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MICE Updates

MICE Updates. Target. BM2. BM1. Decay Solenoid. MICE Hall Target Decay Solenoid Trackers Spectrometer Update Schedule. Terry Hart, NFMCC Friday Meeting, May 15, 2009. Details at www.mice.iit.edu/vc/vc118/vc118.html , www.mice.iit.edu/vc/vc119/vc119.html ,

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MICE Updates

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  1. MICE Updates Target BM2 BM1 Decay Solenoid • MICE Hall • Target • Decay Solenoid • Trackers • Spectrometer Update • Schedule Terry Hart, NFMCC Friday Meeting, May 15, 2009 Details at www.mice.iit.edu/vc/vc118/vc118.html, www.mice.iit.edu/vc/vc119/vc119.html, www.mice.iit.edu/vc/vc120/vc120.html TLH, NFMCC Friday Meeting

  2. MICE Beamline Target BM2 BM1 Decay Solenoid Target: Titanium paddle dipped into ISIS proton beam to produce pions Decay Solenoid: Focuses muon beam coming from pion decay TLH, NFMCC Friday Meeting

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  6. Installation & Commissioning Schedule (Draft! To be discussed tomorrow [May 8]!) Early August (1 week): Assemble Target1: Core (stator), shaft, optics, bellows in clean area at RAL. Install in R78. Add optical, electrical, water connections. Run for ≤ 1 week (How many pulses??) Infrastructure planning – finalise tomorrow [May 8]. In parallel, assemble Target2. Install Target2 in R78. Run as demonstrator. Transfer Target1 to ISIS, install in August shutdown. Chris Booth University of Sheffield TLH, NFMCC Friday Meeting 6

  7. MICE Beamline Target BM2 BM1 Decay Solenoid Target: Titanium paddle dipped into ISIS proton beam to produce pions Decay Solenoid: Focuses muon beam coming from pion decay TLH, NFMCC Friday Meeting

  8. Decay Solenoid (DS) • Lack of multi-layer insulation (MLI) determined to be cause of quenches about 290 A (normal running at 890 A) • MLI added to exit end of DS. • Add MLI to entry end of DS during ISIS shutdown • Other tasks • Investigate quench detector issues • Attempt to fix transfer line leak TLH, NFMCC Friday Meeting

  9. Decay Solenoid Decay Solenoid – Powered up to 900 A, 24/04/09 • Between 21-23 April: • Quench Detector (QD) problem diagnosed to broken wire within QD chassis • 2A fuse associated with QD external relay chain blew and replaced with 5A fuse (need to restore original fuse tolerance) • Fri 24 April: • Decay Solenoid powered up in stages to 900 A • Then brought down to 870 A (5T B-field), where it remained for 1 hour • Powered down once more. • Further tests need to be carried out • Need to carry out soak tests at 870 A over a period of many days to demonstrate that solenoid can work in a stable manner • Tom Bradshaw putting together document to define standard operating conditions for decay solenoid. Many thanks to Matt Hills, Jim Rochford, Mike Courthold, Craig Macwaters, James Leaver, Willie Spensley, Linda Coney … TLH, NFMCC Friday Meeting

  10. Tracker 2 Readout • Tracker 2 readout boards tested and characterized at FNAL • Tracker 2 readout system shipped to RAL • Tracker 2 assembled at RAL • Power failure prevented tracker 2 cosmic ray tests (joining tracker 1) TLH, NFMCC Friday Meeting

  11. Trackers • 2 trackers currently in Lab 7 • Optimum bias voltages set for all 8 cassettes • Final LED data taking starts today TLH, NFMCC Friday Meeting

  12. Spectrometer Update • “Second magnet” to be shipped to FNAL for field mapping before “first magnet” • Field mapping progress • Developed by IIT student Ben Freemire with help from Yagmur Torun and Rajendra Raja • Software can plot field components at specified locations • User interface functionality determined and finished • Differences in field values of test magnet using Senis and NIKHEF probes TLH, NFMCC Friday Meeting

  13. Field Plots from Senis and NIKHEF Probes • Top: NIKHEF • Asymmetric along y-z • Max. field different than for Senis • Not flat at min., max fields • Explanation • Magnet bumped? • Manipulator skewing positions? • Bottom: Senis • Field shape and values good • Remap magnet TLH, NFMCC Friday Meeting

  14. Summary [from May 7 videoconference] • Second magnet assembly including all fixes and modifications has been completed • Second magnet had been cooled to 5K (cold mass) and transfer of LHe was under way • An internal leak developed between the cryostat and the insulating vacuum (1 week ago) • Leak is likely in either the cryostat fill or vent lines • Magnet has been warmed up and leak checking is under way • LN cooldown system developed at FNAL has been installed • Temperature logging system developed at LBNL is working • First magnet completely disassembled, fixes well under way in preparation for reassembly • Additional cryostat penetrations and extra vent line added • Modifications to vent line are nearly complete TLH, NFMCC Friday Meeting

  15. Current Spectrometer Considerations • Time estimate for shipment to FNAL now impossible to make • FNAL shutdown starts June 15 • Doubtful magnet can be mapped before August • Discussion at next MICE meeting about possibly moving tracker w/o magnet to MICE hall TLH, NFMCC Friday Meeting

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