Abstract submitted to
the
2005 Particle
Accelerator Conference
16th to 20th May 2005, Knoxville,
Tennessee, USA
PAC05: Abstract number
2538.
Progress on the Liquid Hydrogen Absorber for the MICE
Cooling Channel
M. Green, E. Baynham, T.
Bradshaw, M. Cummings, S. Ishimoto, Y. Ivanyushenkov, W. Lau, S. Yang
for
the
MICE Collaboration
Abstract
This report describes the progress made on the design of the
liquid hydrogen absorber for the international Muon Ionization Cooling
Experiment (MICE). The absorber consists of a 21-liter vessel
that contains liquid hydrogen (1.5 kg) or liquid helium (2.63 kg). The cryogen vessel is within the warm bore of
the superconducting focusing magnet for the MICE. The purpose of the magnet is to provide a low
beam beta region within the absorber.
For safety reasons, the vacuum vessel for the hydrogen absorber is
separated from the vacuum vessel for the superconducting magnet and the vacuum
that surrounds the RF cavities or the detector.
The absorber has two 300 mm-diameter thin aluminum windows. The vacuum
vessel around the absorber has a pair of thin aluminum windows that separate
the absorber vacuum space from adjacent vacuum spaces. The absorber will be
cooled down using a heat exchanger that is built into the absorber walls. Liquid nitrogen is used to cool the absorber
to 80 K. Liquid helium completes the
absorber cool down and condenses hydrogen in the absorber. The absorber may also be filled with liquid
helium to measure muon cooling in helium.