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Neutrino Factory/Muon Collider Document 195-v1

A Gaseous Energy Absorber for Ionization Cooling of Muon Beams

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MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
07 Mar 2001, 12:00
Contents Revised:
07 Mar 2001, 12:00
Metadata Revised:
07 Mar 2001, 12:00
Actually Revised:
14 Sep 2006, 13:35
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The case is made for an ionization-cooling channel using low-temperature, high-pressure gaseous hydrogen or helium as a continuous energy absorber. Recent lattice designs with low-beta regions that are continuous along the length of the channel encourage this approach. The gas and the RF cavities can be operated at the same low temperature to improve RF efficiency and to provide gas cooling of the Be windows or tubes of the closed-cell RF cavities. A gaseous absorber should improve ionization-cooling efficiency by eliminating the high-Z walls of the liquid-hydrogen absorbers and perhaps by making the process more adiabatic, with less momentum swing. Other advantages for a gaseous absorber design include 1) a simple way to vary the dE/dx by changing the gas pressure or type for diagnostics or cooling optimization, 2) a possibility of a clear path down the center of the channel for optical or hadron-beam alignment, and 3) reduced radiation backgrounds for beam-diagnostic devices inside the channel. Disadvantages are related to the engineering challenges of RF cavities operating at low temperature and high pressure and to the vacuum window at each end of the channel.
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This is revision # 1
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Rolland Johnson and Daniel M. Kaplan
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