Research Of Space-time Characteristic And Simulation In Typical High Power Microwave Devices

High power microwave source is an important part in the high power microwave system. It can launch high power microwave with absorbing energy of relativistic electron beam. This paper studied the characteristic of space-time chaotic in traveling wave tube and magnetically insulated transmission line oscillators, which were two typical devices of high power microwave source, discussed the nonlinear effect between electron beam and radiation field, and competed design and simulation of magnetically insulated transmission line oscillator’s model.On the basis of the nonlinear equations which describe the evolution of traveling wave tube and magnetically insulated transmission line oscillator’s radiation field, the characteristic of chaotic dynamics was investigated. The temporal evolution of the output power, the phase space of the electron orbits, the time-space distribution amplitude of the radiation field were studied numerically. The result shows:the systems of the radiation field and the electron beam are dissipative in traveling wave tube and magnetically insulated transmission line oscillator; when beam current that can directly influence the behavior of the systems’evolution above a certain threshold, chaotic characteristic is appeared in the whole time and space of the system; in magnetically insulated transmission line oscillator, there are features as rotation of "spokes" current and phase-shift, which make radiation field appear chaotic easier than radiation field in traveling wave tube.A S-band magnetically insulated transmission line oscillator (MILO) was designed. Different from regular tapered MILO, It uses the slow-wave structure which is usual used in load-limited MILO. Then the S-band MILO was simulated by3D fully electromagnetic particle simulation soft. The result shows:it obtains a high power microwave, of which average output power is from2.3GW up to2.7GW, the efficiency is from7.1%up to8.2%, the peak power is from4.0GW up to5.2GW, the frequency is3.5GHz. It shows that the performance of the MILO has been improved.