.3 Mm Band Numerical Simulation And Design Of Single-cavity Cyclotron Oscillator

The High Power Microwave (HPM) technology as a combination of pulse power technology, plasma physics and vacuum electron device is a rising science in the 1970s. The demands from military and industry urged this new science to develop dramatically. The gyrotron, as a kind of fast-wave vacuum electron device based on electron cyclotron maser instability, can generate high pulse power and continuous power by diverse ways at a wide frequency scope. The numerous and significant applications in accelerator, plasma heating, radar, microwave weapon, communication and electron rivalry has lead to much respect in the world.In the later of 1970's, Prof. Liu Shenggang started the research on electron cyclotron maser which is the first step of domestic research in this field. Later, a plenty of researchers leaded by Prof. Li Hongfu have done much research work on gyrotron and successfully developed a first Ka band third harmonic gyrotron oscillator with a permanent magnet system in 2001. Besides lots of development on the 8mm band gyrotron, many scientists in the world have focused on the research of the 3mm band gyrotron. As atmospheric window, the 3mm gyrotron has its own advantages, and has been applied in many areas such as radar, microwave arms, plasma heating and so on. However, domestic research on 3mm band gyrotron is not plentiful. The paper designed a 3mm band gyrotron oscillator based on the theory of electron cyclotron maser, and made a significant promotion on output power by optimizing parameters related to the gyrotron by PIC. All this work could provide reliable data for experiments on 3mm band gyrotron in future.The main works of this paper are listed as following:According to linear theory of gyrotron, the starting current and working magnetic field has been carried out to suppress competition mode; The coupling coefficient has been carried out to get electron guiding centre radius; Finally the cavity geometry parameters have been calculated initially.With the help of PIC software, MAGIC, the initial parameters have been verified, and the influences, the parameters brought to output power and interaction efficiency have been observed though a mass of PIC work. At the end, the optimize parameters have been listed.