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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, July 23

AMS-02 Thermal Vacuum and Thermal Balance Tests in the Large Space Simulator at ESTEC J. Burger AMS-02 TIM CERN, July 23, 2004 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

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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, July 23

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

  2. 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

  3. 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

  4. Large Space Simulator DimensionsUseable Volume: diameter 9.5m, height 10m

  5. 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

  6. 90 ton seismic block can support 60 tonsexternal dimensions 3.2m x 3.2 mmechanically decoupled from LSS and building

  7. Example of mounting HST Solar Wing on block

  8. Vacuum system typical pumping times

  9. 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

  10. 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

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

  12. 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

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

  14. 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

  15. 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,…)

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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)

  21. 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

  22. 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

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

  24. Preliminary TV-Test schedule: 30 days

  25. 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

  26. 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.

  27. 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

  28. 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

  29. 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

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