Observation of the Second Mode of the Multipactor Discharge in Crossed Fields

We detect the second discharge mode in the process of experimental studies of a one-sided multipactor discharge in crossed fields (microwave electric field and magnetostatic field) in the three-centimeter wavelength band in a rectangular waveguide and a cylindrical resonator cavity. In accordance with the theory, the intensity of the discharge at the second mode was slightly lower than that at the fundamental mode. However, it is still sufficient for initiation of microwave breakdowns, absorption of a significant fraction of the radiation power, and modification of the resonance frequency of the cavity.