用于花瓣形加速器的栅控电子枪研制  

Development of grid-controlled electron gun for Rhodotron

作　　者：秦臻 刘平[1] 李晨[1] 唐若 赵伟 陈欣 杨洁[1] 向军[1] 李天涛[1] 黄刚[1] 何小中[1] Qin Zhen;Liu Ping;Li Chen;Tang Ruo;Zhao Wei;Chen Xin;Yang Jie;Xiang Jun;Li Tiantao;Huang Gang;He Xiaozhong(Institute of Fluid Physics,CAEP,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2025年第4期78-85,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(12005209,12205280)。

摘　　要：花瓣型加速器是一种具有结构紧凑、高效率特点的加速器装置,其运行依赖一种高重复频率、短脉冲且低发射度的电子枪,以确保最佳的加速性能。据此展示了该类电子枪的物理设计、模拟仿真、样机研制和束流测试情况。该电子枪设计为一种基于钡钨热阴极的栅控电子枪,采用皮尔斯结构,其阴极电压-40 kV,工作重复频率为10.75 MHz,设计的最大发射电流可达200 mA,单个脉冲最小长度不超过3 ns。实际测试中,该电子枪在阴极热子工作参数0.95 A/6.7 V,加载阴极直流电压-40 kV,栅控电压290 V/10 MHz时,测得峰值发射电流为204 mA。当束流脉冲长度底宽2.7 ns时,束流幅值为39.2 mA,还测试得到实际束流发射度小于2 mm·mrad,满足设计和加速器应用需求。The Rhodotron is a compact and highly efficient accelerator.This accelerator requires an electron gun with high repetition frequency,short pulses and low emittance,to ensure optimal acceleration performance.This paper shows the physical design,simulation,prototype development and beam testing of such an electron gun.The electron gun is designed as a grid-controlled electron gun based on a barium-tungsten thermionic cathode.The electron gun adopts a Pierce structure.It has a cathode voltage of-40 kV,an operating repetition frequency of 10.75 MHz,a design emission current of 200 mA maximum,and a single minimum pulse length of 3 ns.In the actual test,the electron gun measured a peak emission current of 204 mA with the cathode heater operating at 0.95 A/6.7 V,loaded cathode DC voltage-40 kV,and gate control voltage 290 V/10 MHz.When the beam pulse length is 2.7 ns,the beam current amplitude is 39.2 mA,and the actual beam emittance is less than 2 mm mrad.This result meets the design and accelerator application requirements.

关 键 词：花瓣型加速器 电子枪 栅控 热阴极 束流测试 发射度 

分 类 号：O463.1[机械工程—光学工程]