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Novel Muon Cooling Channels Using Hydrogen Refrigeration and High Temperature Superconductor | IEEE Conference Publication | IEEE Xplore

Novel Muon Cooling Channels Using Hydrogen Refrigeration and High Temperature Superconductor


Abstract:

Ionization cooling, a method for shrinking the size of a muon beam, requires a low Z energy absorber, high-field magnets, and high gradient RF. We have studied the use of...Show More

Abstract:

Ionization cooling, a method for shrinking the size of a muon beam, requires a low Z energy absorber, high-field magnets, and high gradient RF. We have studied the use of hydrogen systems to provide ionization energy loss for muon beam cooling, breakdown suppression for pressurized high-gradient RF cavities, and refrigeration for superconducting magnets and cold RF cavities. We report progress on the designs of cryostat and refrigeration systems for different sections of muon cooling channels to achieve safe and robust means to enable exceptionally bright muon beams. We find that engineering designs can be greatly simplified if high temperature superconductor can be used that has the capability to carry adequate current in fields above 10 T for temperatures above 33 K for the use of integrated pressurized RF cavities, or for temperatures above 16 K for designs where the RF and cooling sections are sequential.
Date of Conference: 16-20 May 2005
Date Added to IEEE Xplore: 13 February 2006
Print ISBN:0-7803-8859-3

ISSN Information:

Conference Location: Knoxville, TN, USA

INTRODUCTION

The concept of a Helical Cooling Channel (HCC) [1] with a continuous homogeneous absorber has already shown considerable promise to cool the 6D emittance of a muon beam [2]. A recent extension of the HCC concept is to use or momentum-dependent field strengths for new beam cooling applications [3]. Thus, the number of uses of a HCC has increased. Examples of these new applications of a HCC that we have examined so far include: 1) a precooling device to cool a muon beam as it decelerates by energy loss in a continuous, homogeneous absorber, where the cooling can be all transverse, all longitudinal, or any combination; 2) a device similar to the precooler above, but used as MANX [3], a muon cooling demonstration experiment; 3) a transition section between two HCC sections with different dimensions as when the RF frequency can be increased once the beam has been cooled sufficiently to allow smaller and more effective cavities and magnetic coils, and 4) as an alternative to the original HCC filled with pressurized RF cavities. In this case, muons would lose a few hundred MeV/c by ionizing liquid hydrogen in a HCC section with momentum dependent fields and then pass through several RF cavities to replenish the lost energy. This sequence could be repeated several times.

References

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