GLAST LAT Project
Gamma-ray Large Area
Space Telescope
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
GLAST Large Area Telescope:
LAT Project Overview
Peter F. Michelson
Department of Physics, HEPL, & SLAC
Stanford University
Principal Investigator and Spokesperson
peterm@leland.stanford.edu
Peter Michelson
1
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT Project Overview
Outline
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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
Peter Michelson
2
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Gamma-ray Large Area Space Telescope
GLAST Mission
GLAST Observatory
• spacecraft
• LAT
• GBM
 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)
Peter Michelson
LAT Inst. Ops. Center
Routine Data
Alerts
Large loads
TOO commands
LAT Data
Spacecraft,
GBM data
Status
Command Loads
Mission Ops Center
Observatory safety
Spacecraft health
Commanding
Mission scheduling
GBM data handling
LAT data handling
Instrument performance
Level 0,1 data processing
Science Support Center
Schedules
Spacecraft data for
archiving
Science scheduling
Archiving
Guest Observer Support
Standard product processing
Burst and transient Alerts
GRB
Coordinates
Network
Status
Command Loads
GBM Inst. Ops. Center
Instrument performance
Standard product processing
3
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT Review Committee Charge
• Review the technical progress, including the status of R&D,
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.
Peter Michelson
4
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT Instrument Team Presentations
WBS#
Description
Project Overview
P. Michelson
Project Management
W. Althouse
Instrument Design
S. Ritz
Tracker
R. Johnson
Calorimeter
N. Johnson
4.1.1
Instrument Management
4.1.2
Systems Engineering
4.1.3
(Reserved)
4.1.4
Tracker
4.1.5
Calorimeter
4.1.6
Anti-Coincidence Detector
4.1.7
Electronics and Data
Acquisition
Anticoincidence Detector
J. Ormes
4.1.8
Mechanical Systems
G. Haller
4.1.9
Instrument Integration and
Test
Electronics, DAQ,
& Flight Software
4.1.A
Performance & Safety
Assurance
Mechanical Systems
M. Nordby
Integration & Test, Calibration
M. Nordby
Science Analysis Software
& Inst. Ops. Ctr.
R. Dubois
4.1.B
Instrument Operations
Center
4.1.C
Education & Public Outreach
4.1.D
Science Analysis Software
4.1.E
Suborbital Flight Test
Peter Michelson
5
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
GLAST 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
Peter Michelson
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GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Large Area Telescope (LAT) Design Overview

Instrument
16 towers  modularity
height/width = 0.4  large field-of-view
Tracker
Si-strip detectors: total of ~106 ch.
Calorimeter
hodoscopic CsI crystal array
 cosmic-ray rejection
 shower leakage correction
shower max contained < 100 GeV
Anticoincidence Detector Shield
segmented plastic scintillator
 minimize self-veto
e+
Flight Hardware & Spares
16 Tracker Flight Modules + 2 spares
16 Calorimeter Modules + 2 spares
1 Flight Anticoincidence Detector
Data Acquisition Electronics + Flight Software
Peter Michelson
e–
3000 kg, 650 W
(allocation)
1.75 m  1.75 m  1.0 m
20 MeV – 300 GeV
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GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
International 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
Organizations with LAT Hardware Involvement
TKR
CAL
ACD
CAL
TKR
Stanford University & Stanford Linear Accelerator Center
NASA Goddard Space Flight Center
Naval Research Laboratory
University of California at Santa Cruz
University of Washington
Commissariat a l’Energie Atomique, Departement d’Astrophysique (CEA)
Institut National de Physique Nuclearie et de Physique des Particules (IN2P3):
Ecole Polytechnique, College de France, CENBG (Bordeaux)
Hiroshima University
Institute of Space and Astronautical Science, Tokyo
RIKEN
Tokyo Institute of Technology
Instituto Nazionale di Fisica Nucleare (INFN): Pisa, Trieste, Bari, Udine, Perugia, Roma
TKR
CAL Institute of Technology (KTH), Stockholm
Royal
Peter Michelson
CAL
8
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
GLAST LAT Organization
Collaboration
Science Team
E/PO
L. Cominsky, SSU
Principal Investigator
P. Michelson, SU
Instrument Scientist
SSAC
N. Gehrels, GSFC
S. Ritz, GSFC
Project Manager
Instrument Design Team
W. Althouse, SU-SLAC
T.T.
Kamae,
Kamae,
SU-SLAC
SLAC
System Engineer
Project Controls
T. Thurston, SU-SLAC
T. Boysen, SU-SLAC
Electronics & DAQ
Integration & Test
G. Haller, SU-SLAC
M. Nordby, SU-SLAC
Performance & Safety
Assurance
Mech. Systems
M. Nordby, SU-SLAC
TKR
CAL
R. Johnson, UCSC
SLAC, Italy, Japan
N. Johnson, NRL
France, Sweden
Peter Michelson
D. Marsh, SU-SLAC
ACD
IOC
J. Ormes, GSFC
S. Williams, SU-HEPL
Sci. Software
Balloon Flight
R. Dubois, SU-SLAC
Team
D. Thompson, GSFC
Team
9
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Collaboration 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
Peter Michelson
10
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Collaboration 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
Peter Michelson
11
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Summary 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
Peter Michelson
12
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Agreements 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
Peter Michelson
13
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Agreements concerning LAT Project
• DOE – NASA: Implementing Arrangement
– establish US agency roles & responsibilities for LAT Project; define Joint
Oversight Group (JOG)
• DOE – Stanford University: M&O 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)
Peter Michelson
14
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Scientific Heritage: CGRO-EGRET
EGRET All-Sky Map (E> 100MeV)
3C279
Cygnus
Region
Vela
Geminga
Crab
PKS 0528+134
Cosmic Ray
Interactions
With ISM
Peter Michelson
LMC
PSR B1706-44
PKS 0208-512
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GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
3rd EGRET Source Catalog
•
•
271 sources
172 sources are unidentified
Peter Michelson
16
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
GLAST 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!
Peter Michelson
17
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT Source Catalogs
Catalog strategy
precise interstellar emission model
new statistical analyses including
variability and spectral signatures
2
days
of the survey:
sources
LAT
Catalog:
~10,000344
sources
(1 yr)
GRB, AGN, 3EG + Gal. plane & halo sources
> 1 GeV
Transients or Flares
rapid alert for GRBs (15 s to the ground)
 distinguish unresolved gas
clumps
 flux histories
cross references with astronomical
catalogs M31 > 1 GeV
sky survey data analyzed on a daily basis
timely IAU circulars and WWW
announcements
 GRB catalog
Peter Michelson
18
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT 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
> 1 GeV
Peter Michelson
M31 > 1 GeV
19
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Science capabilities - sensitivity
large field-of-view
100 s
200  bursts per year
 prompt emission sampled to > 20 µs
AGN flares > 2 mn
1 orbit
 time profile + E/E 
acceleration
physics of jets and
 bursts delayed emission
all 3EG sources + 80 new in 2 days
1 day
 periodicity searches (pulsars & X-ray binaries)
3EG 
limit
0.01 
1 yr catalog
0.001
LAT 1 yr
2.3 10-9
cm-2 s-1
Peter Michelson
 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)
20
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
GLAST 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
Peter Michelson
21
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Simplified Requirements Flow
Mission Science Requirements Document (SRD)
Mission System
Specification (MSS)
Interface
Requirements
Document (IRD)
Mission Assurance
Requirements (MAR)
LAT System
Specifications
Design Trade
Study Space
LAT Subsystem
Requirements
Peter Michelson
22
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
LAT Performance
Optimized Point Spread Function
(0.35o @ 1 GeV)
Wide Field of View
(2.4 sr)
More than 40 times
the sensitivity of
EGRET
FOV w/ energy
measurement
due to
favorable
aspect ratio
Includes Bkgrd.
Rejection
Effects of
longitudinal
shower
profiling
Large Effective Area
(20 MeV – 1 TeV)
Peter Michelson
Good Energy Resolution
(E/E ~ 10%)
23
GLAST LAT Project
DOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001
Summary
•
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
Peter Michelson
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