A New High Power Microwave Source Operated at Low Magnetic Field

Abstract

A new type of high power microwave source operated at low magnetic field is proposed and studied by the particle-in-cell (PIC) method. An oversized uniform backward-wave-oscillator-like structure is connected to a tapered slow-wave structure by a resonant cavity. In this device, the electron beam current is effectively used to yield microwaves with high efficiency, and the mode is locked in a wide range of diode voltage to reduce the requirement to the voltage wave form. The PIC simulation results show that a peak microwave power of 2.1 GW (averaged 1.1 GW) with a pure TM01 mode at 10.7 GHz is radiated with 4.1 GW input beam power, the frequency remains approximately the same when the diode voltage changed from 300 kV to 700 kV.