光阴极RF腔注入器束流发射度研究
Beams emittance study in an injector of photocathode RF cavity
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摘要: 分析了光阴极RF腔注入器中的RF场效应和空间电荷效应，给出了电子在加速腔中束流发射度的解析表达式，它说明在加速过程中束流发射度是振荡变化的。利用SUPERFISH和GPT程序模拟计算了光阴极1+1/2腔注入器输出束流发射度与加速场强、注入相位、束团大小和形状、束团电荷的关系。适当选择这些条件，可以获得横向发射度小于2πmm·mrad 的输出束流。Abstract: Beams emittance is a very important parameter of the RFinjector, it is growth due to RF field space charge effects and so on. The analytical expression of beams emittance in RF injector has been given in this paper, it shows that beams emittance is various in RF injector. The dependences of beams emittance at the exit of a 1+1/2 cell photo-cathode injector on field strength, initial phase, beam size, bunch length and charge, etc are researched respectively using SUPERFISH and GPT programs. Beams emitance of less than 2πmm·mrad can be obtained by appropriately choosing these parameters.
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Key words:
- rfinjector /
- beams emittance /
- rf field effect /
- space charge effect
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