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LiH Absorbers

LiH Absorbers. Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross. Absorber Design Issues. 2D Transverse Cooling and Figure of merit: M=L R dE m /ds M 2 (4D cooling) for different absorbers. H 2 is clearly Best - Neglecting Engineering Issues Windows, Safety. LiH Absorbers.

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LiH Absorbers

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  1. LiH Absorbers Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross

  2. Absorber Design Issues • 2D Transverse Cooling and • Figure of merit: M=LRdEm/ds M2 (4D cooling) for different absorbers H2 is clearly Best - Neglecting Engineering Issues Windows, Safety

  3. LiH Absorbers • LiH is an interesting absorber material to study • Figure of merit is relative good • Safety concerns are much less of an issue when compared to LH2 • Water is obviously an issue • Potentially Much cheaper than LH2 • Need to understand • Stability under intense radiation • Detailed knowledge of thermal characteristics • Heat conduction, Thermal expansion, etc. • Allows for precise calculations • Determines how to cool • Depends critically on production technique for producing the LiH disks • Fabrication Techniques • Encapsulation very likely required • Cooling

  4. LiH Heating

  5. Test Program • Produce encapsulating cast (not pressed) samples • Small disk (5-10 cm) for intense radiation exposure • At Fermilab Radiation Test Facility • Look at Material stability primarily • Temperature Profile • Large disk (30 cm) for detailed thermal conductivity studies • External Cooling + Internal Heating • Potential absorber for MICE Phase I • Non-instrumented, no cooling This will be far more involved than these 3 bullets might indicate.

  6. Engineering Concept • SS ring with brazed cooling tubes • Encapsulated with thin SS windows • 5-10 micron • Instrumentation ports • Hermetic connectors • Temp sensors • Heater power • Gas pressure port • For decomposition under intense rad studies • Cast LiH with sensors • Encapsulate via e-beam welding of thin windows

  7. Plan for this year • No detailed engineering has been done at present • Will request support from PPD ME department • Evaluate instrumentation • Temperature sensors • Heaters • Discuss with ORNL the possibilities for fab • Casting • Encapsulation • e-beam welding? • Progress will depend on resources • Manpower is very limited at this time • Fraction of Don Summers and myself • Help will be graciously accepted • M&S - <$20k

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