基于双频栅控电子枪的组合型注入器设计  

Design of Combined Injector Based on Dual-frequency Gated Gun

作　　者：韩小溪 杨鹏 HAN Xiaoxi;YANG Peng(Naval Equipment Department,Beijing 100021;China Ship Research and Design Center,Wuhan 430064)

机构地区：[1]海军装备部,北京100021 [2]中国舰船研究设计中心,武汉430064

出　　处：《舰船电子工程》2021年第11期164-167,189,共5页Ship Electronic Engineering

摘　　要：大功率的太赫兹波段自由电子激光要求电子注入器能够提供横向发射度低、能散小、束团长度短、峰值电流高的束流。为了同时满足自由电子激光对束流品质和紧凑性、稳定性的要求,论文提出了一种由双频栅控电子枪和直线加速器构成的组合型注入器。该注入器可通过以加速器工作主频为基频叠加其三倍频形成的双频场对电子枪中的阴栅极进行调制,从而获得较高的电子捕获效率和较短的高亮度束团。由于加速器中的速度聚束效应,在组合型注入器出口处可以得到具有良好对称性且长度小于10ps的电子束团。论文介绍了双频栅控电子枪的设计,并进行了直线加速器的束流动力学数值计算,最后完成了组合型注入器的全过程束流动力学仿真。High power terahertz(THz)free-electron laser(FEL)requires electron injectors capable of generating beam with low transverse emittance,small energy spread,short bunch length and high peak-current.A combined injector consisting of a du⁃al-frequency gated gun and a LINAC has been proposed to meet the requirements of FEL for beam quality,compactness and stabili⁃ty.The performance of the injector with high electron capture efficiency and high brightness short bunch can be obtained by modulat⁃ing cathode-grid through the fundamental and 3rd harmonic of the LINAC frequency.Because of the velocity bunching effect in the LINAC,bunches with good symmetry and length less than 10ps can be obtained at the exit of the injector.In this paper,the design of the gun and beam dynamics calculations of the LINAC are completed.Finally,start-to-end simulations of the combined injector is presented.

关 键 词：自由电子激光 双频栅控电子枪 直线加速器 束团品质 

分 类 号：TL53[核科学技术—核技术及应用]