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Abstract : The international Muon Ionization Cooling Experiment (MICE), site
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d at Rutherford Appleton Laboratory in the UK, aims to build and test one ce
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ll of a a realistic ionization cooling channel lattice. This comprises three
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Absorber-Focus-Coil (AFC) modules and two RF-Coupling-Coil (RFCC) modules.
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Both are technically challenging.
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The Focus Coils are dual-coil superconducting solenoids, in close proximity,
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wound on a common mandrel. Each pair of coils is run in series, but can be
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configured with the coil polarities in the same (solenoid mode) or opposite
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(gradient mode). At the center of each FC there is a 20-L liquid-hydrogen ab
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sorber, operating at about 14 K, to serve as the energy loss medium for the
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ionization cooling process.
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The longitudinal beam momentum is restored in the RFCC modules, each of whic
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h houses four 201.25-MHz RF cavities whose irises are closed with 42-cm diam
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eter thin Be windows. To contain the muon beam, each RFCC module also has a
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1.4-m diameter superconducting coupling solenoid surrounding the cavities. B
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oth types of magnet are cooled with multiple 2-stage cryo-coolers, each deli
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vering 1.5 W of cooling at 4 K.
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Designs for all components are complete and fabrication is under way. Descri
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ptions of
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the various components, design requirements, and construction status will be
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described.
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