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激光尾波场加速到桌面辐射源

   目:激光尾波场加速到桌面辐射源
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 Shanghai Jiao Tong University. In a second scheme, we suggest to use two-color beat wave to control the injection length. When two laser pulses with fundamental frequency and high harmonics co-propagate with each other, a beat wave is generated and the highest electric field due to the overlapping of the two peaks of the two laser waves can ionize the internal electrons and trigger the ionization injection. Due to the phase velocity difference of the two color pulses, the ionization distance is very limited which then lowers the injection length. We demonstrate electron beam with ultralow energy spread less than 1% percent and central energy of 400MeV can be obtained by using and 3 laser pulses in a gas.

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.

 

    间: 2016120 8:45

    点:二教500会议室

    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

 

陈民,2002年在中国科学技术大学教改试点班获得理学学士学位,而后于2007年在中国科学院物理研究所获理学博士学位。2007年至2009年间受德国洪堡基金资助在亨利希海涅杜塞尔多夫大学从事洪堡博士后研究。随后加入美国劳伦斯伯克利国家实验室继续事激光等离子体尾波场加速方面的博士后研究。2012年入选中组部青年千人计划,同年加入上海交通大学;2013年入选上海市浦江人才计划。2006年以来与合编辑共发表相关论文90余篇,总引用率超过1260次,H因子19web of science)。

研究方向:激光等离子体物理、激光尾场加速及辐射、激光等离子体数值模拟

作为负责人现承担国家863、自然科学基金面上项目;作为骨干成员参加国家973A类项目、青千973项目

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