Title:

 Progress in the construction of the MICE cooling channel

Abstract:

 The international Muon Ionization Cooling Experiment (MICE), sited

at Rutherford Appleton Laboratory in the UK, aims to build and test

one cell of a realistic ionization cooling channel lattice. This

comprises three Absorber Focus Coils (AFC) modules and two RF Coupling

Coil (RFCC) modules; both are technically challenging. The Focus Coils

(FC) are dual-coil superconducting solenoids, in close proximity,

wound on a common mandrel. At the center of each FC there is a 20

letters liquid-hydrogen absorber, operating at about 14 K, to serve as

the energy loss medium for the ionization cooling process. The

longitudinal beam momentum is restored in the RFCC modules, each of

which houses four 201.25-MHz RF cavities whose irises are closed with

42-cm diameter thin Beryllium windows. To contain the muon beam, each

RFCC module also has a 1.4-m diameter superconducting coupling

solenoid surrounding the cavities. Both types of magnet are cooled

with multiple 2-stage cryogenic-coolers, each delivering 1.5 W of

cooling at 4 K. Designs for all components are complete and

fabrication is under way. Descriptions of the various components,

design requirements, and construction status is presented.