Effect of multi-beam cathodes’ geometric size on emission uniformity of electron beams
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摘要: 在相对论速调管放大器(RKA)的探究实验中，多注RKA中电子束的打斑实验结果表明各注电子束的发射电流大小和横截面形状分布不一致甚至有很大差异影响了RKA的工作稳定性。通过粒子模拟软件对该问题进行相关仿真研究，探究多注阴极几何尺寸分布不一致对发射电流分布的影响。仿真结果表明，单注电子束阴极尺寸，尤其是横向尺寸的差异是影响多注电流大小分布不一致的主要因素，而且横向尺寸还将影响到多注电子束横向电子束形状，该研究对多注RKA的实验研究与优化设计具有指导意义。Abstract: During the experiment research of the Relative Klystron Amplifier(RKA) we found that there were huge differences between currents and the forms of every electron beam. We made a research on this problem with PIC simulation software to investigate the effect of geometric size on the emitted electron beam distribution, which indicates that difference of geometric size between multi-beam cathodes, especially the radial difference, is the main factor causing the multi-beam asymmetry. Besides, the cross section of electron beams has a certain relation with the radius of the cathodes.
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Key words:
- multiple electron beams /
- high power klystron /
- diode /
- cathode /
- electron beam quality
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