1 / 15

Report from MICE CC Magnet Cryostat Review

Report from MICE CC Magnet Cryostat Review. Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory MICE Video Conference Thursday , March 15, 2012. CC Cryostat Pre-Production Review. Two days, held on Feb. 29 th and March 1 st at LBNL

josie
Download Presentation

Report from MICE CC Magnet Cryostat Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Report from MICE CC MagnetCryostat Review Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory MICE Video Conference Thursday, March 15, 2012

  2. CC Cryostat Pre-Production Review • Two days, held on Feb. 29th and March 1st at LBNL • Review Committee chaired by Dr. Alan Bross • Committee members: • M. Courthold (RAL), V. Kashikhin (FNAL), A. Nichols (RAL), A. Nobrega (FNAL), H. Tenkate (CERN), J. Weisend (MSU), R. Wells (LBNL) • Participants from MICE, US-MAP, LBNL, FNAL and MIT • Review Charge: To review and comment on • The coupling coil cryostat design; • The overall cooling circuit and overall cryo-design; • Instrumentation plan; • The appropriateness of the planned quench protection system.

  3. CC Cryostat Pre-Production Review • Wednesday, February 29, 2012 • Executive Session • Welcome: Stephen Gourlay (LBNL) • Overview: Alan Bross (FNAL) • Cryostat Design (Overview): Derun Li (LBNL) • Cryostat Mechanical Design Details: Allan DeMello (LBNL) • Cryostat Thermal & Stress Analysis: Heng Pan • Cooling Circuit Design: Steve Virostek (LBNL) • Quench Protection Analysis: Brad Smith (MIT) • Lead Stabilization: AlexyRadovinsky (MIT) • Instrumentation Plan: Steve Virostek (LBNL) • Discussion and Drawing Review • Thursday, March 1, 2012 • Fabrication Plan - China: Nanyang Li (LBNL) • Cold Mass Processing @ LBNL: Allan DeMello (LBNL) • Cold Mass Test Plan: Ruben Carcagno (FNAL) • Cryostattingand Final Test: Stephen Gourlay (LBNL) • Discussion • Review of Action Items • Website: background materials, presentationsand close-out comments • https://conferences.lbl.gov/conferenceDisplay.py?confId=13

  4. General Remarks • Review went well • Strong support from MICE collaboration and MAP management • New committee members outside MAP and MICE collaborations, lots of good questions and suggestions • Cryostat design and drawing package; • Temperature margin and heat load margin; • Cooling circuit; • Instrumentation plan; • First cold-mass testing at Fermilab. • Lots of work ahead • Final report will be available by end of March, 2012 • Findings; • Comments; • Recommendations.

  5. Key Review Comments • Temperature margin • 0.6 K is too small for 240 MeV/c; • Superconductor to Cu ratio? More turns? • Cooling circuit • Good; • A full scale testing before final cryostating would be prudent; • Adding a He gas make-up line; • Three cryocoolers should work (based on updated heat load calculations by SV). • Cryostat design • Drawing package is not ready for outside fabrication yet; • Further reviews by LBNL engineers, technicians and machine shop • Assessment of cryostat support due to force of the shielding wall at MICE hall • Instrumentation • Okay

  6. Key Review Comments (cont’d) • Quench Protection • Consider to add heaters to the bobbin; • Decide how many sub-divisions for sequent MICE CC magnets; • Lead stabilizations; • Cold-diodes testing in B field and low temperature • First cold-mass testing at Fermilab • Interface documents; • Responsibilities of LBNL and Fermilab; • Update cool-down analysis (LBNL); • Testing plan (LBNL). • Consider possibility of testing the cold-mass in vertical orientation. • 2nd and 3rd coiling winding • Start winding after the first cold-mass testing

  7. Progress after the Review • Quench protection and lead stabilization • AD and SV visited MIT (March 12-14) to work on the detailed engineering/mechanical design of the quench circuit and lead stabilization • Updated cool-down analysis (5 g/s) at LBNL • Updating cryostat drawings at LBNL • Cold diodes testing in progress at LBNL • Completed preliminary review and cost estimate of the CC cryostat fabrication and assembly at LBNL • Progress of the first cold-mass testing at Fermilab • Interface documents • Presentation by Ruben (this meeting)

  8. CLOSING REMARKS

  9. Following the Review ChargeCryo-Design • Review and comment on the overall cooling circuit and overall cryo-design. • Temperature Margin • For the 240 MeV/c MICE operating configuration, the temp. margin (even in the nominal case) is too small (0.6K) and the likelihood for successful operation of the magnet is small • For the other MICE configurations the T margin is sufficient • The nominal temperature margin will REQUIRE the utmost care during planning, parts fabrication and assembly. • Re-access the peak T in the coil under all operation conditions • Cooling Cirucuit • Looks OK • A full-scale test (prior to assembling the final CCM) would be very prudent. • In Fermilab Solenoid Test Facility? • Control Heater • Should be mounted in top reservoir. • Re-evaluate need for the 3 parallel circuits • Amend Heat Load analysis to include heat due to charging, heater leads and liquid level probe leads • Revised numbers give us sense that 3 CCs will work • Update PID for the cooling circuit and show all outside connections • Add He gas make-up line. Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  10. Cryo-design • Shield • Validate that the single electrical circuit break on the thermal shield is adequate • We recommend the use of bumpers between 60K and 4K • Check MLI specification (both shield and cold-mass. • Vent Line • Redesign line to eliminate the unconstrained bellows Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  11. Cryostat Design • Review and comment on the Coupling Coil cryostat design in the following areas: • Validity of the overall design • Make sure that documentation is available to allow operation under appropriate UK codes. • Verify analysis of pressure safety of the He circuit and the vacuum vessel • Establish allowable stress criteria and document it. • Revisit the stress analysis of the cold-mass supports • Is the package suitable for outside fabrication • NO • Weldment assembly drawings detailed are not sufficient • Piece-part drawings are missing adequate tolerance (on the part & how individual parts are put into assemblies – tolerance stack-up). • Piece-part dimensions do not account for post machining steps • QA Procedures need to be improved • Travelers • Discrepancy reports & how it is mitigated? • Full-time US presence in China during parts fabrication is Highly Advisable (QC monitor) • Does the cryostat support all expected loads? • Magnetic forces due to Fe walls in the MICE hall have not been evaluated Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  12. Instrumentation Plan • Review and comment on the instrumentation plan • Looks OK from information presented. • Consider moving expansion joint on the cold end of the LL probe • Consider reducing the # of T sensors on the shield for later magnets • Consider adding a heater on the coil mandrel • For test • Add redundant level control heater Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  13. Quench Protection • Review and comment on the appropriateness of the planned quench protection system • Consider adding heaters to the bobbin to allow for active QP if needed • Needed for the test program in any event. • Bring to a conclusion as soon as possible the # of segments. Conservatism here is advised – go for the lowest possible voltage • Establish the Peak pressure in the He system during quench • Lead and bus protection is of paramount importance & should continue to be evaluated. • Cold diode assembly(ies)/module (as-built) needs to be tested in proper T and B environment(s). • Define system needed to protect magnet during power failure • Fast discharge? • Re-evaluate cold-mass thermo-mechanical stresses and deformations during the quench. • LTS leads and loops MUST be stabilized sufficiently. These areas need to be treated with extreme conservatism. Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  14. Note on Testing & Other • The test plan, documentation, detailed procedures, mechanical orientation need to be precisely defined. • Consider testing winding in vertical orientation • Having results from tests on first coil before starting the wind the second, is recommended • Re-evaluate the SC/Cu ration in the new SC order and its impact on magnet performance and operation. • Do not HTS leads in the Fermilab STF Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

  15. Final Report • Follow format as before: • Findings • Comments • Recommendations • Asked for input from the committee within 2 weeks • The hope to have final edit in 1-2 weeks afterwards Alan Bross MICE CCM Pre-production review 2/29-3/1, 2012

More Related