作者
T Toncian, C Wang, E McCary, A Meadows, AV Arefiev, J Blakeney, K Serratto, D Kuk, C Chester, R Roycroft, L Gao, H Fu, XQ Yan, J Schreiber, I Pomerantz, A Bernstein, H Quevedo, G Dyer, T Ditmire, BM Hegelich
发表日期
2016/1/1
期刊
Matter and Radiation at Extremes
卷号
1
期号
1
页码范围
82-87
出版商
AIP Publishing
简介
The irradiation of few-nm-thick targets by a finite-contrast high-intensity short-pulse laser results in a strong pre-expansion of these targets at the arrival time of the main pulse. The targets decompress to near and lower than critical densities with plasmas extending over few micrometers, ie multiple wavelengths. The interaction of the main pulse with such a highly localized but inhomogeneous target leads to the generation of a short channel and further self-focusing of the laser beam. Experiments at the Glass Hybrid OPCPA Scaled Test-bed (GHOST) laser system at University of Texas, Austin using such targets measured non-Maxwellian, peaked electron distribution with large bunch charge and high electron density in the laser propagation direction. These results are reproduced in 2D PIC simulations using the EPOCH code, identifying direct laser acceleration (DLA)[1] as the responsible mechanism. This is the first …
引用总数
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