GLAST LAT ProjectIntegration and Test CDR Peer Review, March 28, 2003 Document: LAT-PR-01779-01 Section 5 - Page 1 GLAST Large Area Telescope: I & T Peer

GLAST LAT Project Integration and Test CDR Peer Review, March 28, 2003

Document: LAT-PR-01779-01 Section 5 - Page 1

GLAST Large Area Telescope:GLAST Large Area Telescope:I & T Peer Review

I&T Test Plans

Brian GristSU-SLAC

Subsystem Engineer

[email protected]

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



OutlineOutline

• Test flow• Plan Overview• Readiness Reviews• Test Plans (Sequence, Plan Flow, Requirements-From

Mechanical Systems, Facilities)– Comprehensive/Limited Performance

• Redundancy Verification– Survey– Mass Properties– Modal– EMI/EMC– Sine Vibration– Acoustic– TBAL/TVAC– Airplane Test (TBR)



Integration and Test FlowIntegration and Test Flow

ObservatoryIntegration

Sine Vibe

TowerIntegration

LATIntegration

LAT Test ObservatoryIntegration

TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD

IntegrateE-Boxesw/ Grid

Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C

Final MassProperties

Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon

IntegrateTKR/CAL &TEM's with

Grid

SurveyO

Integrate ACD

SurveyO

Integrate EMISkirt, Htr Switch

Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L

ElectricalInterfaceTests

ComprehensivePerformance

Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT



Test Plan DirectiveTest Plan Directive



ReviewsReviews

• Test Readiness Review- LAT-MD-00408 LAT Instrument Performance Verification Plan– A test readiness review will be conducted prior to commencing a flight level test

program as required in the Systems Engineering Management plan, LAT-MD-00066. This review will be imposed upon all subsystem and system level qualification and flight level test programs. Topics to be addressed at the review are:

• Changes since CDR• Test Requirements• Planned tests• Test Entry / Exit Criteria• Test facilities• Equipment calibration• Test configurations• Test procedure status• Staffing plans• System performance review• Quality program review• Problem / failure reports• Risk assessment• System safety• Test schedule• Issues and concerns



Comprehensive and Limited Performance TestsComprehensive and Limited Performance Tests

• The system level Performance tests requirements flow from the subsystems and system engineering.

• The Integration and Test plan to implement the Electrical Performance test is LAT-MD-01055.


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow

Integration and Test Flow

LATPerformance &Operation Test

Plans

Subsystem TestPlans

LAT Instrument PerformanceVerification Plan

LAT Integration & Test Plan

LAT Contamination ControlPlan

Electrical Performance Tests

Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities

Tracker Tower TestPlan

LAT-TD-00155

Calorimeter TestPlan

ACD Test Plan

Thermal S/S TestPlan

Mechanical S/STest Plan

LAT-SS-00493

TEM

GASU

SUI

EP PDU

LAT EMI TestsElectronics Test

Plan

LAT Instrumentation Plan

W. Davis

ComponentAliveness Tests

SubsystemIntegration Tests

LAT LimitedPerformance

Tests

LATComprehensive

PerformanceTests

LAT OperationalPerformance Tests

E. Gawehn

L. Wai

E. GawehnM. Lovellette

L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette

J. CullinanE. Gawehn

Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050

LAT Flight SoftwareTest Plan

LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587

LAT EMI/EMC Test Plan

T. LeisgangM. Lovellette

LAT Thermal Test Plan

J. WangM. LovelletteLAT-MD-01600

Thermal Tests

M. Lovellette E. GawehnLAT-MD-01837

LAT Dynamics Test Plan

Y IsmaelM. LovelletteLAT-MD-01196

Mechanical Weight & CG

E. GawehnLAT-MD-01598

L. Wai

LAT Survey & Alignment

L. Wai LAT-MD-01586

LAT Survey Plan

M. NordbyL. WaiLAT-TD-00895

LAT Handling&Transportation Plan

T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number

LAT Mechanical Integration

L. Wai E. GawehnLAT-PS-00676

R. ClausLAT-MD-01533

LAT-MD-00446

S. Ritz




• Comprehensive and Limited Performance Tests- LAT-MD-00408 LAT Instrument Performance Verification Plan

– Comprehensive performance tests will be developed for use in support of LAT testing. LAT CPT testing will demonstrate the operation of all primary and redundant circuitry and paths for all operational modes.

– Parameters will be varied over their specification ranges to insure that the unit performs as designed.

– These tests will be performed to provide baseline data for each level of assembly.

– A CPT will also be conducted during the hot and cold extremes of the temperature test or the thermal-vacuum test and at the conclusion of the environmental test sequence as well as at other times as needed in the verification procedures.

– The LAT CPT will demonstrate that the hardware and software meet their performance requirements.

– The CPT will also demonstrate that the instrument produces the expected responses. At lower levels of assembly, the test will demonstrate that, when provided with appropriate inputs, internal performance is satisfactory and outputs are within acceptable limits.

– Limited Performance tests will be a subset of the CPT and will be performed before during and after environmental tests as appropriate




Test Name Type Power S/C Interface Test Point LPT

LAT Initialization Power-Up/Boot

1553 Bus Interface 1553 Bus

SC Command Interface LAT Commanding

Housekeeping Data Telemetry

Science Data Collection Telemetry

GPS Time and GRB Alert Timing

CPU-to-CPU Communication FSW Internal

Configuration and Read back FSW Internal

LAT Environmental Sensors FSW Internal

Front End Strobe FSW Internal

Front End Charge Scan FSW Internal

TKR Cosmic Ray Trigger I&T

CAL Cosmic Ray Trigger I&T

ACD Cosmic Ray Trigger I&T

High Rate Trigger I&T

Event Filtering FSW Internal

LAT Pointing Calculation FSW Internal

Pointing Request Handling SC Commanding

Mode Operations LAT Commanding

Diagnostics and Calibration FSW Internal

Thermal Control System Thermal Control

Source: LAT Electrical Performance Test Plan (LAT-MD-01055) DraftSource: LAT Electrical Performance Test Plan (LAT-MD-01055) Draft



Redundancy TestingRedundancy Testing

• A sequence of online “schema” (configurations) will be defined which mask out individual or combinations of Front Ends, Readout Controllers, Cable Controllers, TEMs.

• The tests will consist of looping through the schema and taking test data to validate the redundant electrical paths.

• LAT Electrical Performance Test Plan (LAT-MD-01055) details the redundant path testing.



Survey PlanSurvey Plan

• The system level survey requirements are defined in LAT-TD-00895.

• The Integration and Test plan to implement the survey program is LAT-MD-01586.


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow w/ survey plans highlighted

Integration and Test Flow w/ surveys in red


Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz



Survey Test OrganizationSurvey Test Organization

• Survey program goals - LAT-TD-00895, LAT Survey Plan

– Verify as-integrated interface stay-clears

– Verify LAT alignment requirements

– Verify science performance requirements

• Validate analytical thermal-mechanical analysis models

• Develop correlation functions for thermal-mechanical distortion

• Predict the expected on-orbit precision of the instrument

Source: LAT-MD-01586 LAT Survey and Alignment Plan

TKR Acceptance Muon SurveyLAT Integratio n

Reference Muon SurveyLAT Integratio n

Muon SurveyNRL T -Va c

TKR Optical SurveyLAT Integratio n

Reference Optical SurveyLAT Integratio n

ACD Optical SurveyLAT Integratio n

Star Tracker Optical SurveySpacecraft Integratio n

On-orbit SurveyProton sM uon s

On-orbit PointingCelestia l Point S ource(s )



Survey TestsSurvey Tests

1A: 1-Toweroptical survey

Integrate Towers Int. ACD Ship/Vibe T-Bal/T-Vac

1B: 4-Toweroptical survey

2A,B,C: LAT baselinemuon survey

1C: 16-Toweroptical/muon survey

3A: Pre-T-Vacmuon survey

4A,B,C: T-Vac muonsurvey at temp

# Goal When/Where Orient. Method Support/Configuration Cooling Temp

1AVerify SS stayclears, TKR alignment accuracy

SLAC, after 1st TKR module is integrated

+Z Up Optical4 corners on GPR; 1 TKR/CAL/ TEM tower integrated. LAT off

None RT

1BVerify SS stayclears, TKR alignment accuracy

SLAC, after 4 TKR modules are integrated

+Z Up Optical4 corners on GPR; 4 TKR/CAL/ TEM towers integrated. LAT off

None RT

1CVerify SS stayclears; establish baseline position of all TKR's

SLAC, before ACD integration

+Z HorizOptical/

Muon3 mid-sides on GPR; ACD not on LAT on. Push on 4th mid-side.

Elec: forced air; Det: conduction

17 C

2A Verify ACD stay-clearsSLAC, after ACD and X-LAT Plate integration

+Z Up Optical4-corners on GPR; ACD integrated. LAT off.

None RT

2BEstablish baseline position of TKR's with ACD on

SLAC, after CPT +Z Horiz Muon 3 mid-sides on GPRElec: forced air; Det: conduction

17 C

2CCharacterize gravity effect on TKR position w/ ACD

SLAC, after CPT +Z Up Muon 3 mid-sides on GPRElec: forced air; Det: conduction

17 C

3ARe-baseline TKR positions after transport, vibe

NRL, after vibe and before T-Vac pump-down

+Z Horiz Muon 3 mid-sides on T-Vac STEElec: forced air; Det: conduction

17 C

4ACharacterize thermal effects on LAT at min temp

NRL T-Vac Chamber +Z Horiz Muon 3 mid-sides on T-Vac STEElec: X-LAT Pl, Det: conduction

-5 C

4BEstablish baseline position of TKR's at nom operating temp


8 C

4CCharacterize thermal effects on LAT at max temp


17 C

LAT Optical and Muon Surveys During Integration and TestLAT Optical and Muon Surveys During Integration and Test

Source: LAT-MD-00895 “LAT Instrument Survey Plan”

>3 Cosmic Ray test for continual

monitoring.



Optical Survey Test Equip and SetupOptical Survey Test Equip and Setup• The optical surveys will be performed with a laser tracker supplied by the SLAC Metrology Department.• The Laser tracker(s) require continuous line of sight to the sphere mounted reflector as it is moved from the laser

tracker test point to the measurement point. • The laser tracker will be mounted on stands to allow the laser tracker to view all reflectors. • All surveys will be performed in the SLAC Building 33 LAT integration facility.• Room temperature controlled to within 5 oC (TBR)• I&T will provide the Survey Scientist for analysis of data from surveys

Equipment/Tool Quantity/Unit Supplier

Laser tracker 1 portable unit SLAC Metrology Dept., Alignment Engineering Group

1-1/2” sphere mounted reflectors

66 reflectors w/ bushings SLAC Metrology Dept., Alignment Engineering Group

¾” sphere mounted reflectors 18 reflectors w/ bushings SLAC Metrology Dept., Alignment Engineering Group

Surveyor 2 workers x 11 times x 4 hrs

SLAC Metrology Dept., Alignment Engineering Group

Tracker top tray “hat” 17 units TKR subsystem

Flight grid reamed holes 4 holes x 4 sides Mechanical subsystem

ACD mounting points 3 points x 4 sides ACD subsystem

Feeler gauges 2 units I&T

= reflector

= laser tracker

GRID

TKR

GPR

Source: LAT-MD-01586



Mass PropertiesMass Properties


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz

• The Integration and Test mass properties measurement plan is: Mechanical Weight and CG Plan LAT-MD-01598



Mass PropertiesMass Properties

• WEIGHT DETERMINATION

– Weights of all LAT flight subsystem and MGSE elements will be measured to an accuracy 0.025% of its determined weight.

• CENTER OF GRAVITY MEASUREMENT

– Cg measurement of all LAT flight subsystem elements will be performed to an accuracy of ±1.0 mm [± 0.039 inch]for X, Y and Z axes (axes as defined in LAT-TD-00035, LAT Coordinate System).

– Cg measurement of the integrated LAT (minus radiator hardware as described above) will be performed to an accuracy of ±2.0 mm [± 0.079 inch] in the X and Y axes and Z axes.

– Cg measurement of the LAT Vibe Test Fixture will be performed to an accuracy of ±2.0 mm in the X, Y and Z axes.

– Cg measurement of the LAT Transport Container will be measured to within ± 152 mm [± 6 inches] for the X, Y and Z axes.

• Definition of the LAT Transport Container axes is to be consistent with the LAT when mounted inside the container.



Modal SurveyModal Survey

Modalsurvey Observatory

Integration

Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyME

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz

• The system level requirements are defined in the LAT Dynamics Test Plan LAT-TD-001196.

• The I&T plan to implement the Modal Survey is in the LAT Dynamics Test Performance Plan LAT-MD-01836.



LAT Modal SurveyLAT Modal Survey

• Test goals– Validate the LAT structural finite element analysis (FEA) model by

correlating with test results– Measure all primary modes of the LAT/Grid structure. – Measure the first mode, and all modes predicted to have high

mass participation, for every subsystem– Measure as many natural frequencies of the LAT up to 150 Hz as

practical – Test results will be used to evaluate the predicted expected modal

frequencies and mode shapes, and used to modify the structural FEA, if needed.

– Finalize test environments and notching plans for sine vibration testing

• Configuration– Fully integrated, except the Radiators are not mounted– Supported off of its spacecraft (SC) mount brackets, – +Z-axis point vertically up– LAT powered off during testing

Source: LAT-MD-01196-01, “LAT Dynamics Test Plan,” March 2003



LAT Modal SurveyLAT Modal Survey• Instrumentation

– High-precision accelerometers mounted to the LAT and test stand

• Specialized test equipment requirements

– LAT supported by the Vibe Test Plate which provides a rigid support of each mount point

– Vibe Test Plate sits on a massive base-isolated table, to damp high-frequency base noise being transmitted to the structure

– Excited using two stingers, located under the LAT

LAT +X

LAT+Y

TKR (z = 640 mm)

CAL (z = -27 mm)

X-TKR

Y-TKR

Grid ( z = 0 mm)

X-TKR

X-TKR X-TKR

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-CAL

Z-TKR

Z-TKR

Z-TKR

Z-TKR

Z-TKR

Z-TKR

0 1 2 3

4

Y-TKR

Y-TKR

Y-TKR

Y-TKR

765

1098

1514

13

12

11

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-GridXYZ-Grid

XYZ-Grid

XYZ-Mnt XYZ-Mnt

XYZ-MntXYZ-Mnt

Y-TKR

X-TKR

X-TKR

X-axis Accel

Y-axis Accel

Tri-axis Accel

Z-axis Accel


LAT +Y

LAT +Z

ACD: outer surfaceof honeycomb

Tri-axis Accel

Out-of-PlaneAccel

LAT +X

Y-ACD

Z-ACD

X-ACD

Y-ACD

XYZ-ACD

XYZ-ACDXYZ-ACD

XYZ-ACD

X-ACD

LAT +X

LAT+Y

Elec (z = -500 mm)

CAL (z = -251 mm)

0123

47 6 5

10 9 8

15 14 13 12

11

X-axis Accel

Y-axis Accel

Tri-axis Accel

Z-axis Accel

PDU

SIU

SIU

EPU EPU

EPUMTY MTY MTY

MTY MTY

GASU

XYZ-CALXYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-Elec

XYZ-Elec

XYZ-Elec

XYZ-Elec

XYZ-Elec

ACD Accelerometer ACD Accelerometer PlacementPlacement

CAL Bottom and E-Box Accelerometer PlacementCAL Bottom and E-Box Accelerometer PlacementTKR, CAL, and Grid Accelerometer PlacementTKR, CAL, and Grid Accelerometer Placement



LAT Modal Survey TestLAT Modal Survey Test

• Test sequence– Excite LAT at two -X corners in the Z-direction, in phase– Excite LAT at two -X corners in the Z-direction, 180 degrees

out of phase—intended to excite LAT “potato chip” mode and other anti-symmetric twisting modes

– Excite LAT at two -X corners in the X-direction, in phase—intended to excite LAT, ACD, TKR, and CAL lateral modes

– Excite LAT web crossings on either side of the Grid center from the underside—intended to excite LAT drumhead mode

• Test levels– TBD– Levels will be set, based on pre-test analysis using as-

measured damping coefficients for subsystems




Modal Test SetupModal Test Setup

• Test will be at SLAC because we will need to remove ACD to uninstall/install appropriate accels before shipment to NRL.

• Soft Suspension System With Mass Loaded Interface

• Pneumatic Isolators used to support system (provided by NRL)

• LAT Mounted to Steel Plate - Reaction Mass (provided by SLAC)

• NRL will provide the monitoring equipment

• Test accelerometers are supplied by TBD depending on final release of the Instrumentation Plan .



EMI/EMC TestsEMI/EMC Tests


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz

• The system level requirements are defined in the LAT EMI/EMC Test Plan (TBD).

• The I&T plan to implement the EMI/EMC Test is in the LAT EMI/EMC Test Performance Plan LAT-MD-01838.



EMI/EMC TestsEMI/EMC Tests

• Purpose– Ensure compatibility of LAT with

other space vehicle systems– Ensure compatibility of other space

vehicle system with LAT– Demonstrates that adequate margin

exists between susceptibility and noise levels

• Configuration– LAT will be integrated with EMI

skirt, X-LAT plates installed and radiators not installed

• Applicable Documents– LAT EMI Test Plan, LAT-MD-TBD– LAT Environmental Parameters

Specification, LAT-SS-00778– LAT Program Inst. Performance

Verification Plan, LAT-MD-00408– MIL-STD-461E– GSFC 433-RQMT-0005 (Draft)

Table II. EMI Requirements Applicability (TBD)

EMI RD Top Level of AssemblyTest Level Para. # Note S/C Comp.(6) INST

Conducted Emission TestsDC Power Leads 5.2, 6.2 X XSpikes DC Pwr 5.2 X X XAntenna Terminals 5.13, 6.13 X XPower Quality Ripple and Noise 4.2 2 XRadiated Emission TestsDC Magnetic Fld/Properties Sys 4.1, 4.7 4 XDC Magnetic Fld/Prop. Comp. 5.7, 6.7 X XAC Magnetic Field System 4.1 XAC Magnetic Field Component 5.1, 6.1 X XElectric Fields System 4.1 XElectric Fields Component 5.1, 6.1 X XAntenna Port Emission S/C 6.13 5 X XConducted Susceptibility TestsPower Line 4.4, 5.4, 6.4 X XIntermodulation Products 6.13 XSignal Rejection 6.13 XCross Modulation 6.13 XPower Line Transients 4.4, 5.4, 6.4 X XRadiated Susceptibility TestsElectric Fields and General EMC 4.3, 5.3, 6.3 3, 4 X X XEMC with Spacecraft Tx 4.3, 5.3, 6.3 3, 4

3, 4XX

XX

XX

Unintentional Electric Field 4.3, 5.3, 6.3 X X XMagnetic Field Susceptibility 4.3, 5.3, 6.3 2 X X XS/C = Spacecraft LevelComp = Component Level INST = Instrument

Tx = Transmitters

Notes 2 Performed at system and subsystem level only3 Definition of susceptibility defined in individual test plan per paragraph 4.34 System level requirement met by analysis and comparison of system and lower level of assemblytest data5 System level test performed as part of radiated EMC with Spacecraft Transmitters6 These are the design requirements. Delineation of Qualification and Acceptance Test requirementsvs level of assembly is specified in Tables IV and V.

Source: GSFC 433-RQMT-0005 (Draft)



EMI/EMC Test SuiteEMI/EMC Test Suite

Test Description Range RE101 Radiated Emissions 20 Hz to 50 kHz RE102 Radiated Emissions 10 kHz to 18GHz CE101 Conducted Emissions 10 Hz to 10 KHz CE102 Conducted Emissions 10 kHz to 10 MHz RS101 Radiated Susceptibility 20 Hz to 50 kHz RS103 Radiated Susceptibility 2MHz to 40 GHz CS101 Conducted Susceptibility 30 Hz to 150 kHz CS114 Conducted Susceptibility, bulk

cable injection 10 kHz to 200 MHz

CS115 Conducted Susceptibility, bulk cable injection, impulse excitation

N/A

CS116 Conducted Susceptibility, damped sinusoidal transients, cables and power leads

10 kHz to 100MHz

•Actual test levels will be updated from those shown



EMI/EMC Testing FacilityEMI/EMC Testing Facility• EMI/EMC Testing will be performed at the

NRL facility• 2 Chambers, GLAST is currently

scheduled to use the smaller chamber• 19' clearance tip to tip on the cones• door 10.5' wide by 10' high, 0.5" rise from

exterior floor (minimal floor rise is reason for selecting this chamber)

• Capable of MIL-STD-461 testing up to 18 GHz RS, 40 GHz RE

Photo caption: Windsat @ NRLAnd there is a bigger chamber.



Sine Vibration TestSine Vibration Test


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz


• The I&T plan to implement the Sine Vibration Test is in the LAT Dynamics Test Performance Plan LAT-MD-01836.




• Test goals– Verify the LAT’s ability to survive the low frequency launch

environment– Test for workmanship on hardware such as wiring harnesses, MLI,

and cable support and strain-reliefs which will not have been fully verified at the subsystem level

– Interface verification test for subsystem structural interfaces to the LAT Grid

– Qualify LAT-SC interface• Configuration

– Fully integrated, except the Radiators are not installed– Supported off of its spacecraft (SC) mount brackets, on the

Vibration Test Stand – The LAT is tested in all three axes, X, Y, and Z independently,

requiring re-configuration between tests– The LAT is powered off during sinusoidal vibration testing, and

the EGSE cable harnesses removed





• Instrumentation– Accelerometers mounted to the

LAT and test stand, to cover the entire dynamic range predicted for the LAT and subsystems (LAT Instrumentation Plan, LAT-MD-00890)

• Specialized test equipment requirements– The Vibe Test Stand must

support the LAT at the SC interface with flight-like connections

– The Stand must allow for reconfiguration to alternate axes, with the LAT attached, to avoid unnecessary handling

LAT +X

LAT+Y

TKR (z = 640 mm)

CAL (z = -27 mm)

Grid ( z = 0 mm)

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-TKR

0 1 2 3

4 765

1098

15141312

11

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-GridXYZ-Grid

XYZ-Grid

XYZ-Mnt XYZ-Mnt

XYZ-MntXYZ-Mnt

X-axis Accel

Y-axis Accel

Tri-axis Accel

Z-axis Accel

XYZ-TKRXYZ-TKR XYZ-TKR XYZ-TKR

XYZ-TKR XYZ-TKR XYZ-TKR


XYZ-TKR XYZ-TKR XYZ-TKRXYZ-TKR


TKR, CAL, and Grid Accelerometer PlacementTKR, CAL, and Grid Accelerometer Placement



Sine Vibration TestSine Vibration Test• Test sequence

– X-Direction Sine Vibe• Low-level vibration to verify that all instrumentation is operational• Low-level random vibration signature of the entire frequency range• Acceptance level sweep• PFQ level sweep• Low-level random vibration signature• Limited Performance Test—re-connect E-GSE cabling; execute LPT while still on

vibe test stand– Y-Direction Sine Vibe

• Low-level random vibration signature• Acceptance level sweep• PFQ level sweep• Low-level random vibration signature

– Z-Direction Sine Vibe• Low-level random vibration signature• Acceptance level sweep• PFQ level sweep• Low-level random vibration signature• Limited Performance Test—re-connect E-GSE cabling; execute LPT while still on

vibe test stand• Test levels

– Levels will be established with pre-test analysis to 1.25 times the static-equivalent acceleration values, without exceeding interface limit loads

Qualification Sine Vibration Test LevelsAxis Freq. (Hz) Test levels Sweep Rate

Thrust 5 to 7.4 1.27 cm (0.5 in.) double amplitude 2 octaves/min7.4 to 50 1.4 g (zero to peak)

Lateral 5 to 6.2 1.27 cm (0.5 in.) double amplitude 2 octaves/min6.2 to 50 1.0 g (zero to peak)

LAT Sine Vibration Minimum LAT Sine Vibration Minimum Test LevelsTest Levels

Source: LAT-SS-00778-01, “LAT Environmental Specification,” March 2003


44

4



Sine Vibration Test FacilitySine Vibration Test Facility

Facility Capability

• Four electrodynamic shakers (one 40-klb, one 30-klb, and two 18-klb)

• Two slip tables

• Three power amplifiers

• The 40-klb shaker will be replaced with a 50-klb unit ~ Nov 2003

• LAT will use the 50-klb unit

Photo caption: Coriollis during vibration testing @ NRL

Testing will be performed at the NRL Naval Center for Space Technology



Acoustic TestAcoustic Test


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz


• The I&T plan to implement the Acoustic Test is in the LAT Dynamics Test Performance Plan LAT-MD-01836.



LAT Acoustic TestLAT Acoustic Test• Test goals

– Verify the LAT’s ability to survive the acoustic launch environment

– Test for workmanship on LAT hardware, especially that hardware which responds to acoustic loading

– Validate the acoustic analysis• Configuration

– LAT is fully integrated, including the Radiators– Mounted to STE using the flight-configuration bolted

joint– LAT +Z-axis vertical, and with Radiators integrated to

the Grid as well as to the STE at the SC strut mount points

– LAT is powered off during acoustic testing, and the E-GSE cable harnesses removed

• Instrumentation – Accelerometers mounted to the LAT and test stand

(per LAT Instrumentation Plan, LAT-MD-00890)– Microphones mounted around the LAT

• Specialized test equipment requirements– The Vibe Test Stand must support the LAT in the

same degrees of freedom as the SC flexures, to avoid over-constraining the Grid and Radiators

– The STE fills the volume between the Radiators, so must approximate the acoustic behavior of the SC

LAT +X

LAT+Y

TKR (z = 640 mm)

CAL (z = -27 mm)

Grid ( z = 0 mm)

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-CAL

XYZ-TKR

0 1 2 3

4 765

1098

15141312

11

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-Grid

XYZ-GridXYZ-Grid

XYZ-Grid

XYZ-Mnt XYZ-Mnt

XYZ-MntXYZ-Mnt

X-axis Accel

Y-axis Accel

Tri-axis Accel

Z-axis Accel

XYZ-TKRXYZ-TKR XYZ-TKR XYZ-TKR



XYZ-TKR XYZ-TKR XYZ-TKRXYZ-TKR

LAT +X

LAT +Z

Radiator Inner Facesheet

Tri-axis Accel

Y-axis Accel

TKR, CAL, and Grid Accelerometer PlacementTKR, CAL, and Grid Accelerometer Placement

Radiators Accelerometer PlacementRadiators Accelerometer Placement




LAT Acoustic Test (cont)LAT Acoustic Test (cont)• Test sequence

– Low-level acoustic to verify that allinstrumentation is operational andtaking useful data

– Acceptance level test—ramp up soundpressure level (SPL) to AT levels

– PFQ level test—ramp up SPL to QTlevels

– Ramp down SPL and turn off– TBD modal signature test– Limited Performance Test—re-connect

E-GSE cable harnesses and execute LPT

• Test levels– Fairing SPL’s are shown– Final SPL’s for testing will be

determinedby pre-test analysis, to factor in fill-fractionin acoustic chamber

Acoustic Loading

100

105

110

115

120

125

130

135

140

145

150

10 100 1000 10000Frequency (Hz)

So

un

d P

ress

ure

Lev

el (

dB

)

Accept Tes t (dB)

Qual Tes t (dB)

LAT Acoustic Test LevelsLAT Acoustic Test LevelsSource: LAT-SS-0077801, “LAT Environmental Specification,” March 2003




NRL Acoustic Chamber NRL Acoustic Chamber

• LAT will mount on a special stand to accommodate radiators. (TBD)

• Support test stand will sit on floor of reverberant acoustic chamber

• NRL chamber capabilities: sound pressure level of 153 dB through a range of 32-10,000 Hz

• Coriolis / Windsat system shown here on test stand

Photo caption: Coriollis/Windsat @ NRL



LAT Thermal Balance/Thermal-Vacuum TestsLAT Thermal Balance/Thermal-Vacuum Tests


Sine Vibe

TowerIntegration

LATIntegration


TKR

CAL

TEM/TPS

Grid

Radiators

EP

SIU

GASU.

PDU

ACD


Htr Box

Delivery

AlivenessTests

LimitedPerformance

X-LAT Plate

C

CLE A

A

MassProperties

EMI/EMC

L

InstallRadiators

Acoustic

L

C

Thermal Vac

ThermalBalance

C L

C


Pre-ShipSurvey

L

A

Ship toSA

F

F

F

EMI SHIELD

Survey Survey

M

O M

L

M

O Optical M Muon


Grid

SurveyO

Integrate ACD

SurveyO


Boxes

Radiator Fit-CHeck

SurveyM

Modalsurvey

E

L

FunctionalTests

Survey:

L



Environmental Tests

E

M

C

v CDR 3/14/03

Integrate X-LAT

Test Plan Flow



Plans

Subsystem TestPlans





Dynamics Tests

LAT SVAC Test Plan

E. Bloom

M-GSE

Facilities


LAT-TD-00155


ACD Test Plan



LAT-SS-00493

TEM

GASU

SUI

EP PDU


Plan


W. Davis




Tests

LATComprehensive

PerformanceTests


E. Gawehn

L. Wai


L. Wai

M. Lovellette

E. do Couto E Silva

M. Lovellette


Particle Test Plan

G. Godfrey

LAT-MD-01376

LAT-MD-01462

E-GSE

M. Huffer

LAT-MD-01386

LAT-MD-01055

LAT-MD-00452

LAT-MD-00404

LAT-MD-00890

LAT-SS-00262

LAT-TD-00296

LAT-MD-00408

ACD-PLAN-000050


LAT-TD-00786

SVAC Plan

E. Do Couto E Silva

LAT-MD-01587





Thermal Tests






L. Wai


L. Wai LAT-MD-01586

LAT Survey Plan



T. Leisgang

LAT-MD-01838

LAT-MD-00440

No Number

LAT-MD-00649

LAT-MD-01836

No Number




LAT-MD-00446

S. Ritz

• The system level requirements are defined in the LAT Thermal Test Plan LAT-TD-001600.

• The I&T plan to implement the TBAL/TVAL Testing is in the LAT Thermal Test Performance Plan LAT-MD-01837.




• Test goals– Thermal-Balance

• Verify that the LAT thermal control system is properly sized to keep maximum temperatures within mission limits, while demonstrating at least 30% control margin

• Validate the LAT thermal control system control algorithms• Verify that the VCHP control effectively closes the radiator to when the LAT is off• Validate the LAT thermal model by correlating predicted and measured temperatures

– Thermal-Vacuum• Verify the LAT’s ability to survive proto-qualification temperature levels at both the

high and low end• Test for workmanship on hardware such as wiring harnesses, MLI, and cable support

and strain-reliefs which will not have been fully verified at the subsystem level• Demonstrate that the LAT meets performance goals at temperature• Provide stable test environment to complete LAT surveys, as detailed in LAT-MD-

00895, “LAT Instrument Survey Plan”• Configuration

– The LAT instrument will be fully integrated but the SC solar arrays will not be installed– The LAT will be powered on and off during testing per the test procedure– The LAT will be oriented with the Z-axis parallel to the ground to allow all heatpipes to

operate and the +X axis facing up– All MLI blanketing will be in its flight configuration for the duration of the 2 tests– The LAT will NOT be reconfigured after the thermal-balance test

Source: LAT-MD-01600-01, “LAT Thermal-Vacuum Test Plan,” March 2003




• Instrumentation

– Thermocouples and RTD’s will be used to instrument the LAT and test chamber

– LAT flight housekeeping instrumentation includes many thermistors and RTD’s. These will also be used for monitoring temperatures within the LAT

• Specialized test equipment requirements

– Chamber pressure of < 1 x 10-5 Torr

– Chamber cold wall temperature of –180 oC to provide a cold sink for accumulation of contaminants

– Thermally controlled surfaces in the chamber

• 5 plates for ACD surfaces, each individually controlled

• 2 plates for the radiators(one for each side), each individually controlled

• 1 plate to simulate the bus, controlling the environment to the X-LAT Plate and the back of each radiator

– Heat exchangers mounted on the + / – X sides of the LAT Grid, to increase ramp rate during transitions

– LAT heat pipes will be leveled to within 0.2 degrees

– 20 degC/hr max ramp rate

– Facility capable of holding LAT stable to < 2 oC/hr rate of change (TBR)

– Handling fixture to allow the transition from acoustic test to TVAC without breaking radiator configuration




LAT Thermal Balance/Thermal-Vacuum Test ProfileLAT Thermal Balance/Thermal-Vacuum Test Profile

• Dwell at high and low temps for 12 hours, min• Limited Performance Tests conducted during transitions• Comprehensive Performance Tests (C)

– CPT test regime performed at ambient, during cold and hot soaks, and at return to ambient

• Limited Performance Tests (L)– LPT test regime performed as indicated. Operating modes

will be checked and units will be monitored for failure and intermittent operation




LAT Thermal Balance/Thermal-Vacuum Test ProfileLAT Thermal Balance/Thermal-Vacuum Test Profile

LAT Thermal-Vacuum Test ProfileLAT Thermal-Vacuum Test Profile


T-Vac Cycles

1 2 3 4

Bake OutHot T- Bal

Cold T-Bal

Cold SurvT-Bal

Ambient Pressure, Temp Pressure < 1x 10-5 Torr

T-Bal

Pump-Down Repress

Warm-up

Hot QT

ColdQT

LAT Off

CPT

Cold Start

CPT

CPT CPT

LAT Off

Muon Survey

Muon Survey

Muon Survey

LPT LPT CPT

LPT LPT CPT

LAT On

LAT On

Hot QT



Thermal Test FacilityThermal Test Facility

• NRL Naval Center for Space Technology A59 facility

• Cryopumped chamber

• 16’ diameter x 30’ long

• Support 200-300 thermocouples, ~400 other circuits



LAT Airplane Test (TBR)LAT Airplane Test (TBR)

• Expose the LAT to charged particle fluxes similar to those in orbit. Do an End-to-End test of the LAT in as close to orbital environment as practical. This test is for risk reduction.– Demonstrate the complete LAT system functionality at in-

orbit cosmic rates and higher. See LAT-TD-00550 “LAT Test Plan for Airplane”. Constitutes an end-to-end test of the LAT.

• General hardware tests for the complete LAT system at high particle rate:– Verify DAQ operation at estimated orbital rates.– Verify event quality. – Verify trigger functionality in the various trigger modes at

estimated orbital rates. (Much higher than ground cosmic rays).

– Measure livetime in the various trigger modes as determined by LAT hardware.



EXTRA SLIDE



Pass/Fail CriteriaPass/Fail Criteria

• Modal Survey:

– Successful correlation of dynamics model

• EMI/EMC:

– Emissions for the LAT below required levels Susceptibility: LAT does not exhibit susceptibility when exposed to required levels

• Sine vibe:

– No change in modal frequencies

– LAT functions properly post test

• Thermal Balance:

– successful correlation of thermal model

• Thermal vacuum testing:

– Verify ability to operate successfully over required temperature range

– Successful completion of performance tests

– Successful completion of cosmic ray muon survey