Uniform Laser-Driven Relativistic Electron Layer for Coherent Thomson Scattering
Uniform Laser-Driven Relativistic Electron Layer for Coherent Thomson Scattering
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DOI：
10.1103/physrevlett.104.234801
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发表时间：
2010-06-08
影响因子：
8.6
通讯作者：
Hegelich, B. M.
中科院分区：
文献类型：
--
作者：
Wu, H. -C.;Meyer-ter-Vehn, J.;Hegelich, B. M.
提出了一种用于相干汤姆逊背散射的均匀相对论电子层的新方案。一个几个周期的激光脉冲被用来产生电子层从一个半固态箔。新方案的关键元素是一个额外的箔，它反射驱动激光脉冲，但让电子几乎不受干扰地通过。利用二维粒子模拟和著名的基本理论，它表明，电子，与驱动和反射的激光脉冲相互作用后，形成一个非常均匀的飞片自由巡航与高相对论伽马因子正好在驱动激光方向（没有横向动量）。它以4伽马（2）的全多普勒频移因子反向散射探测光。讨论了层膨胀引起的反射率及其衰减。
A novel scheme is proposed to generate uniform relativistic electron layers for coherent Thomson backscattering. A few-cycle laser pulse is used to produce the electron layer from an ultrathin solid foil. The key element of the new scheme is an additional foil that reflects the drive-laser pulse, but lets the electrons pass almost unperturbed. Making use of two-dimensional particle-in-cell simulations and well-known basic theory, it is shown that the electrons, after interacting with both the drive and reflected laser pulses, form a very uniform flyer freely cruising with a high relativistic gamma factor exactly in the drive-laser direction (no transverse momentum). It backscatters the probe light with a full Doppler shift factor of 4 gamma(2). The reflectivity and its decay due to layer expansion are discussed.