Shaw J L, Romo-Gonzalez M A, Lemos N, King P M, Bruhaug G, Miller K G, Dorrer C, Kruschwitz B, Waxer L, Williams G J, Ambat M V, McKie M M, Sinclair M D, Mori W B, Joshi C, Chen Hui, Palastro J P, Albert F, Froula D H
Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623 USA.
California State University Stanislaus, Turlock, CA 95382 USA.
Sci Rep. 2021 Apr 5;11(1):7498. doi: 10.1038/s41598-021-86523-5.
Laser-plasma accelerators (LPAs) driven by picosecond-scale, kilojoule-class lasers can generate particle beams and x-ray sources that could be utilized in experiments driven by multi-kilojoule, high-energy-density science (HEDS) drivers such as the OMEGA laser at the Laboratory for Laser Energetics (LLE) or the National Ignition Facility at Lawrence Livermore National Laboratory. This paper reports on the development of the first LPA driven by a short-pulse, kilojoule-class laser (OMEGA EP) connected to a multi-kilojoule HEDS driver (OMEGA). In experiments, electron beams were produced with electron energies greater than 200 MeV, divergences as low as 32 mrad, charge greater than 700 nC, and conversion efficiencies from laser energy to electron energy up to 11%. The electron beam charge scales with both the normalized vector potential and plasma density. These electron beams show promise as a method to generate MeV-class radiography sources and improved-flux broadband x-ray sources at HEDS drivers.
由皮秒级、千焦级激光驱动的激光等离子体加速器（LPA）能够产生粒子束和X射线源，这些可用于由多千焦、高能量密度科学（HEDS）驱动源驱动的实验，例如激光能量学实验室（LLE）的欧米伽激光或劳伦斯利弗莫尔国家实验室的国家点火装置。本文报道了首个由连接到多千焦HEDS驱动源（欧米伽）的短脉冲、千焦级激光（欧米伽EP）驱动的LPA的进展情况。在实验中，产生的电子束具有大于200兆电子伏特的电子能量、低至32毫弧度的发散角、大于700纳库仑的电荷量以及高达11%的从激光能量到电子能量的转换效率。电子束电荷量与归一化矢量势和等离子体密度均成正比。这些电子束有望成为在HEDS驱动源处产生兆电子伏特级射线照相源和通量更高的宽带X射线源的一种方法。
