Ren Jieru, Deng Zhigang, Qi Wei, Chen Benzheng, Ma Bubo, Wang Xing, Yin Shuai, Feng Jianhua, Liu Wei, Xu Zhongfeng, Hoffmann Dieter H H, Wang Shaoyi, Fan Quanping, Cui Bo, He Shukai, Cao Zhurong, Zhao Zongqing, Cao Leifeng, Gu Yuqiu, Zhu Shaoping, Cheng Rui, Zhou Xianming, Xiao Guoqing, Zhao Hongwei, Zhang Yihang, Zhang Zhe, Li Yutong, Wu Dong, Zhou Weimin, Zhao Yongtao
MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an, 710049, China.
Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, 621900, China.
Nat Commun. 2020 Oct 14;11(1):5157. doi: 10.1038/s41467-020-18986-5.
Intense particle beams generated from the interaction of ultrahigh intensity lasers with sample foils provide options in radiography, high-yield neutron sources, high-energy-density-matter generation, and ion fast ignition. An accurate understanding of beam transportation behavior in dense matter is crucial for all these applications. Here we report the experimental evidence on one order of magnitude enhancement of intense laser-accelerated proton beam stopping in dense ionized matter, in comparison with the current-widely used models describing individual ion stopping in matter. Supported by particle-in-cell (PIC) simulations, we attribute the enhancement to the strong decelerating electric field approaching 1 GV/m that can be created by the beam-driven return current. This collective effect plays the dominant role in the stopping of laser-accelerated intense proton beams in dense ionized matter. This finding is essential for the optimum design of ion driven fast ignition and inertial confinement fusion.
由超高强度激光与样品箔相互作用产生的强粒子束在射线照相、高产额中子源、高能量密度物质产生以及离子快速点火等方面提供了多种选择。准确理解密集物质中的束流传输行为对于所有这些应用都至关重要。在此，我们报告了实验证据，表明与目前广泛使用的描述单个离子在物质中阻止的模型相比，强激光加速质子束在密集电离物质中的阻止能力提高了一个数量级。在粒子模拟（PIC）的支持下，我们将这种增强归因于束流驱动的回流电流可产生接近1 GV/m的强减速电场。这种集体效应在密集电离物质中激光加速强质子束的阻止过程中起主导作用。这一发现对于离子驱动快速点火和惯性约束聚变的优化设计至关重要。
