【摘要】 用 MAGIC程序对设计的多种 1 2 Me V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=8.50 k A ,传输束流 I8≥ 3.0 k A ,打靶束流 I0 ≥ 2 .30 k A。更多还原

【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 is given,the optimum diode is obtained by comparing the results of experiment in 12MeV linear induction accelerator. The paper also gives SEM analysis and experiment comparison of velvet emission. Finally, emitted current I e=8.52kA ,beam current I 8≥3.0kA, targeted current I 0≥2.30kA with optimum diode are obtained.更多还原