Generation of microsecond microwave pulses by relativistic electron beams

Experiments on the excitation of microwave radiation have been carried out using a relativistic carcinotron designed for the excitation of the E01 mode of a circular waveguide. Pulses of RF radiation up to 8 microseconds long at a voltage of 160 kV and up to 3 microseconds long at 240 kV have been produced. The respective radiation power levels are 10 and 15 MW. The radiation wavelength is 8.6 cm (at a diode voltage of 160 kV), close to the calculated wavelength, and the width of the output spectrum does not exceed 1.5 percent. The structure and polarization of the output radiation also correspond to the calculated properties for the E01 mode.