Suppression of Multipactoring in Superconducting Cavities

Future application of superconducting cavities to accelerators for high energy physics will probably require cavities designed for the UHF region. Experience has shown that vacuum electronic phenomena, particularly multipactoring, play an important role in limiting performance of cavities in this frequency domain. We report here work aimed at the suppression of multipactoring by deposition of superficial films on superconducting surfaces.