From laser wakefield acceleration to tabletop synchrotron radiation source
主要内容: Laser wakefield acceleration has great potential for the next generation of compact radiation sources due to its three orders of magnitude larger accelerating gradient than traditional ones. Currently both the acceleration and radiation part should be improved for advanced applications. In this talk we will focus on the beam quality improvement in the first part by using ionization injection and on the last radiation part by using compact plasma undulator.
To get low energy spread electron beam, two injection schemes are proposed here. By use of certain initially unmatched laser pulses, the electron injection can be constrained to the very front region of the mixed gas target, typically in a length of a few hundreds micro meters determined by laser-driven bubble deformation, and energy spread is largely reduced. By using this method, electron beam with FWHM energy spread less than 5% and peak energy around 500MeV is demonstrated by simulations. We will show some recent experimental demonstration of this scheme at Laboratory for Laser Plasmas at
To make a compact radiation source, we propose an all-optical synchrotron-like radiation source based on laser-plasma acceleration either in a straight or in a curved plasma channel. With the laser pulse off-axially injected in a straight channel, the centroid oscillation of the pulse causes a wiggler motion of the whole accelerating structure including the trapped electrons, leading to strong synchrotron-like radiations with tunable spectra. It is further shown that a ring-shaped synchrotron is possible in a curved plasma channel. Due to the intense acceleration and bending fields inside plasmas, the central part of the sources can be made within palm size. With its potential of high flexibility and tunability, such compact light sources once realized would find applications in wide areas and make up the shortage of large synchrotron radiation facilities.
主办单位： 理学院 科技处
报 告人： 陈民 博士 上海交通大学物理系特别研究员 中组部青年千人计划入选者