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GLAST LAT Project Peer Review, March 24-25, 2003
7D 1
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
7D: Tray test plans
GLAST Large Area GLAST Large Area Telescope:Telescope:Tracker Subsystem
Nicola MazziottaUniversity and INFNBari - [email protected]
GLAST LAT Project Peer Review, March 24-25, 2003
7D 2
OutlineOutline
OverviewTray test matrixPanel vib planTray thermal planTest scheduleStacked cosmic rays
Reference LAT Documents: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-00154, Tray Vibration Test Plan 7. LAT-TD-01839, Tray Thermal Test Plan
GLAST LAT Project Peer Review, March 24-25, 2003
7D 3
Tray test matrixTray test matrix
Item
Qu
an
tity
Qu
an
tity to
test
Hig
h fre
q s
ine
Sw
eep
Ran
dom
Vib
e
Sta
cked
cosm
ic ra
ys
Fu
nctio
nal
Th
erm
al C
ycle
Test s
ite
Lot A Panels
19 19 Z axis QualZ axis
Italy factory
Lot A Trays
19 19 Qual INFN Perugia (in Terni) (thermal)
Lot B & Flight panels
323 + spares
323 + spares
Z axis Acc Z axis
Italy factory
Lot B & Flight trays
323 + spares
323 + spares
Acc INFN Perugia, Bari, Pisa, RomaII
GLAST LAT Project Peer Review, March 24-25, 2003
7D 4
OverviewOverview
Tray factory (panels)
Vibration test*
Ladder factory
Tray assembly: ladders and MCMs on trays
Tray thermal cycles*
Stacked cosmic rays*
Electrical test
Tray functional test*
Tower assembly*Environmental tests
Electrical test before MCMs
encapsulation
GLAST LAT Project Peer Review, March 24-25, 2003
7D 5
Panel vib levelsPanel vib levels
Frequency (Hz)
ASD QualLevel
(g2/Hz)
ASD AcceptLevel
(g2/Hz)
20 0.026 0.013
20-50 +6 dB/oct +6 dB/oct
50-800 0.16 0.08
800-2000 -6 dB/oct -6 dB/oct
2000 0.026 0.013
Overall 14.0 grms 10.0 grms
Duration 2 min 1 min
Random vibration
Frequency
(Hz)
ASD WN Level(g2/
Hz)
Overall
grms
Duration
(min)
20 ÷ 2000 10-4 0.45 1
White Noise
Frequencyrange
20 2000 Hz
Sweep rate 2 oct/min
Target Amplitude
0.5 g0-pk
Sine sweep
GLAST LAT Project Peer Review, March 24-25, 2003
7D 6
Panel vib set upPanel vib set up
Accelerometers:
•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 accelerometers in the middle of panel TP5
Centrotecnica set up:
- 1 LDS shake table
- 2 fixtures
- 9 read out channels
- 4 tested trays/day rate
×
W side on the top
GLAST LAT Project Peer Review, March 24-25, 2003
7D 7
Panel vib sequence thrust Panel vib sequence thrust axisaxis
Step Description Test Level
1Fixture, tray and
accelerometers mounting
2Fixture calibration and
tray resonance search
Sine sweep 0.5 g 0-pk
3 Random vibrationRandom vibration
Qual (Lot A)Acc (Lot B &
Flight)
4 Normal mode check Sine sweep 0.5 g 0-pk
5 Dismounting
6 Test completion
GLAST LAT Project Peer Review, March 24-25, 2003
7D 8
Tray thermal levelsTray thermal levels
Acceptance Qualification/Survival
Temperature Range -20°C 35°C -30°C 50°C
# of cycles 4 4
Temperature rate 20°C/hr 20°C/hr
Pressure 1 atm T-C 1 atm T-C
Duration @ T extreme
5 hr 5 hr
Total Duration 62 + 2 hr 72 + 2 hr
On orbit temperature range -15°C 30°C
GLAST LAT Project Peer Review, March 24-25, 2003
7D 9
Tray thermal Tray thermal sequencesequence
Step Description Level
0 Functional test
1 Thermocouple set up
2 Chamber set up
3 Thermal cycles Lot A QualLot B&Flight Acc
4 Dismounting
5 Functional test
6 Test completion
The tray will be tested in its own service box.
GLAST LAT Project Peer Review, March 24-25, 2003
7D 10
Test scheduleTest schedule
Vib test rate ≥ 4 panels/day (Centrotecnica-Milano)
Thermal test lot ≥ 4 trays/cycle in 4 climatic chambers (2 ready by Pg in Terni, 1 foreseen in Pi, 1 foreseen in Ba)
Test rate/climatic chamber ∼ 1 tower/month
GLAST LAT Project Peer Review, March 24-25, 2003
7D 11
Cosmic rays testCosmic rays testTray stacked in single view
2 stacks for a whole tower, readout with a single TEM
GLAST LAT Project Peer Review, March 24-25, 2003
7D 12
ConclusionsConclusions• The thermal and vibe tests on trays are well
understood• The vibe test rate in Centrotecnica is
adequate• The thermal test rate with the Perugia
equipment in Terni is just sufficient, but the test lines will be doubled
• The mechanics to perform cosmic rays tests is under construction. The flux allows a test in realistic time. The mini-tower experience will be the ground base to define the cosmic rays test.
