Resonant reflector of an X-band relativistic backward oscillator

A high power microwave experiment is carried out based on TPG2000 pulse power generator and X-band relativistic backward wave oscillator(RBWO) with a resonant reflector. A microwave with a power of about 2.5 GW and a pulse width of about 20 ns is obtained and the pulse shortening phenomenon is observed, which is caused by resonant reflector breakdown and secondary electron emitting. Chamfering is used to decrease the electric field and restrain the electron emitting on the edge of the resonant reflector. The electric field and reflective parameter varying with chamfered radius is analyzed and corresponding experiments have been conducted. The results indicate that the pulse width increases and the efficiency decreases, with chamfered radius increasing. With a 900 kV, 9 kA electron beam and