论文部分内容阅读
提出一种新的紧凑型强流电子枪结构。紧凑型自聚束微波电子枪是一个多驻波腔结构,最大特点是腔与腔之间相互没有耦合,每腔可分别独立馈入功率和调节相位。通过选择合适的馈入功率和高频相位搭配,能够得到较优的束流品质。在此基础上采用外注入电子束的结构,能进一步增大流强和降低能散度,同时消除电子反轰对阴极工作的不利影响。利用Su-perfish和Parmela程序对腔体结构和束流动力学反复进行计算,确定了一组结构和工作参数。模拟结果表明出束微脉冲峰值流强可以到18 A,能散度小于2‰,横向发射度小于6πmm.mrad。最后给出腔体冷侧结果,与模拟计算结果吻合得较好。
A new compact structure of a strong current electron gun is proposed. Compact self-focusing microwave electron gun is a multi-standing wave cavity structure, the most prominent feature is the cavity and the cavity is not coupled with each other, each cavity can be fed separately power and phase adjustment. By selecting the appropriate feed-in power and high-frequency phase matching, better beam quality can be obtained. On the basis of this, the structure of injecting electron beam outside can further increase the flow intensity and reduce the energy divergence, and at the same time, eliminate the adverse effect of electron back-bombing on the cathode work. Su-perfish and Parmela programs were used to iteratively calculate the cavity structure and beam dynamics to determine a set of structural and operating parameters. The simulation results show that the beam peak pulse intensity can reach 18 A, the energy divergence is less than 2 ‰, the lateral emittance is less than 6πmm.mrad. Finally, the cold side of the cavity is given, which is in good agreement with the simulation results.