相对论磁控管透明阴极的仿真与实验
Simulation and experiment on transparent cathode for relativistic magnetron
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摘要: 基于一个6腔异腔结构相对论磁控管，运用粒子模拟仿真软件，对同轴阴极和透明阴极的特性进行仿真和实验研究。经仿真优化，设计并制作了一支3个带的透明阴极。粒子模拟结果表明，在相同条件下透明阴极比同轴阴极电子群聚时间大大缩短，起振时间大幅减小，整管效率提高约1倍，输出微波频谱更纯，模式竞争更小。实验结果表明，相同条件下，应用透明阴极所得到的微波脉宽较宽，在S波段获得721 MW的微波功率输出。说明应用透明阴极能缩短相对论磁控管起振时间，与粒子模拟结果相符。Abstract: Based on a relativistic magnetron(RM) which has six different cavities, a three-strip transparent cathode has been designed and fabricated to improve the output characteristics of the RM. Computer simulation and laboratory tests are used to compare outputs of RMs using coaxial cathode and transparent cathode, respectively. The computer simulation shows that the RM using transparent cathode has less electron bunching time, less start up time, higher efficiency, better optimized output spectrum and less mode competition. The laboratory tests show that the RM using transparent cathode obtains wider pulses in the same conditions of experiment. The result indicates that using transparent cathode can shorten the start up time of RM, which agrees with the computer simulation. Moreover, the experi
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Key words:
- relativistic magnetron /
- transparent cathode /
- finite difference /
- π-mode
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