glast large area telescope - operationsdoe review, 15 june 2005 1 glast large area telescope...

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


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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


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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


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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

glast large area telescope - operationsdoe review, 15 june 2005 1 glast large area telescope...

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