Author Affiliations
Abstract
1 Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China
2 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
3 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
We present an application of short-pulse laser-generated hard x rays for the diagnosis of indirectly driven double shell targets. Cone-inserted double shell targets were imploded through an indirect drive approach on the upgraded SG-II laser facility. Then, based on the point-projection hard x-ray radiography technique, time-resolved radiography of the double shell targets, including that of their near-peak compression, were obtained. The backlighter source was created by the interactions of a high-intensity short pulsed laser with a metal microwire target. Images of the target near peak compression were obtained with an Au microwire. In addition, radiation hydrodynamic simulations were performed, and the target evolution obtained agrees well with the experimental results. Using the radiographic images, areal densities of the targets were evaluated.
Matter and Radiation at Extremes
2024, 9(2): 027602
强激光与粒子束
2024, 36(1): 101004
1 国防科技大学理学院,湖南 长沙 410073
2 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
3 中国工程物理研究院研究生院,北京 100193
太赫兹波为高能量密度物质提供了独一无二的诊断手段,但在大型高能量密度装置上实现极端条件下物质状态的太赫兹时域光谱诊断技术仍面临巨大挑战。本文报道了在低重复频率、高能量激光装置上开展的光脉冲泵浦-太赫兹探测实验。利用钛宝石飞秒激光器输出焦耳量级的单发脉冲,单发脉冲经磷酸二氢钾倍频后加热30 nm厚自支撑金膜,产生均匀的温稠密金等离子体;同时,将大孔径铌酸锂晶片通过光整流产生的单脉冲能量为7 μJ的太赫兹脉冲作为探测光,利用金属阶梯镜实现了单发太赫兹波形探测,获得了温稠密金在太赫兹波段的时间分辨的电导率数据,为检验双温模型中电子-离子耦合系数等关键参数的准确性提供了新基准。
超快光学 太赫兹时域光谱 单发泵浦-探测 极端物态诊断 电导率 中国激光
2023, 50(17): 1714013
Author Affiliations
Abstract
1 Institute of Precision Optical Engineering, MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Curved crystal imaging is an important means of plasma diagnosis. Due to the short wavelengths of high-energy X rays and the fixed lattice constant of the spherical crystal, it is difficult to apply the spherical crystal in high-energy X-ray imaging. In this study, we have developed a high-energy, high-resolution X-ray imager based on a toroidal crystal that can effectively correct astigmatism. We prepared a Ge toroidal crystal for backlighting Mo Kα1 characteristic lines ( keV) and verified its high-resolution imaging ability in high-energy X-ray region, achieving a spatial resolution of 5–10 µm in a field of view larger than 1.0 mm.
laser plasma diagnostics toroidal crystal monochromatic X-ray imaging Chinese Optics Letters
2023, 21(10): 103401
Author Affiliations
Abstract
1 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi’an Jiaotong University Xi’an 710049 China
2 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730070 China
3 Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China
4 Hebei Key Laboratory of Compact Fusion Langfang 065001 China
5 ENN Science and Technology Development Co., Ltd. Langfang 065001 China
In preparation for an experiment with a laser-generated intense proton beam at the Laser Fusion Research Center at Mianyang to investigate the 11B(p,α)2α reaction, we performed a measurement at very low proton energy between 140 keV and 172 keV using the high-voltage platform at the Institute of Modern Physics, Lanzhou. The aim of the experiment was to test the ability to use CR-39 track detectors for cross-section measurements and to remeasure the cross-section of this reaction close to the first resonance using the thick target approach. We obtained the cross-section σ = 45.6 12.5 mb near 156 keV. Our result confirms the feasibility of CR-39 type track detector for nuclear reaction measurement also in low-energy regions.
Laser and Particle Beams
2023, 2023(1): 9697329
强激光与粒子束
2023, 35(1): 012007
强激光与粒子束
2022, 34(12): 122005
1 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
2 北京大学 物理学院,北京 100871
为了在百kJ高功率激光装置上建立D3He质子照相平台,采用一维辐射流体程序Helios-CR对D3He爆推靶质子产生进行了模拟,综合考虑多种因素给出在百千焦高功率激光装置上开展质子照相所需要的激光和靶球建议参数。结合激光装置现有条件,分析了在1015 W/cm2左右激光强度下D3He质子产额随靶球半径、激光强度、充气压力和SiO2球壳厚度等参数的变化规律,给出了靶球半径300 μm,内充D3He气体压强1.8 MPa,SiO2球壳厚度3.5 μm左右等优化参数,预计此条件下D3He质子产额可达109~1010。通过模拟得到的质子产额变化规律,为质子照相平台的正式建立和实验参数选取提供了参考。
直接驱动 爆推靶 单色质子源 direct drive implosion exploding pusher target monochromatic proton source 强激光与粒子束
2022, 34(12): 122003
强激光与粒子束
2022, 34(12): 122001
强激光与粒子束
2022, 34(11): 112001