Abstract
Ionization cooling is the preferred method for producing bright muon beams. This cooling technique requires the operation of normal conducting, radio-frequency (RF) accelerating cavities within the multi-tesla fields of DC solenoid magnets. Under these conditions, cavities exhibit increased susceptibility to RF breakdown, which can damage channel components and imposes limits on channel length and transmission efficiency. We present a solution to the problem of breakdown in strong magnetic fields. We report, for the first time, stable high-vacuum, copper cavity operation at gradients above 50 MV/m and in an external magnetic field of three tesla. This eliminates a significant technical risk that has previously been inherent in ionization cooling channel designs.
Highlights
Scenarios for collisions of high-energy muons and the storage of muons as a neutrino beam source have been developed [1,2,3,4]
After establishing the stable operating gradient (SOG) for beryllium in three tesla, a wide range of the parameter space was sampled with beryllium endplates at lower statistics
These results demonstrate the feasibility of muon ionization cooling channels that rely on evacuated rf cavities operating at gradients of tens of MV/m in multi-tesla external magnetic fields
Summary
Scenarios for collisions of high-energy muons and the storage of muons as a neutrino beam source have been developed [1,2,3,4]. Muon ionization cooling has recently been demonstrated for the first time [8]. A muon ionization cooling channel consists of strongfocusing magnets inducing high beam divergence within low-density, energy-absorbing media, and radio-frequency (rf) accelerating cavities to recover the longitudinal momentum lost by muons traversing the absorbing media. Strong magnetic fields overlap high-gradient rf accelerating cavities. The International Design Study for a future Neutrino Factory used 12–15 MV=m, 201 MHz rf cavities within two-tesla magnetic fields in its baseline design [2]. Some muon collider designs call for cooling
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