12MeV直线感应加速器二极管优化设计研究
Optimum Design for 12MeV Linear Induction Accelerator Diode
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摘要: 本文用MAGIC程序对设计的多种12MV直线感应加速器的二极管结构进行模拟计算，得出了二极管阴极表面电场强度分布，并根据实验研究结果，得到了结构最佳设计的二极管模型；随后利用扫描电镜方法对不同天鹅绒的结构进行了分析与发射性能实验研究。最后得到优化后的二极管产生的电子束束流参数为发射束流Ie=8.50kA，传输束流I8=3.0kA ，打靶束流I0=2.30kA。Abstract: A series of optimization designs of electron diode in 12MeV linear induction accelerator are studied by using numerical simulation code MAGIC and experiment method in order to improve the electron beam quality.MAGIC code solves the Maxwell equations in the presence of charged particle,Electron field distribution on cathode surface which influences electron emission can be given,the optimum diode is obtained by comparing to the results of experiment in 12MeV, then the paper gives SEM analysis and experiment comparison of velvet emission. Finally, emitted current Ie= 8.52kA ,beam current I8= 3.0kA, targeted current I0= 2.30kA with optimum diode are obtained.
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Key words:
- linear induction accelerator /
- diode /
- optimization design /
- velvet /
- electron current
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