The radiation environment in and near high gradient RF cavities

The radiation environment in and near high gradient RF cavities is very important for the instrumentation of the MUCOOL experiment, since large fluxes of X rays and dark current electrons can interfere with the operation of the muon detectors. We have measured the X ray and dark current spectra from a single cell, 1.3 GHz, and are beginning to make more extensive measurements of a multicelled 805 MHz cavity. The results are consistent with electron field emission, bremsstrahlung and photon absorption/scattering. We discuss ways of minimizing this background and the scaling of these results to other cavities.