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本文模拟了弱流电子枪发射系统在不同尺寸和不同电压比下的电场分布。通过模拟实验,发现函数φ(z)=ηz~ξ能在发射系统透镜场的整个区域内良好地分段逼近所模拟的轴上电位。将此函数代入轨迹方程解出轨迹函数r(z),推导出计算交叉截面各参量的公式,从而找到了由轴上电位直接计算交叉截面各参量的一种方法。通过可动电极样管对电子束张角作了实验验证,结果一致。这对于弱流电子枪的设计有着实用价值。
This paper simulates the electric field distribution of the weak electron gun launcher system under different sizes and different voltage ratios. Through simulation experiments, it is found that the function φ (z) = ηz ~ ξ can be well approximated to the simulated on-axis potential in the entire region of the transmission system lens field. This function is substituted into the trajectory equation to solve the trajectory function r (z), and the formula for calculating the parameters of the cross section is derived. Thus, a method for calculating the cross section parameters directly from the on-axis potential is found out. Through the movable electrode sample tube electron beam angle experimentally verified, the results are consistent. This is of practical value to the design of weak current electron gun.