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
W side on the top
Sine sweep before/after random
Random vibration + White noise
Z accelerometer response
X accelerometer response
Y accelerometer response
0= 815 Hz, Q 51
0= 809 Hz, Q 49
No relevant changes in the resonance frequency after the random
All trays first mode › 500 Hz
Stability @ plateau: dT/dt < 3°C/hr
Silicon temperature delay 45 min
plateau 5 hr
T-C: Thermal cycle (dummy trays)
T-V: Thermal vacuum (live tray)
On orbit temperature range -15°C 30°C
The EM dummy trays will be tested at ambient pressure into the service boxes
Low frequency sine sweep
High frequency sine sweep
For each axis
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.
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.