冷阴极微波电子枪初步研究  

Preliminary study of cold cathode RF electron gun

作　　者：李相坤[1] 黎明[1] 

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《强激光与粒子束》2013年第B05期129-132,共4页High Power Laser and Particle Beams

摘　　要：基于场发射的冷阴极微波电子枪兼具光阴极微波电子枪和热阴极微波电子枪的优点,可望提供低发射度、低能散以及较高流强的电子束,应用于自由电子激光等领域。介绍了这种电子枪的特点,以及在中国工程物理研究院应用电子学研究所的研究进展。场发射通常要求非常高的电场强度,通过对金刚石薄膜进行掺杂,可以降低其有效功函数,从而在相对低的场强下获得足够高的发射电流。结合场发射的特点,从腔型、反轰、加速效率以及束流孔径等方面对冷阴极微波电子枪进行了设计,并给出了初步的设计结果。利用粒子模拟程序对该电子枪的场发射情况进行了模拟,结果表明有望获得发射度很低的电子束团。Cold cathode RF electron guns based on field emissions combine the characteristics of thermo-and photo-cathode RF guns and may provide low emittance,high current electron beams.Studies of such a gun in the Institute of Applied Electronics,CAEP,are presented here.The effective work function of diamond films is greatly reduced by doping so that valuable electron currents can be obtained at the presence of moderate electrical field strengths.A test RF gun was designed by taking into account many factors such as back-bombardment and accelerating efficiency.Particle tracking of such a gun was implemented and turned out that low emittance electron bunches can be obtained at the gun exit.However,the energy spectrum is not so good and needs improvement in the future.

关 键 词：场发射 微波电子枪 低发射度 高流强 粒子模拟 

分 类 号：TN201[电子电信—物理电子学]