Direct, Absolute, and In Situ Measurement of Fast Electron Transport via Cherenkov Emission
Direct, Absolute, and In Situ Measurement of Fast Electron Transport via Cherenkov Emission
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DOI：
10.1103/physrevlett.104.055001
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发表时间：
2010-02-05
影响因子：
8.6
通讯作者：
Zheng, Jian
中科院分区：
文献类型：
--
作者：
Habara, Hideaki;Ohta, Kazuhide;Zheng, Jian
我们提出了强烈的，飞秒激光与固体相互作用中产生的相对论电子的绝对能量分布的直接测量。对这些电子在新型棱镜靶中辐射的切伦科夫辐射进行光谱色散，同时获得电子的产额和能量分布。一个关键的进展是观察到了粒子模拟预测的高密度电子流及其在靶内的传输。此外，强烈的鞘层电位存在于靶的后侧推断来自切伦科夫光观测与磁谱仪的电子光谱的比较。
We present direct measurements of the absolute energy distribution of relativistic electrons generated in intense, femtosecond laser interaction with a solid. Cherenkov emission radiated by these electrons in a novel prism target is spectrally dispersed to obtain yield and energy distribution of electrons simultaneously. A crucial advance is the observation of high density electron current as predicted by particle simulations and its transport as it happens inside the target. In addition, the strong sheath potential present at the rear side of the target is inferred from a comparison of the electron spectra derived from Cherenkov light observation with that from a magnet spectrometer.