RF Breakdown of 805 MHz Cavities in Strong Magnetic Fields

Daniel Bowring, Ben Freemire, Andrew Haase, Alexey Kochemirovskiy, Peter Lane, Maria Leonova, Alfred Moretti, Mark Palmer, David Peterson, Diktys Stratakis, Yagmur Torun & Katsuya Yonehara
Ionization cooling of intense muon beams requires the operation of high-gradient, normal-conducting RF structures in the presence of strong magnetic fields. We have measured the breakdown rate in several RF cavities operating at several frequencies. Cavities operating within solenoidal magnetic fields B > 0.25 T show an increased RF breakdown rate at lower gradients compared with similar operation when B = 0 T. Ultimately, this breakdown behavior limits the maximum safe operating gradient of the...
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