0.34THz带状电子注平板格栅返波管数值模拟研究  

Simulation Research on a 0.34 THz Backward Wave Oscillator with Planar Grating and Sheet Electron Beam

作　　者：任泽平 REN Ze-ping(Northwest Institute of Nuclear Technology,Xi'an 710024,China)

机构地区：[1]西北核技术研究院

出　　处：《真空电子技术》2019年第6期50-54,共5页Vacuum Electronics

摘　　要：采用三维粒子模拟软件UNIPIC3D模拟了一种采用带状电子注和平板格栅慢波结构的新型返波管(BWO)。使用平板格栅慢波结构易于加工和成型,带状电子注在横向具有更大的横向尺寸可以降低空间电荷效应引起的电子发散,增强慢波结构中注波互作用,提高输出功率,同时降低对聚焦磁场的要求。数值模拟结果表明,该新型平板BWO能良好的起振,输出电磁波的频率为0.34THz,起振电流只需要200mA,最终模拟得到的稳定输出功率可以达到650mW。模拟还发现使用铜材料时考虑材料表面欧姆损耗后器件的输出功率下降为采用理想导体边界时输出功率的0.36倍。A new backward wave oscillator(BWO)with planar grating slow wave structure and sheet electron beam is simulated using the three dimensional particle in cell code UNIPIC-3D.The planar slow wave structure is easy to manufacture,and the sheet beam with large aspect ratio can reduce the electron divergence caused by space charge effect,enhance the beam wave interaction,increase the output efficiency and reduce the requirement of the focusing magnetic field.The simulation result shows that this BWO can operate with a low beam current of 200 mA and generate 650 mW output power at 0.34 THz.It is also found that the surface ohm loss has an important effect on the working state,and the output power simulated by using copper boundary is much less than that by using PEC boundary.

关 键 词：返波管 平板格栅 带状电子注 粒子模拟 表面阻抗 

分 类 号：O53[理学—等离子体物理]