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文章用一个2 1/2维二极管模拟程序,研究了不同形状的无箔二极管在不同电压、不同导引磁场下的电子束输出特性。程序考虑了空间电荷效应,束流自磁场的各个分量及电子的三维运动,并使用了Child-Langmuir发射定律,计算上采用非均匀差分网格。计算结果表明,二极管形状及所加电压和磁场对输出电子束都有很大影响。导引磁场越强,输出束流越大,发散性越小。磁场大到一定程度后,束流不再增加,反而稍有降低。
In this paper, a 2 1/2 -dimensional diode simulation program was used to study the electron beam output characteristics of different shape foilless diodes under different voltages and different guiding magnetic fields. The program takes into account the space charge effect, the beam component from the magnetic field and the three-dimensional motion of the electrons, and uses the Child-Langmuir law of emission, which is calculated using a non-uniform difference grid. The calculated results show that the diode shape and the applied voltage and magnetic field have a great influence on the output electron beam. The stronger the guidance magnetic field, the larger the output beam current, the smaller the divergence. After the magnetic field to a certain extent, the beam will not increase, but slightly lower.