Methods of Generation and Detailed Characterization of Millimeter-Scale Plasmas Using a Gasbag Target
LI Zhi-Chao1,2**, ZHENG Jian2, JIANG Xiao-Hua1, WANG Zhe-Bin1, YANG Dong1, ZHANG Huan1, LI San-Wei1, WANG Feng1, PENG Xiao-Shi1, YIN Qiang1, ZHU Fang-Hua1, GUO Liang1,2, YUAN Peng2, LIU Shen-Ye1, DING Yong-Kun1
1Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 2CAS Key Laboratory of Basic Plasma Physics, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026
Methods of Generation and Detailed Characterization of Millimeter-Scale Plasmas Using a Gasbag Target
LI Zhi-Chao1,2**, ZHENG Jian2, JIANG Xiao-Hua1, WANG Zhe-Bin1, YANG Dong1, ZHANG Huan1, LI San-Wei1, WANG Feng1, PENG Xiao-Shi1, YIN Qiang1, ZHU Fang-Hua1, GUO Liang1,2, YUAN Peng2, LIU Shen-Ye1, DING Yong-Kun1
1Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 2CAS Key Laboratory of Basic Plasma Physics, and Department of Modern Physics, University of Science and Technology of China, Hefei 230026
摘要Gasbag targets are useful for the research of laser-plasma interactions in inertial confinement fusion, especially in the laser overlapping regime. We report that on the Shengguang-II laser facility, millimeter−scale plasmas are successfully generated by four 0.35 µm laser beams using a gasbag target. Multiple diagnostics are applied to characterize the millimeter−scale plasmas in detail. The images from the x-ray pinhole cameras confirm that millimeter-scale plasmas are indeed created. An optical Thomson scattering system diagnoses the electron temperature of the CH filling plasmas by probing the thermal ion-acoustic fluctuations, which indicates that the electron temperature has a 600 eV flat roof in 0.7–1.3 ns. Another key parameter, i.e. the electron density of the millimeter-scale plasmas, is inferred by the spectrum of the back stimulated Raman scattering of an additional 0.53 µm laser beam. The inferred electron density keeps stable at 0.1nc in early time consistent with the controlled filling pressure and splits into a higher density in late time, which is attributed to the blast wave entering into the SRS interaction region.
Abstract：Gasbag targets are useful for the research of laser-plasma interactions in inertial confinement fusion, especially in the laser overlapping regime. We report that on the Shengguang-II laser facility, millimeter−scale plasmas are successfully generated by four 0.35 µm laser beams using a gasbag target. Multiple diagnostics are applied to characterize the millimeter−scale plasmas in detail. The images from the x-ray pinhole cameras confirm that millimeter-scale plasmas are indeed created. An optical Thomson scattering system diagnoses the electron temperature of the CH filling plasmas by probing the thermal ion-acoustic fluctuations, which indicates that the electron temperature has a 600 eV flat roof in 0.7–1.3 ns. Another key parameter, i.e. the electron density of the millimeter-scale plasmas, is inferred by the spectrum of the back stimulated Raman scattering of an additional 0.53 µm laser beam. The inferred electron density keeps stable at 0.1nc in early time consistent with the controlled filling pressure and splits into a higher density in late time, which is attributed to the blast wave entering into the SRS interaction region.
LI Zhi-Chao;**;ZHENG Jian;JIANG Xiao-Hua;WANG Zhe-Bin;YANG Dong;ZHANG Huan;LI San-Wei;WANG Feng;PENG Xiao-Shi;YIN Qiang;ZHU Fang-Hua;GUO Liang;YUAN Peng;LIU Shen-Ye;DING Yong-Kun
. Methods of Generation and Detailed Characterization of Millimeter-Scale Plasmas Using a Gasbag Target[J]. 中国物理快报, 2011, 28(12): 125202-125202.
LI Zhi-Chao, **, ZHENG Jian, JIANG Xiao-Hua, WANG Zhe-Bin, YANG Dong, ZHANG Huan, LI San-Wei, WANG Feng, PENG Xiao-Shi, YIN Qiang, ZHU Fang-Hua, GUO Liang, YUAN Peng, LIU Shen-Ye, DING Yong-Kun
. Methods of Generation and Detailed Characterization of Millimeter-Scale Plasmas Using a Gasbag Target. Chin. Phys. Lett., 2011, 28(12): 125202-125202.
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2011, Vol. 28 
