Design of W-band Relativistic Surface-Wave Oscillator with Sheet Electron Beam

Relativistic surface-wave oscillator driven by 600 kV, 1 kA sheet electron beam is designed and preliminary experiments were carried out. 2-D simulations based both on quasi-optical theory and on the PIC code predict that the device can operate at the π-mode of the rectangular grating providing the output power of up to 70-100 MW at the frequency of 75 GHz. In the initial experiments, a thin sheet electron beam was injected from a blade-shaped explosive cathode and guided very close to the rectangular corrugation resulting the 80-GHz radiation pulses with 3 ns duration.