AMS02 Thermal Vacuum and Thermal Balance Tests in the Large Space Simulator at ESTEC J' Burger AMS02

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AMS-02 Thermal Vacuum and Thermal Balance Tests
in the Large Space Simulator at ESTECJ.
BurgerAMS-02 TIMCERN, July 23, 2004
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AMS data sheet

• Size 3.2 m x 5.1 m x 4.1 m in test stand
• Mass 6700 Kg8944 Kg test article
• 10817 Kg crane wt.
• Power 2kW

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Two Meetings at ESA/ESTECNoordwijk,
Netherlandsto request overall AMS-02 TVTin
Large Space Simulator (LSS)

• June 11 2003 - Presentation of AMS request to
  ESA
• S.C.C. Ting Martin Zell Head of Human
  Spaceflight ESA
• Martin Pohl Wolfgang Supper Head of
  Thermal ESTEC
• Joseph Burger Jean Jamar Head of
  Testing ESTEC
• Robert Becker
• July 3, 2003 Follow-up Meeting
• Joseph Burger Jean Jamar Head of
  Testing ESTEC
• Marco Molina Wolfgang Supper Head of
  Thermal ESTEC
• Alexander Grechko Gaetan Piret Test
  Manager ESTEC
• Peter Berges R. Effenberger Managing
  Director ETS
• Y. Hoyet ESTEC
• Matin Zell Head of Human Spaceflight ESA

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LMSO Visit to LSS

• Trent Martin, Phil Mott, Ross Harold, and Craig
  Clark were at ESTEC last year for planning
  acoustic test.
• Also visited the Large Space Simulator

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Large Space Simulator DimensionsUseable Volume
diameter 9.5m, height 10m
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Our Original Request from ESA/ESTEC

• Test equipment
• 300 temperature sensors with DAS and cables
  (provided in advance)
• Test heaters or IR lamps (TBC)
• Cabling Power (120VDC) and data, including
  fiber optics (provided by ESTEC cables inside
  the chamber, feedthrough, cables outside chamber
  to control room)
• Corrugated stainless steel tubes from AMS02
  venting ports to external vacuum pumps for He and
  TRD gas venting
• Space
• Clean room area 150 m2, with 8m crane
  height
• 40 m2 control room for 13 people with
  pc/control terminals
• 30 m2 storage room for shipping equipment
• Personnel - people to operate facility, plus 2
  people full time during integration/deintegration
  (plus crane drivers, )
• Office space for 10-15 people including phones,
  fax, xerox, network plugs
• Other list of elecrical and vent feedthroughs
  needed
• Time original request 42 days in chamber plus 3
  weeks installation and checkout, 2 weeks
  deinstallation and shipping
• Mechanical and electrical interface data
• Thermal model of LSS in SINDA/TRASYS and support
  in using it

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90 ton seismic block can support 60 tonsexternal
dimensions 3.2m x 3.2 mmechanically decoupled
from LSS and building
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Example of mounting HST Solar Wing on block
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Vacuum system typical pumping times
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Vent lines needed for He and TRD gas

• The turbomolecular pumps cannot handle the
  nominal He venting rate of 2 mg/s, nor a TRD gas
  venting, and a cryopump wont work on He
• Vent lines are needed for normal He and TRD gas
  venting and venting from the cryosystem burst
  disk outputs

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Shrouds and Nitrogen Supply

• C1 covering the main chamber
• LN2 mode (lt100K)(max. heat load 170kW)
• or GN2 mode (150-350K) (max. heat load 10kW)
• C2 covering the auxiliary chamber LN2 mode only

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Solar Simulator

• Horizontal beam 6m diameter, 5m deep
• Maximum intensity at nominal lamp power
  2000W/square meter
• Intensity distribution in reference plane within
  /-4

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Thermal Data Handling

• Thermocouple recording
• - 864 t/c internal
• - 216 t/c direct
• Platinum sensors
• - 98 Pt100
• - 8 Pt500
• Power supplies (P-U-I)
• 40 PSU 24 W - 40V 0.6A
• 94 PSU 240 W 80V 6A
• Possibility to record other signals using
  external scanners
• Possibility to send some information using RS232
  link to EGSE
• A total of 2000 channels with a minimum scan time
  of 30 seconds
• User interface using Dynaworks real time display

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WP1 Standard Facility preparation (seismic
block configuration)

• Chamber configuration
• Meetings
• Procedure reviews
• Data handling configuration

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WP2 AMS specific preparation prior to pre-test

• Provision of t/c harness (300 t/c) (no special
  calibration)
• Provision of internal harness including loan of
  vacuum connectors
• Provision of Helium venting line
• Provision of test heater/IR lamp setup (to be
  clarified)
• Support during installation of the compact
  superfluid cooling system around the chamber
• Support during installation of the specimen
  support stand
• Installation of test heater/IR lamp

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WP3 4 days of pre-test

• 4 days of pre-test in VTC modes
• Standard post test activity for facility and data
  handling
• Pre-test facility data report
• Note Pre-test is to check the facility
  configuration including new flanges for line
  feedthrough,
• submit to vacuum all the test aids (test
  support stands, piping, test harness,)

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WP4 Satellite preparation support

• Support to customer during installation of the
  specimen (2 persons/3weeks)
• Verification of specimen instrumentation
• Chamber close-out
• Normally, we have to do our own handling (crane
  operations) of the AMS-02 payload

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WP5 42 days of TB/TV test

• 42 days of TB/TV test including 28 days of TV
  test and 14 days of sun illumination

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WP6 Post-Test Activities

• Support for satellite removal (2 persons/1 week)
• Standard data handling post test activities
  (including 1 set of all data in electronic
  format)
• Standard facility post test activities
• Preparation of facility data report
• Support during specimen support stand

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WP7 General Support

• Preparation of office, check-out area and clean
  room
• 150 sq.m. clean room class 100,000 during 12
  weeks
• (assembly area)
• 30 sq.m. clean room class 100,000 during 12 weeks
• (shipping equipment storage)
• 40 sq.m. clean room class 100,000 during 12 weeks
• (this is requested control room)
• Provision of offices for 15 persons incl. Phones,
  FAX, access to copying machines during 12 weeks
• Cleaning of equipment entering the clean room

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ESTEC meeting outcome

• A new stand for the TV/TB tests will be designed
  and manufactured by AMS Collaboration
• (Shandong University will send a mechanical
  engineer to stay at CERN, who will work on
  designing the stand with Robert Becker)

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ESTEC feedbackAction Items

• 1. AMS Collaboration should try reducing time
  spent inside LSS to 30 days.
• 2. ESTEC will investigate the sensitivity of the
  facility vacuum gauges to the magnetic field
• 3. Thermal model of LSS delivery in the requested
  format (SINDA/TRASYS) will be confirmed end of
  August, 2003
• 4. AMS Collaboration to check how long AMS can be
  disconnected from the vacuum pump

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Status of Action Items fromJuly 3, 2003 Meeting
(1)

• We confirm 30 day thermal vacuum/balance test
  schedule, while recommending reserving 12 days
  contingency, because of the complexity of the
  cryogenic system

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• Simulations have been run in order to estimate
  the time needed for the
• Thermal Cycles
• Thermal Balance
• in HOT and COLD phases

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Preliminary TV-Test schedule 30 days
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Response for Action Item 1

• Geneva, September 18, 2003
• Dear Dr. Zell,
• After discussion of the studies of the times
  needed to obtain stable conditions during thermal
  vacuum
• cycling and thermal balance, we can confirm that
  we request thirty days in the Large Space
  Simulator
• for the thermal vacuum test of the AMS-02
  experiment. This time includes allowance for pump
  down of
• the chamber, cycling to the highest and lowest
  permissible non-operating temperatures, four
  thermal
• cycles to the hottest and coldest operating
  temperatures, hot and cold thermal balance tests,
  followed
• By return to ambient conditions, as shown in the
  accompanying preliminary schedule.
• Following the suggestion of Dr. Eric Ettlinger we
  wish to report to you that you may want to set a
• contingency of the order of twelve days in the
  test time to allow for the possibility of
  unexpected
• difficulties during the test, especially because
  of the complexity of the superconducting magnet
• cryogenic system with 2500 liters of superfluid
  helium.
• With best regards,
• Joseph Burger
• cc Jean Jamar

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Status of Action Items fromJuly 3, 2003 Meeting
(2)

• G. Piret says he has not yet gotten a response
  from manufacturer on ability of LSS vacuum gauges
  to withstand 5 gauss field at walls.
• We offer to make a test in a weak field if ESTEC
  supplies a probe and its electronics.

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Action Item 3

• LSS Geometrical Mathemetical Model and Thermal
  Mathematical Model available only in
  ESATAN/ESARAD (developed by ESA)
• We asked model be translated into SINDA/TRASYS
  (used by NASA and most others)
• We were told this would probably be possible, but
  no answer came
• Now told they will help support the translation.
  Two thermal engineers from SDU are now at CERN
  and will work on this with ESTEC and CGS

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Status of Action Items fromJuly 3, 2003 Meeting
(4)

• S. Harrison confirms cryosystem can remain
  disconnected from vacuum pump at least one day,
  so there is no danger of losing superfluidity in
  case of a crane failure while installing AMS-02
  in the LSS

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Conclusion

• Martin Zell and Wolfgang Supper have stated they
  do not expect any problem for ESA/ESTEC
  supporting the AMS-02 thermal vacuum test
• M. Zell has funds to start support for test
  studies and preparation this year