W波段二次谐波突变复合腔回旋管数值模拟
Simulation of W-band second-harmonic complex cavity gyrotron with abrupt transiton
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摘要: 通过对二次谐波低电压突变结构复合腔回旋管中谐振腔结构、模式竞争以及电子注-波互作用的研究，分析了高频结构特性、寄生模式的抑制和工作参数优化等问题。给出了3 mm 二次谐波低损耗TE02/TE03模式回旋管的模拟设计结果。计算采用了坡度磁场，互作用效率得到显著提高。PIC粒子模拟结果表明:在电子注电压25 kV、电流4 A、纵横速度比1.6、工作磁场1.72 T时，回旋管可获得37 kW 的输出功率，横向运动能量转换效率高达51%，器件效率为37%。Abstract: By studying the cavity structure of a second-harmonic complex cavity gyrotron with abrupt transition, the modes competition and the interaction between the electron beam and wave, the characteristics of the RF structure, suppression of parasite oscillations and optimization of the work parameters are discussed. The simulation results of the low-loss TE02/TE03 low-voltage gyrotron are given. Using a gradient magnetic field in calculation, the interaction efficiency is significantly improved. PIC simulation results show that the gyrotron can generate 37 kW at 94 GHz with 37% efficiency with a 25 kV, 4 A and velocity ratio 1.6 beam.
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Key words:
- high power microwave /
- complex cavity /
- abrupt transition /
- gyrotron /
- second-harmonic /
- low-voltage
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