lat status environmental testing

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GLAST Large Area Telescope:GLAST Large Area Telescope:

W Neil JohnsonNaval Research Lab

neil.johnson@nrl.navy.mil(202) 767 - 6817

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope LAT StatusLAT Status

Environmental TestingEnvironmental Testing

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LAT StatusLAT Status

LAT completed commissioning at SLAC May 10th.– Determined effort by the Commissioner: Eric Grove– Excellent support leadership from

• System Engineering: Pat Hascall• Electronics/ FSW: Gunther Haller• I&T OnLine: Ric Claus• OffLine: Anders Borgland

Packed up on May 11th and departed by dedicated truck (photos to follow)

Arrived NRL on Sunday, May 14th and installed in clean tent. MGSE and EGSE arrived on Tuesday, May 16th.

Up and running by Wednesday, completed post ship comprehensive performance test on Friday.

Continued calibrations and additional tests thru the weekend. Installed new flight software and completed regression tests by

Wednesday Successfully completed Pre Environmental Review with GSFC on

Thursday. Moved to Vibration Test Lab on Friday. Vibe testing began yesterday.

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SensorsSensors

ACD before installation of Micrometeoroid Shield

1 of 16 Calorimeter modules

1 of 16 Tracker modules

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LAT before installing the ACDLAT before installing the ACD

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LAT with ACD and protective coverLAT with ACD and protective cover

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Data Acquisition System (-Z)Data Acquisition System (-Z)

EPUEPU EPUEPU

EPUEPUSIUSIU SIUSIU

GASUGASU

PDUPDU PDUPDU

GASUGASU

HIBHIB

HIBHIB

HIBHIB

HIBHIB

HIBHIB

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-Z with the Cross LAT plate installed-Z with the Cross LAT plate installed

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LAT on Shipping Container BaseLAT on Shipping Container Base

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Closing up the shipping containerClosing up the shipping container

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Loading LAT on the “IceBreaker”Loading LAT on the “IceBreaker”

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The IceBreakerThe IceBreaker

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Arrival at NRL’s Arrival at NRL’s Naval Center for Space TechnologyNaval Center for Space Technology

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Moving to Vibe LabMoving to Vibe Lab

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Lift on to Vibe TableLift on to Vibe Table

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On Vibe Table for Z-axis TestOn Vibe Table for Z-axis Test

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Weight & CG

Weight & CG

CPTCPT

Sine VibeSine VibeOffload & Set-up LATOffload & Set-up LAT

5 days 5 days 9 days

Install Radiator

s

Install Radiator

s

2 days

EMI/EMC Test

EMI/EMC Test

11 days

Acoustic Test

Acoustic Test

7 days

3 days

RemoveRadiator

s

RemoveRadiator

s

2 days2 days

LAT Test Flow

Pack and Ship

Pack and Ship

2 days

T- BalT- BalPre TVPre TV T- CycleT- Cycle

40 days

CPTCPT

NOTE: Durations for moving and setup have been incorporated into the total duration for the test.

ShipmentShipmentSystem Commissioning/ System Test

System Commissioning/ System Test

5 days

5/11/06

5/16/06

7/10/06

9/15/068 days

PER 5/25/06

PER 5/25/06

PSR 9/13/06

PSR 9/13/06

You Are Here

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ConclusionConclusion

The LAT is complete and tested.– No significant anomalies detected to date, except

• Radiator heaters were damaged during assembly process and are now being replaced

– No performance anomalies detected. Trending shows same instrument throughout assembly and test program.

The LAT Flight Software is essentially complete.– Missing GRB detection algorithm and event filter additions

• Neither particularly relevant for ground testing.• Development will continue on the test bed at SLAC.

New OnLine operating system – LICOS – commissioned

The LAT project has successfully transferred activities (and people) to NRL and is efficiently executing its environmental test program.