Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode  

作　　者：Mengfan ZHANG Dingguo LAI Qifu XU Mengtong QIU 张梦凡;来定国;徐启福;邱孟通

机构地区：[1]National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,People’s Republic of China [2]Department of Engineering Physics,Tsinghua University,Beijing 100084,People’s Republic of China

出　　处：《Plasma Science and Technology》2025年第4期88-94,共7页等离子体科学和技术(英文版)

基　　金：supported by National Natural Science Foundation of China(Nos.12027811 and 12275222)。

摘　　要：The cylindrical virtual cathode reflex triode is a new type of pulsed hard X-ray load,which has the advantages of simple structure,high radiation conversion efficiency,and simplicity in seriesparallel operation.This paper presents a method to reduce the impedance of the triode using a multiring cathode.The average electric field on the ring-cathode emission surface is enhanced due to edge effect,and the beam intensity is greatly increased in proportion to the square of the electric field strength.Multi-ring cathode is used to enlarge the emission area.Therefore,the reflex triode can work at lower impedance and generate a stronger beam under the same anode-cathode gap.In addition,the electric field enhancement of the cathode reduces the cathode emission stabilization time and enhances the operation stability of the triode.The effects of parameters such as ring width and ring gap on the triode impedance are simulated and studied.The cathode emission stabilization time and the X-ray conversion efficiency are compared.The design basis of cathode structure parameters and the impedance control method of the cylindrical virtual cathode reflex triode are given according to the simulations.

关 键 词：pulsed hard X-ray reflex triode high current electron beam bremsstrahlung(Some figures may appear in colour only in the online journal) 

分 类 号：O441.1[理学—电磁学]