激光-近临界等离子体高能高亮度X射线的产生

杨月; 赵宗清; 郑建华; 张天奎

doi:doi:10.11884/hplpb201729.170138

强激光与粒子束, 2017, 29 (8): 082003, 网络出版: 2017-06-30

激光-近临界等离子体高能高亮度X射线的产生

Production of bright high-energy X-rays based on interaction of laser and near-critical-density plasma

论文大纲

杨月赵宗清郑建华张天奎

作者单位

中国工程物理研究院激光聚变研究中心, 等离子体物理重点实验室, 四川绵阳 621900

激光近临界大电量高能X射线微焦点 laser near-critical high-charge high-energy X-ray micro spot

摘要

基于激光驱动超热电子产生的高品质X射线源是高能量密度实验中有效的诊断技术手段, 对辐射源亮度、穿透性和时空分辨率等特性具有极高的要求。结合粒子模拟和蒙特卡罗模拟研究, 首先利用近临界密度等离子体实现了激光自聚焦通道中的大电量高能电子加速, 通过直接加速机制产生了电量超过600 nC、有效温度可达15 MeV的高能电子; 以此为基础提高电子-光子能量转换率, 有效优化了光子能量和产额, 并通过一定的转换靶参数优化方案产生了微焦点(FWHM小于200 μm)、高能、高亮度X射线, 为高空间分辨(小于200 μm)成像诊断提供了很好的途径, 有望早日实现激光等离子体轫致辐射单脉冲瞬态照相的实际应用。

Abstract

Laser-driven electrons can produce high-quality X-ray source with broad applications including measurement of shock-compressed matters, inertial confinement fusion and laboratory astrophysics. For high energy density experiments, bright high-resolution diagnosis radiation is required. To meet the requirement, it is decisive to optimize the production of hot electrons and radiation emission. In this paper, we combine the Particle-In-Cell and Monte Carlo simulation, firstly use near-critical-density plasma to accelerate high-charge energetic electrons (exceeds 600 nC, 15 MeV) by direct laser acceleration in self-focusing channel, then get enhanced energy conversion between electrons and photons, finally obtain brilliant micro-spot (FWHM<200 μm) high-energy X-rays via parameter optimization. Our findings provide a promising access to high-spatial-resolution (<200 μm) diagnostics, and it is hopeful to realize single-pulse transient imaging based on laser-plasma bremsstrahlung source.

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杨月, 赵宗清, 郑建华, 张天奎. 激光-近临界等离子体高能高亮度X射线的产生[J]. 强激光与粒子束, 2017, 29(8): 082003. Yang Yue, Zhao Zongqing, Zheng Jianhua, Zhang Tiankui. Production of bright high-energy X-rays based on interaction of laser and near-critical-density plasma[J]. High Power Laser and Particle Beams, 2017, 29(8): 082003.

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