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Article
Title	Progress on the MICE Liquid Absorber Cooling and Cryogenic Distribution System
Author(s)	Green, Michael ; Baynham, D Elwyn ; Bradshaw, Thomas W ; Cummings, M A C ; Drumm, Paul V ; Ishimoto, Shigeru ; Ivanyushenkov, Yury ; Lau, Wing ; Yang, Stephanie
Affiliation	(CCLRC/RAL, Chilton, Didcot, Oxon) ; (KEK, Ibaraki) ; (LBNL, Berkeley) ; (Northern Illinois University, DeKalb, Illinois) ; (OXFORDphysics, Oxford, Oxon)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1601
Subject category	Accelerators and Storage Rings
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. Because the muon beam in MICE is of low intensity, there is no beam heating in the absorber. As a result, the absorber can be cooled using a single 4 K cooler. This report describes progress on the MICE liquid absorber and its cryogenic cooling system.