Mutual Coupling Relativistic Backward Wave Tube Equivalent Phase Lock Particle Simulation

Relativistic backward wave oscillator is the first successful development of the high power microwave source, but the research of its phase-locking have had been not very much.Study of phase-locking phenomena in high power oscillators have been focused on magnetron since the seventies of last century. There are many differences in operation principle between backward wave oscillator and magnetron, so the phase-locked difficulties of these two oscillators are very different.This article provides an overview of the research situation about high power microwave source and its phase locked technique, introduces electromagnetic particle simulation software Chipic developed by University of Electronic Science and Technology of China,and then a relativistic backward wave oscillator with GW output power is designed by this software, output power is stable under3.3T guide magnetic field and the frequency range approximately is between9.4170GHz and9.5835GHz through electronic tuning.From theroy about injection locking and peer-to-peer locking of relativistic magnetron peer-to-peer locking theory of relativistic backward wave oscillator is given in this article. A great deal of electromagnetic particle simulation have been carried out, the results show that:(1) Two relativistic backward wave oscillators with identical physical structure are connected in paralle through a slit waveguide, then different acceleration voltage drive them in the electronic tunable range,peer-to-peer locking is achieved in the two relativistic backward wave oscillators;(2) With several exceptions common frequency lies between the two RBWOs’ free running frequencies in most cases;(3) Common frequency will lower than any one of the two relativistic backward wave oscillators if the same acceleration voltage drive them;(4) Energy convertion of efficiencies of the two relativistic backward wave oscillators are improved to varying degrees after peer-to-peer phase locked, output power increase of one with lower accelerating voltage is more significant, the increase of total output power is more than11%under different accelerating voltages;(5)The increase of total output power when the same acceleration voltage drives the two relativistic backward wave oscillators in the electronic tunable range is the highest single, relatively independent working state, and it is able to exceed15%relative to work alone(calculation of the relative growth rate is that the percentage of the absolute increase of the total output power to the the total output power under working alone);(6) Peer-to-peer phase locking of the two relativistic backward wave oscillators can efficiently inhibit unstability of work status in some casen,and enable the output microwave more stable, frequency more pure.