3 mm波段二次谐波渐变复合腔回旋管的非线性模拟

 利用含电流的传输线方程，并在考虑多模注-波互作用及多模耦合的情况下，利用自主开发的多模高次谐波渐变结构复合腔回旋管的注-波互作用数值模拟软件，对3 mm波段二次谐波渐变复合腔回旋管进行了自洽非线性模拟，分析了H₀₂-H₀₃模式对下磁场系数、电流、电子注速度比对注-波互作用效率的影响。计算结果表明，在合适的腔体结构尺寸下，以及合适的磁场系数、电流、速度比下，注-波互作用效率可达27％。

Nonlinear simulation on 3 mm band second-harmonic complex cavity gyrotron with gradual transition

Starting from general transmission line equation with an electron beam, a self-consistent nonlinear analysis on 3 mm band second-harmonic complex cavity gyrotron with gradual transition is presented, in which the multiple mode interacting with a electron beam and mode coupling are taken into account, through a simulation code of self-consistent nonlinear beam-wave interaction made by ourselves. The influences of the magnetic field coefficient and current and the velocity ratio of the electron beam under the interaction between the electron beam and H_(02)-H_(03) RF field for second-harmonic gyrotron are analyzed. The results show that an electron efficiency over 27% is predicted for suitable dimensions for the complex cavity and magnetic field coefficient and current and the velocity ratio of the electron beam.