 1998 - Collaboration LAT Flight Proposal selected by
NASA, Feb 2000 - Foreign endorsement of proposal by CNES, CEA,
IN2P3, ASI, INFN, JGC, SGC - Wallenberg Foundation approves support for
Swedish participation, Mar 2000 - NRC Decadal Astronomy Astrophysics Review ranks
GLAST highest priority moderate-size space
mission for next decade, Sept 2000 - NASA Independent Assessment of Mission,
May-Sept, 2000 - Mission Systems Requirements Review, Sept 27,
2000 - Joint ASI/INFN (Italy) committee agree on joint
funding, Dec 2000 INFN Group II reviews/endorses
funding for INFN participation, Jan 2001
7Large Area Telescope (LAT) Design Overview
Instrument
16 towers ? modularity height/width 0.4 ?
large field-of-view Si-strip detectors total
of 106 ch. hodoscopic CsI crystal array
? cosmic-ray rejection ? shower
leakage correction shower max
contained lt 100 GeV segmented plastic
scintillator ? minimize self-veto
Tracker
Calorimeter
Anticoincidence Detector Shield
3000 kg, 650 W (allocation) 1.75 m ? 1.75 m ?
1.0 m 20 MeV 300 GeV
Flight Hardware Spares 16 Tracker Flight
Modules 2 spares 16 Calorimeter Modules 2
spares 1 Flight Anticoincidence Detector Data
Acquisition Electronics Flight Software
8International Collaboration
- expertise in each science topic (theory obs.)
- experience in high-energy and space
instrumentation - access to X-ray, MeV, and TeV observatories by
collaboration - for multi-wavelength observations
- mirror data site in Europe
100 collaborators from 28 institutions
CAL
9GLAST LAT Organization
Collaboration Science Team
E/PO L. Cominsky, SSU
Principal Investigator P. Michelson, SU
SSAC N. Gehrels, GSFC
Instrument Scientist S. Ritz, GSFC
Project Manager W. Althouse, SU-SLAC
Instrument Design Team T. Kamae, SLAC
System Engineer T. Thurston, SU-SLAC
Project Controls T. Boysen, SU-SLAC
Integration Test M. Nordby, SU-SLAC
Electronics DAQ G. Haller, SU-SLAC
Performance Safety Assurance D. Marsh, SU-SLAC
Mech. Systems M. Nordby, SU-SLAC
10Collaboration Organization
- Senior Scientist Advisory Committee
- Membership
- N. Gehrels, Chair
- P. Michelson, PI/Spokesperson
- G. Barbiellini, Italy
- R. Bellazzini, Italy
- E. Bloom, U.S.
- T. Burnett, U.S.
- P. Carlson, Sweden
- A. Djannati-Atai, France
- R. Dubois, U.S.
- I. Grenier, France
- N. Johnson, U.S.
- R. Johnson, U.S.
- T. Kamae, Japan
- J. Ormes, U.S.
- S. Ritz, U.S.
- H. Sadrozinski, U.S.
- D. Thompson, U.S.
- K. Wood, U.S.
- SSAC Charter
- Advise PI/Spokesperson on the conduct of the
LAT Science - Investigation
- Implement collaboration membership policy and
publication policy - Advise PI and LAT Management on LAT design
issues that critically - impact science performance
- Meets quarterly
11Collaboration Organization
- Instrument Design Team
- Chair T. Kamae, Instrument Technical Manager
- Deputy Chairs R. Bellazzini (Italy), E. Bloom
(US), J. Paul (France) - Membership includes all subsystem managers key
system engineering personnel - Reports to Project Manager, W. Althouse
- IDT Charter
- Facilitate exchange of information between
subsystems to - maintain coordinated design resolve issues or
refer to IPO - for resolution
- Meetings open to the Collaboration
- Weekly video conference meetings
12Summary of MoAs
- MoAs between Stanford University-SLAC and
collaborating institution(s) regarding
participation in LAT Project - Ratify flight proposal and define technical role
- Establish management policies and areas of
responsibility - Establish responsibilities and membership of
committees of the collaboration - Senior Scientist Advisory Committee (SSAC)
- Instrument Design Team (IDT)
- Define International Finance Committee
- Meet periodically to review status of funding
commitments of all partners - Membership representative of all funding agencies
involved in the LAT - Identify Key Personnel
- Includes Statement of Work, general conditions
concerning cross-waiver of liability, data
intellectual property, international exchange of
information materials - Signatories
- Stanford University SLAC Director PI
- collaborating institutions responsible
institutional management authorities, lead
scientist(s), subsystem manager
13Agreements concerning LAT Project
- MoAs between SU-SLAC and collaborating
institution(s) - GSFC/LHEA 3/15/01
- NRL 3/15/01
- CEA/DAPNIA IN2P3, France NRL 4/15/01
- Royal Inst. Of Technology Stockholm Univ.,
Sweden NRL 3/01/01 - UCSC/SCIPP 4/01/00
- INFN, Italy UCSC/SCIPP 5/01/01
- Hiroshima Univ., ISAS RIKEN, Japan
UCSC/SCIPP 3/01/01
14Agreements concerning LAT Project
- DOE NASA Implementing Arrangement
- establish US agency roles responsibilities for
LAT Project define Joint Oversight Group (JOG) - DOE Stanford University MO Contract for SLAC
- work at SLAC on LAT authorized by
Project Number KA050102-EQU01CC - NASA Stanford University Contract NAS 5-00147
- authorizes NASA funding for work at SU
on LAT Project - SU Sonoma State University Subcontract for
E/PO - NASA NRL Defense Purchase Request
- NASA CNES (French Space Agency) International
Agreement - establishes overall participation of
France in GLAST - NASA ASI (Italian Space Agency) International
Agreement - establishes ASI provision of Malindi
Ground Station acknowledges ASI - contribution to LAT (managed by INFN)
15Scientific Heritage CGRO-EGRET
163rd EGRET Source Catalog
- 271 sources
- 172 sources are unidentified
17GLAST Science Topics
- Active Galactic Nuclei
- Isotropic Diffuse Background Radiation
- Cosmic Ray Production
- Identify sites and mechanisms
- Endpoints of Stellar Evolution
- Neutron Stars/Pulsars
- Black Holes
- Unidentified Gamma-ray Sources
- Dark Matter
- Solar Physics
- Gamma-Ray Bursts
- DISCOVERY!
18LAT Source Catalogs
2 days of the survey 344 sources GRB, AGN, 3EG
Gal. plane halo sources
gt 1 GeV
M31 gt 1 GeV
19LAT Science capabilities - resolution
Source localization (68 radius) ? bursts
1 to tens of arcmin Unidentified EGRET
sources 0.3 to 1 Extended sources spatially
spectrally resolved Supernova Remnants ?
cosmic-ray plerion acceleration Interstellar
emission up to TeV, ?E/E ? ?0 decay emission
?
cosmic-ray propagation pc ? kpc Nearby
galaxies Galaxy clusters ?
cosmic-ray production halos
gt 1 GeV
M31 gt 1 GeV
20Science capabilities - sensitivity
large field-of-view
200 ? bursts per year ? prompt emission
sampled to gt 20 µs AGN flares gt 2 mn ? time
profile ?E/E ? physics of jets and
acceleration ? bursts delayed emission all
3EG sources 80 new in 2 days ? periodicity
searches (pulsars X-ray binaries) ? pulsar
beam emission vs. luminosity, age, B 104
sources in 1-yr survey ? AGN logN-logS, duty
cycle, emission vs. type, redshift,
aspect angle ? extragalactic background light
(? IR-opt) ? new ? sources (µQSO, ext.
galaxies, clusters)
21GLAST Mission Science Requirements Document
- Heritage of SRD
- GLAST Mission Facility Science Definition Team
- broadly representative of international
astro-particle physics community - Developed first GLAST Mission SRD before NASA
flight AO issued February 1999 - GLAST Mission Science Working Group
- Representation from LAT Collaboration, GBM team,
community (Interdisciplinary Scientists) - Advisory to GLAST Mission
- Updated SRD September 2000, consistent with LAT
Flight Proposal, GBM Flight Proposal, Level-1
Mission Requirements Document - Level-1 Requirements Document NASA Hdqtrs / DOE
22Simplified Requirements Flow
Mission Science Requirements Document (SRD)
Mission System Specification (MSS)
Mission Assurance Requirements (MAR)
Interface Requirements Document (IRD)
LAT System Specifications
Design Trade Study Space
LAT Subsystem Requirements
23LAT Performance
Optimized Point Spread Function (0.35o _at_ 1 GeV)
Wide Field of View (2.4 sr)
More than 40 times the sensitivity of EGRET
Includes Bkgrd. Rejection
Good Energy Resolution (DE/E 10)
Large Effective Area (20 MeV 1 TeV)
24Summary
- LAT Instrument based on proven technologies
instrument design and technology under
development since 1992 completing design for
PDR/Baseline Review - LAT Instrument Project Office at SU-SLAC now
staffed - Obtaining LAT goals made possible by sponsorship
of DOE, NASA and foreign partners (France, Italy,
Japan, Sweden) - GLAST Large Area Telescope (LAT) Collaboration
now well defined but confirmed agreements not
yet signed with key partners introduces schedule
risk - Working aggressively to finalize MoAs (and
International Agreements) - Working to facilitate DOE NASA Implementing
Arrangement