Development of Synchronized Injection Gun for Laser Beat-wave Acceleration

本课题的目的是研制与激光热波同步的电子束源。为了实现激光粒子加速器，必须将注入的电子置于激发等离子体波势的加速阶段。所以我们尝试从激光触发的光电阴极发射电子。激光将很容易地控制电子的发射时间，从而使它们处于波势的任何相位。我们先后研制了两种电子源，第一种是不带激光光电阴极的，第二种是带激光光电阴极的。在第一年（1995年），我们对CO_2激光电子枪的马克思发生器进行了改进，使其能够提供1MeV的电子束。通过控制阴极阻抗，我们获得了超过1MeV的电子束。我们还首次使用20MeV直线加速器校准了一台20MeV电子能谱仪（ESM）。在第二年（1996年），我们开发了带有激光触发光电阴极的电子枪。脉冲电源为同轴马克思发电机，最大充电电压为1mv。我们得到了1MeV的电子。现在我们提供了用YAG激光二次谐波脉冲触发光电二极管的方法。

The purpose of this project is to develop the electron beam source, synchronized to the laser beat-wave. To realize a laser particle accelerator, we must put the injected electrons on the acceleration phase of the excited plasma wave potential. So that we have tried to emit electrons from a laser triggered photocathode. The laser will easily control the emission timing of the electrons, so as to put them on any phase of the wave potential. We have developed sequentially two electron sources, the first one without the laser photocathode and the second one with it.In the first year (1995), we have modified the Marx generator for the CO_2 laser electron gun to provide 1MeV electron beams. By controlling the cathode impedance, we have obtained more than 1MeV electron beams. Also we have for the first time calibrated a 20MeV electron spectrometer (ESM) by using the 20 MeV linear accelerator.In the second year (1996), we have developed the electron gun with a laser triggered photocathode. The Pulse power machine is a coaxial Marx generator and the maximum charging is 1 MV.We have obtained 1MeV electrons. Now we are providing to trigger the photo diode by using a YAG laser second harmonic pulse.