基于CST的W波段回旋振荡管的三维仿真

3D Simulation of W Band Gyrotron with CST

W波段回旋振荡管是一种重要的高功率毫米波源,对其注波互作用进行仿真,可以有效地提高制管效率,降低研发周期与成本。本文以W波段TE02模回旋振荡管为例,利用CST粒子工作室对其注波互作用过程进行了三维仿真。仿真结果表明,在工作电压50kV,工作电流9A的条件下,激励起了所需的工作模式,获得了92kW的输出功率,效率为21%,所得谐振频率与设计频率的偏差值为0.3GHz。该结果与Magic的仿真结果基本一致,这进一步验证了所设计高频谐振腔的可行性。同时,基于CST的三维仿真给出了直观的注波互作用过程,并展示了寄生模式的功率演变情况,这为后续提升谐振腔性能的改进工作提供了依据。

W-band Gyrotron is an important source of high power millimeter wave. The simulation of beam wave interaction has a significant influence on improving the efficiency of research and development, which is useful for saving the cost. In this paper, a 3D simulation of W band gyrotron has been carried out with the CST PIC studio. The simulation results indicate that in the condition of 50 kV and 9A, the desired operating mode has been excited, and an output power of 92 kW and an efficiency of 21% have been obtained. The difference between the resonant frequency and the design value is 0.3GHz. The above results agree well with the simulation results achieved by Magic code;the feasibility of the design of the resonant cavity has been further verified. Meanwhile, the 3D simulation with CST reveals an intuitive process of the beam-wave interaction, and the evolution processes of the power of the parasitic modes have also been presented, which is helpful to improve the performance of the resonant cavity.