AMS02 Thermal Test Sequence in the LSS Requests to ESA

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AMS02 Thermal Test - Sequence in the LSS-
Requests to ESA

• Marco Molina (CGS)
• Ivan Corradino (CGS)
• Serena Borsini (UNIPG)

2
Test specifications

• TVTB Test specification issue 1
• November 2007
• ESA required additional information in the
  meeting at ESTEC to allocate the budget and start
  the procurement of the hardware
• Feb 1st 2008
• Subdetectors test requirements collected
• TIM, February 2008
• TVTB Test specification issue 2
• Apr 14th 2008

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Feb 2008- Apr 2008

• Test requirements have been put in a sequence, to
  optimize test duration
• First thermal analysis have been done (S. Borsini
  , UNI PG)
• IR lamps and test hardware to be provided by ESA
  has been identified

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TV test scope

• Functional performance verification of the entire
  detector
• Under vacuum conditions
• At the extreme achievable thermal environment
  (hot and cold)
• Respecting the flight hardware limits (WITHIN
  ACCEPTANCE LEVELS)
• Driven by the test configuration
• TVT stand
• IR lamps
• SUCCESS CRITERION Proper functioning of sub
  detectors and electronics.
• REMARK IT IS NOT A (PROTO)-QUALIFICATION TEST
• Equipments and detectors will not necessarily go
  to their flight extremes

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MATERIALS COMPATIBILITY with vacuum

• NASA-gtESTEC
• AMS flight hardware DML
• AMS-gt ESTEC
• TVT test stand and all hardware used for the test
  outgassing data
• AMS-provided cables
• scaffolding
• AMS-provided piping
• valves
• ESTEC -gt NASA/AMS
• ESA-provided hardware outgassing data
• Lamps and their rigs
• Test MLI
• Test heaters
• ESTEC provided pipes

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LSS shroud

• LSS shroud will provide an isotropic heat sink at
  a temperature between -100C and 50C
• When the shroud is cold, the lightest and most
  exposed parts of AMS may be too cold
• Lower USS electronics

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IR lamps

• IR lamps are used
• To locally warm lightest and most exposed parts
  heat heaters power are not sufficient to keep
  them alive.
• To create temperature gradients in order to
  simulate high Beta angle thermal environment
  (un-balance thermal loading)
• To create temperature gradients RAM-WAKE on the
  tracker radiators (Beta 0 like)

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IR LAMPS
Lamps will be arranged in standard modules
(arranged in a matrix 4 x 2) A module will have a
size of 250 mm x 500 mm.
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LAMP STANDARD MODULE
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Lamp group 1 (AMS bottom)
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LAMP GROUP 2 (ECAL/RICH side)
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LAMP GROUP 3 (TRD side)
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LAMP GROUP 4 (Tracker radiator)
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Lamp groups 5 to 8 TVT stand
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Lamp groups 9-18
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Total IR lamps

• 106 lamps (30 spares)
• 18 independent controllable power supply
• 13.25 kW total

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Venting lines

• cryogenic system (see paragraph 7.5 , connected
  to port A9)
• Xe CO2 venting from TRD (connected to port C2).

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TRD venting

• TRD venting line shall be provided with a thermal
  control based on
• an MLI blanket (with effective emittance lower
  than 0.05), wrapped around the pipe and
• heating power along the pipe, underneath the MLI
  blanket of 2 W per meter length of the tube.
• The target is to keep the TRD venting pipe at
  -25C.

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Temperature sensors

• 350 thermocouples are foreseen for the test
  article.
• LSS shroud temperature shall be monitored with
  50 sensors to provide information on temperature
  uniformity.
• 50 sensors shall be used to monitor the TVT
  stand temperature

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ITEMS TO BE PROVIDED BY ESTEC

• 450 Temperature sensors (thermocouples) (50
  spares)
• Some of them, according to Tab. 8-1 will be
  needed in advance for being pre-installed at CERN
• IR lamps with power supply, controllers and
  cabling, as specified in 7.2.3
• 106 Lamps 30 spares
• 18 independent power supply and controllers for
  the IR lamps
• IR Lamps cabling
• IR lamps rigs
• Venting lines
• TRD gas BOX vent line
• Pipe inside and outside the LSS
• Test MLI (0.05 effective emittance) to wrap-up
  the pipe
• Heaters (2 W / m) underneath the MLI and power
  supply
• Cryogenic system venting (see paragraph 7.5 )
• Feed-through
• AMS Power, Command and Data (see paragraph 7.3 )
• For Helium lines (see figure Fig. 7-2)
• For TRD vent lines
• Test MLI for the LSS floor (as specified in
  paragraph 7.2 )

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Test sequence
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Test sequence

• Time-optimized
• Bake out
• Initial coling down checking thermostats clicking
  AMS activation
• Magnet charge in cold conditions
• Cold Thermal Balance (TB), in steps. Detectors
  are powered on individually and chamber
  temperature is adjusted accordingly
• TRD
• TOF
• TRACKER and TTCS, AST, GPS, ACC
• RICH
• ECAL
• Power outage simulation at the end of the
  stabilization
• Hot thermal balance (all ON)
• A second cold TB, a second hot TB
• Magnet discharge
• Re-pressurization

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At the end of the test each subdetector will have
undergone

• Partial functional test
• At ambient before the test
• In a cold environment (twice)
• In a hot environment (twice)
• Transient data (cooling down in case of a power
  loss) will be collected
• In a cold environment (twice)
• In a hot environment (twice)
• Response of some subdetctors (TRD, TOF) to
  environment variation will
• AMS02 Activation sequence is tested
• Magnet charge and discharge is tested
• High beta-angle (heat unbalance) is tested for
  RICH, ECAL and TRD
• RAM-WAKE unbalance is tested for the TTCS

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Test steps

• Functional checkout before vacuum
• Bake out
• Initial cooling down
• Switch on
• Magnet charge
• Cold thermal balance
• Cold to hot transition
• Hot thermal balance
• Hot to cold transition
• Cold thermal balance number 2
• Hot thermal balance number 2
• Magnet discharge
• Re-pressurization
• Functional checkout at ambient conditions
• End of the test

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Bake out and thermostats check-out (initial
cooling down) - 200 hours
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Switch on sequence and TTCS check-out before
charging the magnet
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Magnet charge 10 hours
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Cold thermal balance - 300 hours
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Detectors switch on sequence in cold thermal
balance

• Sequence is driven by detectors more sensitive to
  cold behaviour
• TRD
• TOF
• Tracker and TTCS, AST, GPS, ACC
• RICH
• ECAL

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Power outage in a cold case - 10 hours
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Hot thermal balance 100 hours
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Power outage in a hot case 10 hours
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Cold TB number 2 80 hours
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Hot TB number 2 80 hours
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Magnet discharge 5 hours
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LSS chamber re-pressurization 30 hours
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Overall duration

• Bake out and thermostats check-out (initial
  cooling down) 200 hours
• Cold thermal balance (5 plateau) 300 hours
• Power outage in a cold case 10 hours
• Hot thermal balance 100 hours
• Power outage in a hot case 10 hours
• Cold TB number 2 80 hours
• Hot TB number 2 80 hours
• Magnet discharge 5 hours
• LSS chamber re-pressurization 30 hours
  .
• TOTAL 815 hours 34 days

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Conclusions

• TVTB test spec document can be found at
• ftp//ftp.cgspace.it/Projects/AMS/TWG/DOC/SPEC/1-L
  SS/TVTB-TEST-SPEC/
• Coming next TIM July 2008
• Test duration stimate
• Time estimate for each detector tests
• Thermal transient calculations
• Temperature ranges achievable for the detectors
• Test procedure to ESTEC Sept 1st 2008