论文部分内容阅读
激光等离子体尾波场加速器(LWFA,laser wake-field accelerator)作为一种新兴的台面型电子加速器,在越来越受到广泛关注的同时,也遇到了注入电子束团的来源、电子束团的俘获、加速电子束团的控制等问题,因此迫切需要寻找满足飞秒精度且易于实现的电子注入方法.光学注入法作为一种可控的内注入法,充分利用超短超快激光脉冲间相互碰撞后能预加速电子的特点,以等离子体中的背景电子为电子源,在等离子体尾波场中实现了对电子束团的有效注入、俘获、加速,得到了低能散、小发散度、短脉宽的高质量电子束团.该文简单阐述了LWFA中电子注入所面临的困难和现有的主要注入方法,综述了光学注入法的整个发展过程及最新研究进展,并以CPI(colliding pulse injection)为例讨论了如何用哈密顿量来研究LWFA中电子的注入俘获问题,希望能对该领域的研究提供一些新的思路.
LWFA (laser wake-field accelerator), as a new type of mesa electron accelerator, has attracted more and more attentions, and has also encountered the source of injected electron bunches. Capturing and accelerating the control of electron bunches etc. Therefore, it is urgent to find an electron injection method which can meet the femtosecond accuracy and is easy to realize.As a controllable internal implantation method, optical injection method makes full use of ultra-short ultra-fast laser pulses After the collision can pre-accelerate the electronic characteristics of the plasma background electrons as the electron source in the plasma tail wave field to achieve effective injection of electron bunches, capture, accelerate, get low energy dispersion, small divergence, Short pulse width and high quality electron bunch.This article briefly describes the difficulties of the electron injection in LWFA and the existing main injection methods, reviews the whole development process and the latest research progress of the optical injection method, pulse injection as an example to discuss how to use Hamiltonian to study the injection trapping of electrons in LWFA and hope to provide some new ideas for the research in this field.