Electron Bunch Length Measurements from Laser-Accelerated Electrons Using Single-Shot THz Time-Domain Interferometry
Electron Bunch Length Measurements from Laser-Accelerated Electrons Using Single-Shot THz Time-Domain Interferometry
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DOI：
10.1103/physrevlett.104.084802
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发表时间：
2010-02-26
影响因子：
8.6
通讯作者：
Karsch, S.
中科院分区：
文献类型：
--
作者：
Debus, A. D.;Bussmann, M.;Karsch, S.
基于激光等离子体尾场的电子加速器有望产生具有前所未有的峰值电流的超短电子束。然而，它们的实际脉冲持续时间从未在单次实验中直接测量过。我们目前的测量超短持续时间的电子束通过太赫兹时域干涉术。使用0.5 J，45 fs，800 nm激光器和基于ZnTe的电光装置获得的数据，我们证明了激光加速的准单能电子聚束的持续时间[最佳拟合为32 fs（FWHM），90%置信度上限为38 fs]比驱动激光脉冲短，但与等离子体周期相似。
Laser-plasma wakefield-based electron accelerators are expected to deliver ultrashort electron bunches with unprecedented peak currents. However, their actual pulse duration has never been directly measured in a single-shot experiment. We present measurements of the ultrashort duration of such electron bunches by means of THz time-domain interferometry. With data obtained using a 0.5 J, 45 fs, 800 nm laser and a ZnTe-based electro-optical setup, we demonstrate the duration of laser-accelerated, quasimonoenergetic electron bunches [best fit of 32 fs (FWHM) with a 90% upper confidence level of 38 fs] to be shorter than the drive laser pulse, but similar to the plasma period.