热阴极微波电子枪的改进设计  

Upgrade design of a thermionic cathode RF gun

作　　者：吴钢[1] 杨学平[1] 耿顺才[1] 王言山[1] 

机构地区：[1]中国科学院高能物理研究所,北京100080

出　　处：《强激光与粒子束》2003年第4期373-376,共4页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

摘　　要：　北京自由电子激光目前所用热阴极微波电子枪输出的电子束,在经过加速管加速后,位于微波脉冲前沿的电子束团存在能量偏高的现象,使得这部分电子无法对FEL增益做贡献。根据实验数据,分析了造成该现象的原因,提出一种可行的改进措施,即通过降低微波谐振腔的品质因数缩短建场时间,来消除该现象,以便提高整个装置的输出性能。There is an ununiformity with the electron beam energy spread at Beijing Free Electron Laser Facilities. It is observed that the electron energy in front of the current pulse rose much higher than the average, that this portion of electron bunches lost in the bending segment and could not devote its energy to laser gain. This disfigurement is considered to be caused by the difference of building time of microwave field inside the RF gun and the accelerator. One cavity with low quality factor to shorten this difference was introduced in this paper, and an upgrade design of new thermionic cathode made of this kind of cavity is expected to improve laser gain.

关 键 词：热阴极微波电子枪 改进设计 自由电子激光 品质因数 微波谐振腔 电子束能散度 微波脉冲 激光增益 

分 类 号：TN12[电子电信—物理电子学] TN248.6