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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 DCsolenoid magnets. Under these conditions, cavities exhibit increasedsusceptibility to RF breakdown, which can damage channel components and imposeslimits on channel length and transmission efficiency. We present a solution tothe problem of breakdown in strong magnetic fields. We report, for the firsttime, stable high-vacuum, copper cavity operation at gradients above 50 MV/mand in an external magnetic field of three tesla. This eliminates a significanttechnical risk that has previously been inherent in ionization cooling channeldesigns.

Operation of normal-conducting RF cavities in multi-tesla magnetic fields for muon ionization cooling: a feasibility demonstration