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Gamma-ray Large Area Space Telescope. 7E2: EM test plans. GLAST Large Area Telescope: Tracker Subsystem. Nicola Mazziotta University and INFN Bari - Italy [email protected] Outline. Test strategies First results Panel vib plan Tray thermal plan Tower vib plan Tower thermal plan

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7e2 em test plans

Gamma-ray Large Area Space Telescope

7E2: EM test plans

GLAST Large Area Telescope:Tracker Subsystem

Nicola MazziottaUniversity and INFNBari - [email protected]

outline
Outline
  • Test strategies
  • First results
  • Panel vib plan
  • Tray thermal plan
  • Tower vib plan
  • Tower thermal plan
  • EM Matrix plan
  • Reference LAT Documents:
  • LAT-MD-00408, LAT Instrument Performance Verification Plan
  • LAT-SS-00788, LAT Environmental Specification
  • LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up Trays
  • LAT-TD-01249, Thermal Test Results for Pre-Engineering Model Trays
  • LAT-PS-01584, LAT Tracker TraySSD Ladder Panel Assembly Procedure
  • LAT-TD-01004, EM Tray Vibration Test Plan
  • LAT-TD-01037, EM Tray Thermal Test Plan
tray assembly test sequence

Tray factory (panels)

Vibration test

Ladder factory

Tray assembly: ladders and MCMs on trays

Thermal cycles

Stacked cosmic rays*

Electrical test

Fast electrical test*

Tower assembly

Tray assembly&test sequence

* Live trays

tray vib levels
Tray vib levels

White Noise

Sine sweep

Random vibration

tray vib set up
Tray vib set up

W side on the top

  • Accelerometers position:
  • Control: two mono-axial accelerometers positioned on two of the four L-shaped block TP1&TP2
  • Fixture: three mono axial accelerometers placed on a corner on one of the four L-shaped block TP6
  • Tray: one three-axial accelerometer in the middle TP5
  • Centrotecnica set up:
  • - 1 LDS V864LTshake table
  • 2 fixtures
  • 9 read out channels
  • 4 trays/day test rate capability
first results tg07 1
First results – TG07 (1)

Sine sweep before/after random

Random vibration + White noise

Z accelerometer response

X accelerometer response

Y accelerometer response

Resonance search:

0= 815 Hz, Q  51

Resonance check:

0= 809 Hz, Q  49

last vib runs mar 17 19 1
Last Vib Runs (Mar, 17-19) (1)

Light

≈1000Hz

≈660Hz

≈ 800Hz

Heavy tray

Mid tray

last vib runs mar 17 19 2

“Watch-dog”

Last Vib Runs (Mar, 17-19) (2)

Heavy tray (TS05) Q=100 @ 660Hz  Output-expected: 140.4 grms

Applied notching on qual ASD: output ≤ 16 g2/Hz ( Q=10) “Watch-dog”

Input-notched: 13.6 grms

Output-notched: 59.6 grms

em vib runs summary 16 trays
EM Vib Runs Summary (16 trays)

No relevant changes in the resonance frequency after the random

All trays first mode › 500 Hz

thermal tests on pre em trays set up

1 m3

Si Strain gauge

Wheatstone bridge configuration

(Labview)

Reference Strain gauge on quartz

Thermal tests on pre-EM trays: set-up

Procedures: LAT-TD-1037; Pre-EM Results: LAT-TD-1249

Service box

thermal tests on pre em trays some results
Thermal tests on pre-EM trays: some results

Stability @ plateau: dT/dt < 3°C/hr

Tchamber

Tsilicon

Silicon temperature delay  45 min

plateau  5 hr

tray thermal levels
Tray thermal levels

T-C: Thermal cycle (dummy trays)

T-V: Thermal vacuum (live tray)

On orbit temperature range -15°C  30°C

tray thermal sequence
Tray thermal sequence

The EM dummy trays will be tested at ambient pressure into the service boxes

tower vib levels
Tower vib levels

Low frequency sine sweep

White Noise

Random vibration

High frequency sine sweep

tower vib set up
Tower vib set up
  • Accelerometers set up (TBR):
  • 3 axial on the shaker table (control accelerometer)
  • 3 axial on the center of the bottom tray lower surface
  • 3 axial on the center of the top tray upper surface
  • 3 axial accelerometer +X sidewall center of the thermal boss tray number 12;
  • 3 axial accelerometer +Y sidewall near the center of the tray number 10;
  • 3 axial accelerometer +Y sidewall center of the thermal boss of the tray number 1;
  • 3 axial accelerometer +Y sidewall center of the thermal boss of the tray number 19;
  • 3 axial accelerometer -X sidewall center of the thermal boss of the tray number 10;
  • 3 axial accelerometer -Y sidewall near the center of the tray number 10, on the center plane;
tower thermal set up
Tower thermal set up

Tower covered with a thermal blanket during T-V cycles.

The tower has a large number of thermocouples in the read out cables that can be acquired by using the TKR DAQ system.

  • Additional thermocouples (TBR):
  • +Y sidewall center of the thermal boss of the tray number 1;
  • +X sidewall center of the of the tray number 1, on the center plane;
  • +Y sidewall center of the thermal boss of the tray number 19;
  • +X sidewall center of the of the tray number 19, on the center plane;
  • -X sidewall center of the thermal boss of the tray number 10;
  • -Y sidewall near the center of the tray number 10, on the center plane

The temperature control point for the cold part of the cycle will be the coldest thermocouple, while the control point for the hot part of the cycle will be the hottest one.

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