GLAST Large Area Telescope Gamma-ray Large Area … Large Area Telescope ... SSD Ladder Assembly...

GLAST LAT Project Experimental Program Advisory Committee, November 14, 2003

rev. 2 1

GLAST Large Area TelescopeGLAST Large Area Telescope

Lowell A. KlaisnerStanford Linear Accelerator CenterLAT Instrument Project Manager

[email protected]

GammaGamma--ray Large ray Large Area Space Area Space TelescopeTelescope


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Status Status –– Transition from Design to Flight HardwareTransition from Design to Flight Hardware

• Design is mature – Instrument Architecture frozen– Some open engineering and manufacturing issues

• Costs reviewed – US budget for the Fabrication Phase is $133 M– DOE/NASA Joint Oversight Group approval– International Finance Committee

• Infrastructure is in place– Staff with experience in space instrumentation and

experience in HEP detectors– New integration and test facility at SLAC– Working relationships between the NASA Mission Office,

the LAT Project Office, Collaborators and foreign partners in place


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•Objective: Larger field of view (FOV), higher sensitivity, and broader energy detection range than any previously flown gamma-ray mission.

•Mission Duration: 5 yrs (10 yr Goal)•Orbit: 565 km Circular, 28.5° Inclination•Launch Date: February 2007•Launch Vehicle: Delta 2920H-10•Launch Site: Kennedy Space Center

GLAST MISSION SUMMARYGLAST MISSION SUMMARY


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LAT

GBM NaI Sensors

GBM BGO Sensors

+Z

+X +Y

LAT Radiators

GLAST Observatory

Solar Array

Spacecraft


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Instrument StructureInstrument Structure

Anti Coincidence Detector

16 Tracker Modules

Grid

16 Calorimeter Modules

Electronics Modules

Radiators

Mass 3000 KgPower 650 Watts


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LAT Organization ChartLAT Organization Chart

Principal InvestigatorP. Michelson

Instrument ScientistS. Ritz

Senior Science Advisory CommitteeN. Gehrels

Collaboration Science Team

Project ManagerL. Klaisner

D. Horn, DeputyJ. Martin, Deputy

Instrument Advisory CommitteeS. Kahn

Instrument Science PerformanceS. Ritz

AdministrationDebbie NicholsonProject Controls

T. BoysenQA & Mission Assurance

D. MarshManufacturing

J. Clinton

Chief EngineerL. Klaisner, Acting

System EngineeringD. Horn

TKRR. Johnson

Mechanical IntegrationM. Nordby

ACDD. Thompson

DAQ & FSWG. Haller

I&TE. Bloom

SASR. Dubois

MechanicalM. Campell

IOCD. Lung, Acting

CALN. Johnson

EPOL. Cominsky


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2001 2002 2003 2004 2005 2006 2007 2011

Calendar Years

GLAST planned for launch in February 2007

CD-4 ApprovalCD-3 Approval

CD-2 Approval

CD-1 ApprovalCD-0 Approval

Grid Complete

Level 1Milestones

FABRICATION PHASE COMMISSIONINGPHASE

Build & TestFlight Units

ObservatoryI&T

Final DesignEngr’g Models

LAT I&TPrelim. & Sys. Design

EnviroTest

OPERATIONSPHASE

ScheduleFloat

Overall ScheduleOverall Schedule

Launch


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LAT Rebaseline for US FundsLAT Rebaseline for US FundsBudget vs Actuals vs PerformanceDOE + NASA Project Expenditures

4.1 LAT

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S

CY 2000 CY 2001 CY 2004 CY 2005

$M

Actual Commitments

ACWP

RB BCWS+ Planned Commitments

RB FUND

Fund

BCWP

BCWS+ Planned Commitments

BCWS

CY 2003CY 2002


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AntiAnti--Coincidence Detector Coincidence Detector -- David Thompson, GSFCDavid Thompson, GSFC

• ACD design is essentially complete– Some mechanical interference issues are being

resolved• Detector/Electronics End-to-End testing

– Required performance confirmed with flight-type scintillator Tile Detector Assembly (TDA), phototubes (PMT), High Voltage Bias Supply (HVBS), Front End Electronics (FREE) card

• Fabrication of mechanical structure is underway– Composite shell and aluminum base frame are in

fabrication

FREE Card

HVBS

Signals from TDAs, PMTs Full-size composite

panel for shell


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Composite Panel & ConvertersItaly, SLAC

Tray Assembly and TestItaly

342

342

Tracker Tracker –– Robert Johnson, UCSCRobert Johnson, UCSC

SSD Ladder AssemblyItaly

2592

SSD Procurement, TestingJapan, Italy, SLAC

10,368

Electronics Design, Fabrication & Test

UCSC, SLAC648

Cable PlantUCSC

Tower StructureItaly, SLAC

Tower Assembly and Test (18)

Italy

18

16 flight modules + 2 spares


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Calorimeter Calorimeter –– Neil Johnson, NRLNeil Johnson, NRL

CDE AssemblyNRL

PIN Diode(each end)

CsI Crystal

Optical Wrap

Twisted Pair Wires

Mechanical StructureFrance (IN2P3/Ecole Polytechnique)

Front-End ElectronicsNRL, SLAC

PEM AssemblyNRL

Module Assemblyand Test, NRL+collab

CsI CrystalsSweden (KTH)

16 flight modules + 2 spares

1728

18

18

72

18


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Data Acquisition Data Acquisition –– GuntherGunther Haller, SLACHaller, SLAC

Empty boxes for heat conduction (5x)

Event Processing Unit (3x)

Power Distribution Unit

Global trigger ACD Signal Unit

Spacecraft Interface Unit (2x)

Tower Power Supply (16x)

Tower Electronics Module (16x)


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Hole to accommodate solar array mast

Radiator

Cut-outs for solararray launch locks

VCHP reservoirs

Radiator Mount Bracket at 4 corners of Grid

Grid

Mechanical Mechanical –– Marc Campell, SLACMarc Campell, SLAC


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1X4 Engineering Model under test1X4 Engineering Model under test


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Flight Grid after rough machiningFlight Grid after rough machining


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LAT I&T LAT I&T –– Elliott Bloom, SLACElliott Bloom, SLAC

I&T FacilitySLAC Bldg 33


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Engineering ModelsEngineering Models

Calorimeter EM

1 X 4 Grid

Tracker Minitower


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LAT Engineering ModelLAT Engineering Model


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Cosmic Ray Tracks in the EMCosmic Ray Tracks in the EM

GLASTOnlineSingle Event Display

Preliminary Cosmic Ray

Data taken on Sept 3 !!!

CAL •Pedestal subtracted •Zero suppress off•4 range off

Preliminary data


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Project IssuesProject Issues

1. Transition to flight hardware productiona. Closing design issuesb. Qualification testing

2. Aggressive cost and schedule plana. 9 weeks of schedule float and 25 % cost contingency

3. Communicationsa. Multi-disciplinesb. Work spread around the world

4. End to end performance assessmenta. Assuring that the instrument will meet science

requirementsb. PI has established a task force


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StatusStatus

• Project cost and schedule reviewed– Strong sponsor support– Cost and schedule is still tight

• LAT Design is mature– Instrument configuration is well understood– Details need to be closed

• Transition to manufacture of flight hardware– Complete detailed design and analysis– Thorough testing

• Subsystem modules tests• System tests• Engineering model tests• Hardware qualification testing

• Next 6 months critical to closing issues and beginning fabrication


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SummarySummary

• A new capability is in place at SLAC– Managing, fabricating and operating a space instrument

• Draws on previous experience in particle detectors and space instruments

• New facility at SLAC for instrument integration and test• Specialists in space technology added to the staff• Working relationships in place

– NASA and DOE– NRL, GSFC, UCSC and collaborators– US, Italy, Sweden, Japan and France

– This staff and these facilities are an important resource for supporting further Astro-Physics projects

• GLAST will provide important opportunities for scientific discovery through 2017

GLAST Large Area Telescope Gamma-ray Large Area … Large Area Telescope ... SSD Ladder Assembly...

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