GLAST LAT Project Peer Review, March 24-25, 2003 7E2 1 Gamma-ray Large Gamma-ray Large Area Space Area Space Telescope Telescope 7E2: EM test plans GLAST Large Area GLAST Large Area Telescope: Telescope: Tracker Subsystem Nicola Mazziotta University and INFN Bari - Italy [email protected]t
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GLAST LAT ProjectPeer Review, March 24-25, 2003 7E2 1 Gamma-ray Large Area Space Telescope 7E2: EM test plans GLAST Large Area Telescope: GLAST Large Area.
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GLAST LAT Project Peer Review, March 24-25, 2003
7E2 1
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
7E2: EM test plans
GLAST Large Area GLAST Large Area Telescope:Telescope:Tracker Subsystem
1. LAT-MD-00408, LAT Instrument Performance Verification Plan2. LAT-SS-00788, LAT Environmental Specification3. LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up
Trays4. LAT-TD-01249, Thermal Test Results for Pre-Engineering Model
Trays5. LAT-PS-01584, LAT Tracker Tray SSD Ladder Panel Assembly
Procedure6. LAT-TD-01004, EM Tray Vibration Test Plan 7. LAT-TD-01037, EM Tray Thermal Test Plan
The EM dummy trays will be tested at ambient pressure into the service
boxes
GLAST LAT Project Peer Review, March 24-25, 2003
7E2 15
Tower vib levelsTower vib levels
Frequency(Hz)
ASD Acceptance
Level (g2/Hz)
ASD Qualification Level (g2/Hz)
20 0.01 0.02
20-50 +5.9 dB/oct +5.9 dB/oct
50-800 0.06 0.12
800-2000 -5.9 dB/oct -5.9 dB/oct
2000 0.01 0.02
Overall 8.7 grms 12.3 grms
Duration 1 min/axis 2 min/axis
Low frequency sine sweep
Frequencyrange
20 2000 Hz
Sweep rate 2 oct/min
Target Amplitude
0.5 g0-pk
High frequency sine sweep
Frequency
(Hz)
ASD WN Level(g2/
Hz)
Overall
grms
Duration
(min)
20 ÷ 2000 10-4 0.45 1
White Noise
Random vibration
GLAST LAT Project Peer Review, March 24-25, 2003
7E2 16
Tower vib set upTower vib set up
Accelerometers set up (TBR):1. 3 axial on the shaker table (control accelerometer) 2. 3 axial on the center of the bottom tray lower surface 3. 3 axial on the center of the top tray upper surface 4. 3 axial accelerometer +X sidewall center of the thermal
boss tray number 12;5. 3 axial accelerometer +Y sidewall near the center of the
tray number 10;6. 3 axial accelerometer +Y sidewall center of the thermal
boss of the tray number 1;7. 3 axial accelerometer +Y sidewall center of the thermal
boss of the tray number 19;8. 3 axial accelerometer -X sidewall center of the thermal
boss of the tray number 10;9. 3 axial accelerometer -Y sidewall near the center of the
Additional thermocouples (TBR):1.+Y sidewall center of the thermal boss of the tray number 1;2.+X sidewall center of the of the tray number 1, on the center plane;
3.+Y sidewall center of the thermal boss of the tray number 19;4.+X sidewall center of the of the tray number 19, on the center plane;
5.-X sidewall center of the thermal boss of the tray number 10;6.-Y sidewall near the center of the tray number 10, on the center plane
The tower has a large number of thermocouples in the read out cables that can be acquired by using the TKR DAQ system.
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.
Tower covered with a thermal blanket during T-V cycles.