大回旋电子束双磁会切电子枪的设计
Design of large orbit gyrotron electron beam double- cusp gun
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摘要: 分析了Ka波段二次谐波回旋行波管双磁会切电子枪的理论模型，计算了电子枪的设计参数；采用EGUN软件进行模拟，设计出了产生大回旋电子束的双磁会切电子枪。该枪电压为70 kV，电流为3.35 A，电子束横纵速度比为1.62，速度零散为4.2%。给出了电子束速度比、速度零散沿轴线的分布，进而讨论了阳极电压对电子束性能的影响，结果表明选择适当的阳极电压和阴极磁场对得到好的电子束参量作用明显。Abstract: Theoretical model of a double- cusp gun for Ka- band second harmonic gyro- TWT amplifier was analyzed, and the electron beam performance parameters were calculated. Using EGUN simulation, a double- cusp gun producing large orbit gyration electron beam was designed with an anode voltage of 70 kV and a beam current of 3.35 A. The ratio of perpendicular to parallel velocity was 1.62 and its velocity spread was 4.2%. The distribution of electron beam velocity ratio and velocity spread on axis was discussed, and the effects of the anode voltage on electron beam performance was studied. The reseults show that proper anode voltage and cathode magnetic field are helpful in getting good electron beam parameters.
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