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AMS-02 Thermal Vacuum and Thermal Balance Tests in the Large Space Simulator at ESTEC J. Burger AMS-02 TIM CERN, Oct. 2

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AMS-02 Thermal Vacuum and Thermal Balance Tests in the Large Space Simulator at ESTEC J. Burger AMS-02 TIM CERN, Oct. 2

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    1. AMS-02 Thermal Vacuum and Thermal Balance Tests in the Large Space Simulator at ESTEC J. Burger AMS-02 TIM CERN, Oct. 2003

    2. AMS data sheet Size = 3.2 m x 5.1 m x 4.1 m [in test stand] Mass = 6700 Kg [8944 Kg test article] [10817 Kg crane wt.] Power = 2kW

    3. Two Meetings at ESA/ESTEC Noordwijk, Netherlands to request overall AMS-02 TVT in 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

    4. LMSO Visit to LSS Trent Martin, Phil Mott, Ross Harold, and Craig Clark were at ESTEC Friday for planning acoustic test. Also visited the Large Space Simulator

    6. Large Space Simulator Dimensions Useable Volume: diameter 9.5m, height 10m

    7.

    8. 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, net 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

    13. 90 ton seismic block can support 60 tons external dimensions 3.2m x 3.2 m mechanically decoupled from LSS and building

    14. Example of mounting HST Solar Wing on block

    15. Vacuum system typical pumping times

    16. 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 won’t work on He Vent lines are needed for normal He and TRD gas venting and venting from the cryosystem burst disk outputs

    17. Shrouds and Nitrogen Supply C1 covering the main chamber LN2 mode (<100K)(max. heat load 170kW) or GN2 mode (150-350K) (max. heat load 10kW) C2 covering the auxiliary chamber – LN2 mode only

    18. Solar Simulator Horizontal beam 6m diameter, 5m deep Maximum intensity at nominal lamp power 2000W/square meter Intensity distribution in reference plane within +/-4%

    19. 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

    20. WP1 – Standard Facility preparation (seismic block configuration) Chamber configuration Meetings Procedure reviews Data handling configuration

    21. 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

    22. 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,…)

    23. 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

    24. 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

    25. WP6: Post-Test Activities Support for sattelite 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

    26. 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

    27. ESTEC meeting outcome A new stand for the TV/TB tests will be designed and manufactured by AMS Collaboration

    28. ESTEC feedback Action 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 4. AMS Collaboration to check how long AMS can be disconnected from the vacuum pump

    29. Status of Action Items from July 3 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

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

    31. Preliminary TV-Test schedule: 30 days

    32. 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 Gaetan Piret S. C. C. Ting

    33. Status of Action Items from July 3 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.

    34. Action Item 3 LSS GMM and TMM 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 that an answer would be give by the end of August No answer came – heard informally that it would not be possible

    35. Action Item 3 (cont.) Last week M. Molina was at a thermal workshop at ESTEC and presented CGS activities, including work on how to do such a model translation Wolfgang Supper (head of ESA/ESTEC thermal) will take this up with thermal software group This development would be an advantage to ESA/ESTEC in attracting more users (most of which use SINDA/TRASYS) for the LSS

    36. Status of Action Items from July 3 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

    37. Conclusion Martin Zell and Wolfgang Supper have stated they do not expect any problem for ESA/ESTEC supporting the AMS-02 thermal vacuum test

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