激光-近临界等离子体高能高亮度X射线的产生

发布时间：2018-06-18 20:46

  本文选题：激光 + 近临界　； 参考：《强激光与粒子束》2017年08期

【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600nC、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200μm)、高能、高亮度X射线,为高空间分辨(小于200μm)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]:The high quality X-ray source based on laser driven super hot electron is an effective diagnostic technique in high energy density experiment. It has very high requirements for the luminance, penetration and space-time resolution of the radiation source. In combination with particle simulation and Monte Carlo simulation, the high energy electron acceleration in the laser autofocus channel is first achieved by using a near critical density plasma. Through the direct acceleration mechanism, high energy electrons with electric quantity exceeding 600nC and effective temperature up to 15 MeV are produced, which can be used as a basis to improve the electron-photon energy conversion rate and effectively optimize the photon energy and yield. The FWHM of FWHM is less than 200 渭 m, and the high energy and brightness X-ray is produced by a certain conversion target parameter optimization scheme, which provides a good way for the imaging diagnosis of high spatial resolution (less than 200 渭 m). It is expected that the practical application of Bremsstrahlung monopulse transient photography of laser plasma will be realized at an early date.
【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;
【基金】：国家自然科学基金项目(11375161,11505166) 等离子体物理重点实验室基金项目(9140C680301150C68297)
【分类号】：O434.1;O53
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本文编号：2036815