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本文论述迴旋管磁控注入式绝热电子枪的计算方法。迴旋管电子运动于非旁轴磁场区,故必须准确求出空间磁场分布。本文采用的方法为:首先从轴上磁场实测值出发,用非线性曲线拟合法求出轴上磁场的解析表示式,再用谢尔茨展开式求出空间磁场。此法既避免了通常采用的轴上场近似函数与实测值不完全相符的问题,又避免了完全采用实测值的数值微分的误差,故得到较满意结果。绝热枪阴极附近场的处理对计算结果有敏感的影响,本文对此也作了妥善处理。根据螺旋形电子轨迹的特点,文中分析了轨迹计算中误差积累问题,指出Z向的误差积累比较严重,并提出了相应的减小误差的措施。
This article discusses the calculation method of the gyro-magnetron injection-type adiabatic electron gun. Gyro electron movement in non-paraxial magnetic field, it must accurately find the spatial distribution of the magnetic field. The method adopted in this paper is as follows: Firstly, starting from the measured value of the magnetic field on the shaft, the analytical expression of the magnetic field on the shaft is obtained by nonlinear curve fitting method, and then the space magnetic field is obtained by using the Shelter expansion. This method not only avoids the problem that the commonly used approximation function of on-axis field does not exactly match the measured value, but also avoids the error of the numerical differential of the measured value, so that the satisfactory result is obtained. The processing of the field near the cathode of the adiabatic gun has a sensitive effect on the calculation result, and this article also properly handles this field. According to the characteristics of spiral electron trajectory, the paper analyzes the problem of error accumulation in trajectory calculation, points out that the error accumulation in Z direction is serious, and puts forward the corresponding measures to reduce the error.