Transcript 1. Introduction Science Overview

GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
CDR/CD-3 Review May 12-16, 2003
GLAST Large Area Telescope:
Introduction & Science Overview
Peter F. Michelson
Stanford University
LAT Principal Investigator &
Spokesperson
[email protected]
(650) 723-3004
Document: LAT-PR-01967
Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Introduction and Science Overview
Outline
 GLAST Mission and Science Overview
 Large Area Telescope
 instrument overview
 transition from design to flight hardware fabrication
 status: schedule, cost, international commitments
 challenges
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Through most of history, the cosmos has
been viewed as eternally tranquil
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
`
During the 20th century the quest to broaden our view of
the universe has shown us the vastness of the Universe
and revealed violent cosmic phenomena and mysteries
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
GLAST is an important part of the continuing quest
to broaden our view of the universe.
 observe, with unprecedented detail, cosmic
arenas of extreme violence
 explore Nature’s highest energy processes
(10 keV – 300 GeV)
- LAT: ~20 MeV - >300 GeV
- GBM: correlative transient
observations ~10 keV – 20 MeV
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
EGRET all-sky survey
(70 MeV – 10 GeV)
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
3rd EGRET Catalog
AGN - blazars
pulsars
unidentified
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LMC
Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
rd EGRET Catalog
3
Survey: ~10,000 sources
GLAST
(2days)
years)
GLAST Survey: ~300 sources (2
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
GLAST Observatory
Gamma Ray Burst Monitor (GBM)
Spacecraft
Launch Vehicle
Launch Location
Orbit Altitude
Orbit Inclination
Orbit Period
Orientation
Launch Date
Document: LAT-PR-01967
Large Area Telescope (LAT)
Person
Delta II – 2920-10H
Kennedy Space Center
575 Km
28.5 degrees
95 Minutes
+X to the Sun
September 2006
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GLAST LAT Project
Si Tracker
CDR/CD-3 Review May 12-16, 2003
GLAST Observatory
pitch = 228 mm
8.8 105 channels
Gamma
Ray Burst
Monitor
(GBM)
18 planes
(16 with
converters)
Spacecraft
g
ACD
segmented
scintillator
tiles
Large Area Telescope
(LAT)
Person
Grid
Launch Vehicle
Delta II – 2920-10H
mechanical
+
e
e
CsI Calorimeter
Launch Location
Kennedy Space Center
backbone
hodoscopic
array
(8 layers)
Orbit
Altitude
575 Km
3
6.1 10 channels
Orbit Inclination
28.5 degrees
Orbit Period
95 Minutes
LAT: 4 x 4 modular array
Orientation
+X to the3000
Sunkg, 650 W
Data Acquisition
20 MeV
Launch Date
September
2006– 300 GeV
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
GLAST
g
Single Photon Angular
Resolution
3.5o @ 100 MeV
0.15o @ 10 GeV
Wide Energy Range: 20 MeV - >300 GeV
GLAST measures the direction, energy &
Field of View
arrival time of celestial gamma rays Wide
(> 2 sr)
40 times
EGRET’s
- LAT
measures gamma-rays in the energy range
sensitivity
~20and
MeV - >300 GeV
extends
- GBM provides correlative observations of
energy
transient events in the energy range ~20 keV – 20
MeVrange to
300 GeV
Point Source
Sensitivity:
< 6 x 10-9 ph cm-2s-1
e+
e-
Low dead time:
< 100 ms/event
Large Effective Area
(Aeff)peak > 8,000 cm2
(est. performance:
< 3 x 10-9 ph cm-2s-1)
Source
Localization:
0.3’ – 1’
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Good Energy Resolution
DE/E ~ 10%; 100 MeV – 10 GeV
~ < 20%; 10 GeV – 300 GeV
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Transition from design to flight hardware fabrication
•
Engineering Models constructed for each hardware subsystem – under
test and evaluation
•
have carried out subsystem Peer Design Reviews of each subsystem;
Jan - March 2003
•
Production readiness reviews
•
long-lead parts ordered and long-lead fabrication initiated
•
finalizing flight instrument design details: comprehensive review at LAT
Critical Design Review (CDR) – CD-3; May 12-16, 2003
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Schedule highlights
Calendar Years
2000
2001
2002
PDR
Balloon
Flight
2003
Critical
Design
Review
2004
TKR & CAL
FM A/B
2005
2006
2011
Schedule
Float
Scheduled
Scheduled
Completion
LAT Delivery
Begin
LAT I&T
Launch
Ops.
Prelim. & Sys. Design
Final Design
Engr’g Models
Build & Test
Flight Units
FABRICATION PHASE
LAT I&T
Observatory
I&T
COMMISSIONING
PHASE
GLAST scheduled for launch in September 2006
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Summary Schedule
COMMISSIONING
PHASE
FABRICATION PHASE
15
• recently
moved beam test to after completion
Electronics
Fab & Test
of instrument
I&T
Tracker
Fab & Test LAT completion date
• preserves
Calorimeter
Fab & Test
12
• adds schedule float between subsystem
ACD Fab & Test
deliveries and I&T need dates
LAT Complete 5/25/05
GRID Fab & Test
14 wks Schedule Float
9
{
Begin assembly 6/15/04
6
Ship Instrument
Observatory I&T
Launch
3
LAT Operations & Data Analysis
}
Instrument I&T
Beam Test
3 wks
Schedule Float
9/22/05
9/06
0
FY02
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FY03
FY04
FY05
FY06
Section 1 Introduction & Science Overview
FY07
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Budgeted Fabrication Cost
Budgeted DOE + NASA Costs for Fabrication Phase
(escalated $M)
Budgeted Cost at Completion
Contingency
Total Estimated Cost (TPC=TEC)
Budgeted costs at risk
Contingency fraction
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Baseline
3/31/03
100.0
21.2
121.2
107.5
14.2
121.7
Baseline
3/31/03
72.7
29%
59.4
24%
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
LAT Hardware: International Contributions
g
Si Tracker
ACD
Grid (& Thermal
Radiators)
CsI Calorimeter
e+
e–
Electronics, Data Acquisition
& Flight Software
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Status of International Contributions
• Since baseline, international partners have delivered on commitments
–
–
–
–
Italy: (ASI/INFN) tracker
Japan: tracker (Si-strip detectors)
Sweden: calorimeter (CsI xtals)
France: calorimeter (CDEs, mechanical structure)
• On Thursday, April 24, CNES (the French Space Agency) announced
their withdrawal from planned commitments to the French
contributions to GLAST
– impacting critical procurements by our partners at CEA and IN2P3
– we are working with CEA, IN2P3, and NASA and DOE, to understand the
available options for maximizing the continued French contributions
– in the short term (next few weeks), our French partners at CEA and IN2P3
will continue working; we are beginning implementation of backup plans
for production in the U.S. of calorimeter flight components (.e.g. CDEs).
– by the end of May, a revised plan will be presented to the collaboration
sponsors
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
status summary and highlights of next year
• International Finance Committee formed to regularly review
funding agency commitments – 1st meeting, February 18-19, 2003
• the transition from design to flight fabrication is currently
underway
• first flight hardware deliveries to SLAC scheduled for FebruaryMarch, 2004
– first 4 calorimeter and tracker flight modules will arrive at SLAC
– LAT Grid delivered June 2004 – LAT integration begins
• collaboration meeting planned for Sept 15-19, 2003 in Rome, Italy
– meeting will concentrate on collaboration plan for operations phase:
instrument operations, science data analysis, etc.
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
Challenges
• loss of CNES support for French contributions
– schedule impacts being mitigated now by application of
contingency;
– by end of May, will have revised CAL manufacture plan for
presentation to DOE/NASA JOG, including CEA and IN2P3
contributions that can be confirmed
• very demanding schedule
– subsystem development delays compensated by rescheduling
beam test
• identification and closure of remaining design issues
– issues identified (e.g. peer reviews, etc.); plans exist to close open
issues
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Section 1 Introduction & Science Overview
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GLAST LAT Project
CDR/CD-3 Review May 12-16, 2003
GLAST:
`
Exploring
Nature’s
Highest Energy
Processes
September 2006
launch
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Section 1 Introduction & Science Overview
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