NFMCC Meeting 3/12/06 A. Bross LiH Absorbers Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross.
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NFMCC Meeting 3/12/06 A. Bross LiH Absorbers Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross
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NFMCC Meeting 3/12/06 A. Bross LiH Absorbers LiH is an interesting absorber material to study u Figure of merit is relative good u Safety concerns are much less of an issue when compared to LH 2 s Water is obviously an issue u Potentially Much cheaper than LH 2 Need to understand u Stability under intense radiation u Detailed knowledge of thermal characteristics s Heat conduction, Thermal expansion, etc. –Allows for precise calculations –Determines how to cool s Depends critically on production technique for producing the LiH disks u Fabrication Techniques s Encapsulation very likely required s Cooling
Transcript of NFMCC Meeting 3/12/06 A. Bross LiH Absorbers Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross.
NFMCC Meeting 3/12/06A. Bross
LiH Absorbers
Muon Cooling R&DNFMCC MeetingMarch 12, 2006
A. Bross
NFMCC Meeting 3/12/06A. Bross
2D Transverse Cooling
and
Figure of merit: M=LRdE/dsM2 (4D cooling) for different absorbers
Absorber Design Issues
Absorber Accelerator Momentum loss is opposite to motion, p, p x , p y , E decrease
Momentum gain is purely longitudinal
Large emittance
Small emittance
H2 is clearly Best -Neglecting Engineering
Issues Windows, Safety
NFMCC Meeting 3/12/06A. Bross
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
NFMCC Meeting 3/12/06A. Bross
LiH Heating
NFMCC Meeting 3/12/06A. Bross
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 involvedthan these 3 bullets mightindicate.
NFMCC Meeting 3/12/06A. Bross
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
NFMCC Meeting 3/12/06A. Bross
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
