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GLAST Large Area Telescope - Operations DOE Review, 15 June 2005
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GLAST Large Area TelescopeGLAST Large Area Telescope
Operations Review
Rob CameronInstrument Science Operations Center ManagerStanford Linear Accelerator [email protected]
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST Large Area Telescope - Operations DOE Review, 15 June 2005
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OutlineOutline
LAT Integration and Test– Schedule– Activities
GLAST Operations at SLAC– GLAST Ground System– LAT Instrument Science Operations Center– Online operations– Offline operations
Looking ahead
GLAST Large Area Telescope - Operations DOE Review, 15 June 2005
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Master ScheduleMaster Schedule
LAT complete and testedJanuary 9, 2006
– To NRL for environmental testing
Delivery to Observatory IntegrationJune
1, 2006
– Mate with spacecraft and GBM and test
Launch August 31, 2007
– Kennedy Space Flight Center
Spitzer Telescope Launch on a Delta II
Heavy
GLAST Large Area Telescope - Operations DOE Review, 15 June 2005
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Integration and Test - OrganizationIntegration and Test - Organization
Integration Facilities Configuration and Test (IFCT)
Mechanical Ground Support Equipment
(MGSE)
Particle Test
Integration, Test, and
Calibration
Electrical Ground Support Equipment (EGSE) / Online
SoftwareScience Verification
Analysis and Calibration (SVAC)
Management
Lead:Elliott Bloom
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LAT Integration and Test ScheduleLAT Integration and Test Schedule
TKR A 2/4/05A
TKR 14 9/9/05
ACD 7/15/05
CAL A 12/08/04A
CAL 5/25/05
DAQ 9/23/05
FSW Complete
TEM/PS A 2/17/05A
TEM/PS 6/29/05
X-LAT 6/1/05
08/30/05
GRID Assembly 2/25/05A
Install Twrs A&B
8 wks
2 Tower CPT
3 wks
Install Twrs 1-13
13 wks
Install Tower 14
1 wk 09/22/05
Install Global Items
10/24/05
01/14/06 05/07/06
SystemTest
9 wks
Ship LAT1 wk
Enviro Test
12 wks
LAT RFI
Observ. Integration
Launch 2007
FSW Formal
Test
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LAT Integration and Test at SLACLAT Integration and Test at SLAC
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LAT Anti-Coincidence DetectorLAT Anti-Coincidence Detector
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Overview of LAT Data Taking ConfigurationsOverview of LAT Data Taking Configurations
Cosmic rays and a low energy photon beam are used to characterize the instrument performance at different phases of LAT integration
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
6 Towers4 Towers 8 Towers
10 Towers 12 Towers 14 Towers 16 Towers LAT
1 Tower(Single bay, special
grid)
12 13 14 15
8 9 10 11
4 5 6 7
0 1 2 3
2 Towers
By the end of the LAT integration there will be a couple TBytes of data to be analyzed. A LAT wide collaboration effort driven by SLAC is being organized to understand these data
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Cosmic Rays: Data and MC SimulationsCosmic Rays: Data and MC SimulationsFrom Leon Rochester/Tracy Usher/Bill Atwood/Johann Cohen-Tanugi
Good agreement between true and reconstructed distributions
for 100 MeV muons in MC Simulations
From Zach Fewtrell and Dave Smith
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First Light ! - Photon candidateFirst Light ! - Photon candidateFrom Anders Borgland based on Bill Atwood selection
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GLAST MISSION ELEMENTSGLAST MISSION ELEMENTS
GN
HEASARCGSFC
-
-
DELTA7920H •
White Sands
TDRSS SNS & Ku
LAT Instrument Science Operations Center
GBM Instrument Operations Center
GRB Coordinates Network
• Telemetry 1 kbps•
-•
S
Alerts
Data, Command Loads
Schedules
ArchiveMission Operations Center (MOC)
GLAST Science Support Center
• sec•
•
•
GLAST Spacecraft
Large Area Telescope& GBMGPS
GLAST MISSION OPERATIONS ELEMENTS
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LAT ISOC ObjectivesLAT ISOC Objectives
The LAT ISOC is organized to:– Safely operate the instrument– Reconstruct LAT events and produce selected science data
Main Functions:– Command planning and construction– Instrument health and safety monitoring– Maintain and modify FSW and the LAT Testbed– LAT performance verification and optimization– Process, archive and deliver LAT data– Maintain and optimize the software that produces science
data products
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The ISOC in the LAT CollaborationThe ISOC in the LAT Collaboration
ISOC has close connections to LAT Science Groups
– e.g. Working with Calibration and Analysis Methods Group to incorporate improvements to event reconstruction into ISOC processing and products
ISOC has broad involvement in the LAT collaboration
– e.g. instrument performance analysis and tool development are coordinated by the ISOC across the collaboration
See Elliott Bloom’s talk
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Online OperationsOnline Operations
Mission Support– Build command loads– Monitoring and
trending– Anomaly resolution
Data Management– Interfaces– Database Ingest– Product delivery
Configuration control– Config tracking– Config updates
Flight software– Maintenance– Updates
Data resources are shared between Online and Offline
– Databases
– Interface tools
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LAT Data Flow LabLAT Data Flow Lab
Online operations will be supported by the LAT Data Flow Lab
– Command load verification
– Instrument configuration validation
– Flight software development and test platform
DAQ Testbed Simulator
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Offline OperationsOffline Operations
Lead: Richard Dubois Key activities
– Science data processing– Event reconstruction– Quick look science analysis– Serving data to the LAT
collaboration Uses SLAC SCS computer farm
– 75 CPUs – 40TB disk space per year
Flexible implementation– Pipelined data processing
Data Pipeline
Sim
Raw Data
Level 0
Recon
Level 1 Science Tools
Level 2
Recon: interpret LAT readout and estimate directions and energies; flag background
Sim: full modeling of e//p interactions and readout in
the LAT
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Instrument Simulation and ReconstructionInstrument Simulation and Reconstruction
SourceFluxes
Geometry
ParticleTransport
“Raw”Data
Recon
BackgroundRejection
-Particle ID
SourceFluxes
Geometry
ParticleTransport
“Raw”Data
Recon
BackgroundRejection
-Particle ID
CALORIMETER Detail
Instrumentdata
3 GeV gamma interaction
3 GeV gamma recon
Event reconstruction validated by beam testsRef 1:Ref 2:
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Event Display and Inspection: FREDEvent Display and Inspection: FRED
Multiple views
3D controls
Graphics tree
Graphics metadata:HepRep
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Science Verification Analysis and CalibrationScience Verification Analysis and Calibration
Coordinated by Eduardo do Couto e Silva– The Science Verification Process prior to instrument delivery– A LAT collaboration effort, coordinated through a series of instrument
analysis workshops– familiarizes LAT collaborators with the LAT instrument and LAT data
taking and analysis– Prepares transition from pre-launch to on-orbit operations and data
analysis Activities
– Process, archive and verify the integrity of data– in conjunction with offline processing
– Produce reports to assess data quality and verify instrument configuration
– Generate calibrated data analysis files and update, improve and track changes in the calibration constants
– to be used in event reconstruction – Characterize the low level performance of the LAT at several stages of
instrument integration – using cosmic rays and low energy photons
– Refine MC simulations – using cosmic rays and low energy photons
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SVAC: Detector CalibrationsSVAC: Detector Calibrations
TOT before calibration
TOT after calibration
From Hiro Tajima
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Quick-look Science AnalysisQuick-look Science Analysis
3EG catalog (Hartman et al. 1999)
Monitored sources– Release a preliminary source list
that includes sources detected with very high confidence (e.g. >20σ)
– Selected sources to be monitored regularly in phase 1. Source list (~20 sources) defined before launch, with community input
– Quick look data include source position, average source flux, the peak source flux and estimated spectral index
Bursts and transient sources– Refine positions, fluxes, spectra
for detected transients– Alerts can be generated for bursts
and transient sources detected in Level 2 processing
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Science ToolsScience Tools
User Interface aspects of the standard analysis environment, such as Image/plot display (UI2), Command line interface & scripting (UI4), and GUI & Web access (UI5) are not shown explicitly.
1 This tool also performs periodicity tests and the results can be used to refine ephemerides2 These tools can also take as input binned data from other instruments, e.g., GBM; the corresponding DRMs must also be available.
Pulsarephem. (D4)
Level 1 (D1)
LAT Point sourcecatalog (D5)
Interstellar em.model (U5)
Pointing/livetimehistory (D2) Astron.
catalogs (D6)
Level 0.5
IRFs (D3)
Alternative source for testing high-level analysis
Alternative for making additional cuts on already-retrieved event data
Pt.ing/livetimesimulator (O1)
Observationsimulator (O2)
Pt.ing/livetimeextractor (U3)
Data sub-selection (U2)
Data extract(U1)
Exposurecalc. (U4)
Likelihood (A1)
Map gen(U6)
Src. ID (A2)
Eventdisplay (UI1)
Pulsarprofiles (A3)1
CatalogAccess (U9)
Pt.ing/livetimeextractor (U3)
Pulsar phaseassign (U12)
Pulsar periodsearch (A4)
GRB spectral-temporalmodeling (A10)
Source modeldef. tool (U7)
Arrival timecorrection (U10)
GRB temporalanalysis (A7)2
GRB LAT DRMgen. (U14)
GRB spectralanalysis (A8)2
GRB eventbinning (A5)
GRB unbinnedspectral analysis (A9)
GRB visual-ization (U13)
IRF visual-ization (U8)
Ephemerisextract (U11)
GRB rebinning(A6)2
Standard Analysis EnvironmentCoordinated by Seth Digel
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Onward to Launch!Onward to Launch!
Instrument Integration and Test is proceeding well– Six flight towers integrated into the Grid– Seven Tracker modules at SLAC– Ten Calorimeters are at SLAC
• All 16 plus 2 spares are complete– Anti-Coincidence Detector complete and ready for environmental
test Ground system implementation is in progress
– ISOC participating in GLAST ground system tests• 6 Ground readiness tests, 2005-2006• 6 End-to-End tests, 2006-2007
– Preparing support for late stage LAT testing• LAT environmental tests, 2006• Observatory integration, 2006-2007
– Offline operations validated by Data Challenges• DC2 scheduled for January 2006
– Fourth instrument analysis workshop in July 2005