基于laser尾场加速器的飞秒电子和X射线源
Femtosecond electron and x-ray source based on laser wakefield accelerator
摘要：
在太瓦级超快高场装置（TUHFF）上研制了一台太瓦级台式相对论电子激光尾场加速源。给出了利用该飞秒电子源对液态水进行超快辐解的初步结果。提出了一种基于超高真空度飞秒激光器的飞秒X射线源。汤姆逊散射的加速电子的反向传播太瓦激光束将被用来产生千电子伏的X射线光子。估计了该X射线源的预期参数。短的脉冲持续时间，高通量，以及良好的准直的X射线光束将有利于超快时间分辨X射线吸收研究的气体，液体和固体中的短寿命瞬态物种。有人认为，溴原子的溶剂化动力学产生的光诱导电子脱离溴化水溶液将使第一个泵探测实验使用这种X射线源的一个方便的选择。
英文摘要：
A terawatt tabletop laser wakefield acceleration source of relativistic electrons has been developed in our Terawatt Ultrafast High Field Facility (TUHFF). The preliminary results for ultrafast radiolysis of liquid water using this femtosecond electron source are presented. A TUHFF based femtosecond x-ray source is proposed. Thomson scattering of the accelerated electrons off a counterpropagating terawatt laser beam will be used to generate keV x-ray photons. The expected parameters of this x-ray source have been estimated. The short pulse duration, high flux, and good collimation of the resulting x-ray beam would be conducive for ultrafast time-resolved x-ray absorption studies of short-lived transient species in gases, liquids, and solids. It is argued that the solvation dynamics of Br atoms generated in photoinduced electron detachment from aqueous bromide would make a convenient choice for the first pump-probe experiment using this x-ray source.
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