基于SDRWS的340 GHz返波管的计算机模拟

采用计算机模拟的方法对一种基于双排矩形波导慢波结构(SDRWS)的340 GHz返波管进行详细研究。首先对返波管所需的电子枪和永磁聚焦系统进行计算机模拟，结果表明，永磁聚焦系统与电子枪相结合，能够产生并维持14~17 kV，43.4 mA的电子注和18~21 kV，56.1 mA的电子注，且电子注电压在14~21 kV之间时，电子注在慢波结构区域的最大半径小于0.08 mm，半径波动最大值为0.034 mm。利用所计算的电子注，对基于SDRWS的340 GHz返波管进行互作用计算，结果表明，当电子注电压在14~21 kV之间调谐时，输出电磁波在326~352.6 GHz之间，输出功率大于2 W。同时，SDRWS的电子注通道半径为0.09 mm，相对较大，降低了返波管的制造难度。

Computer simulation of a 340 GHz backward wave tube based on SDRWS

A 340 GHz Backward Wave Tube(BWT) based on Staggered Double Rectangular Waveguide Structure(SDRWS) is studied in detail by computer simulation. Firstly, an electron gun and a permanent magnet focus system are calculated, the results shows that beams with 14 kV-17 kV of voltage, 43.4 mA of current and 18-21 kV of voltage, 56.1 mA of current are produced and maintained, the maximum radius of the beam is smaller than 0.08 mm, and the maximum radius variance of the beam reaches 0.034 mm. Secondly, combining those beams with SDRWS, the interaction in the BWT based on SDRWS is calculated, the results shows that the working frequencies of the BWT cover 326-352.6 GHz when the beam voltage is tuned within 14-21 kV and the output powers of the BWT are larger than 2 W. In the simulations, the radius of the SDRWS is set to be a relatively big value of 0.09 mm, signifying that the manufacturing of the BWT is relatively easy.