(1/2+1/2+1)腔型热阴极微波电子枪  

(1/2+1/2+1) cell structure type RF gun

作　　者：朱玲[1] 陈怀璧[1] 童德春[1] 林郁正[1] 

机构地区：[1]清华大学工程物理系加速器实验室,北京100084

出　　处：《强激光与粒子束》2004年第8期1033-1036,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10135040)

摘　　要：　介绍了一种新型的轴耦合热阴极微波电子枪的设计,该枪采用了缩短首腔以及在首腔与主加速腔间插入耦合半腔的设计思想,在不破坏粒子束性能的基础上尽量减小反轰功率,给出了用Superfish及Pamela软件进行物理设计以及粒子动力学计算的结果,在脉冲宽度为6μs,重复频率为25Hz时,阴极上平均反轰功率为3.6W,达到设计要求。In order to suppress the back bombardment of electrons in RF thermionic guns, a new kind of on axis coupled structure type RF gun was developed. It is composed of two half cells and a full cell. The first half cell is shortened and a half cell is inserted between the first half cell and the main accelerating cell to defocus the particles moving backwards with highest energy, thus the cathode back bombardment power is strongly reduced. For the field stability the π/2 mode is chosen. The electromagnetic field analytical codes SUPERFISH and PAMELA are mainly used to do the calculation and simulation. The average back bombardment power is about 3.6 W, assuming the pulse width of 6 μs and a repetition rate of 25 Hz.

关 键 词：微波电子枪 热阴极 电子反轰 发射度 腔长 空间电荷效应 

分 类 号：TL503[核科学技术—核技术及应用]