Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

doi:10.1088/1674-1056/19/2/025201

中国物理B ›› 2010, Vol. 19 ›› Issue (2): 25201-025201.doi: 10.1088/1674-1056/19/2/025201

Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

李永升¹, 张继彦², 杨家敏², 江少恩², 杨国洪², 丁耀南², 黄翼翔², 胡昕²

(1)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (2)Research Centre of Laser Fusion, P. O. Box 919-986, Mianyang 621900, China

收稿日期:2009-05-01 修回日期:2009-05-21 出版日期:2010-02-15 发布日期:2010-02-15
基金资助:
Project supported by the Science and Technology Fund of the China Academy of Engineering Physics (Grant No. 2007B08003).

Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

Zhang Ji-Yan(张继彦)^a)†, Yang Jia-Min(杨家敏)^a), Jiang Shao-En(江少恩)^a), Li Yong-Sheng(李永升)^b), Yang Guo-Hong(杨国洪)^a), Ding Yao-Nan(丁耀南)^a), Huang Yi-Xiang(黄翼翔)^a), and Hu Xin(胡昕)^a)

^a Research Centre of Laser Fusion, P. O. Box 919-986, Mianyang 621900, China; ^b Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received:2009-05-01 Revised:2009-05-21 Online:2010-02-15 Published:2010-02-15
Supported by:
Project supported by the Science and Technology Fund of the China Academy of Engineering Physics (Grant No. 2007B08003).

摘要/Abstract

摘要： The behaviours of ionization and shock propagation in radiatively heated material is crucial for the understanding of indirect drive inertial confinement fusion as well as some astrophysics phenomena. In this work, radiation field with a peak temperature of up to 155 eV was generated in a gold cavity heated by four laser beams on the SG-II laser system and was used to irradiate a plastic foam cylinder at one end. The radiatively ablated foam cylinder was then backlighted side-on by x-ray from a laser-irradiated Ti disk. By observing the transmission decrease due to the shock compression of the foam cylinder, the trajectories of shock front were measured, and from the onset of the intense thermal emission from the side of the cylinder, the propagations of the ionization front were also observed on the same shot. The experimental measurements were compared to predictions of the radiation hydrodynamics code Multi-1D and reasonable agreements were found.

Abstract: The behaviours of ionization and shock propagation in radiatively heated material is crucial for the understanding of indirect drive inertial confinement fusion as well as some astrophysics phenomena. In this work, radiation field with a peak temperature of up to 155 eV was generated in a gold cavity heated by four laser beams on the SG-II laser system and was used to irradiate a plastic foam cylinder at one end. The radiatively ablated foam cylinder was then backlighted side-on by x-ray from a laser-irradiated Ti disk. By observing the transmission decrease due to the shock compression of the foam cylinder, the trajectories of shock front were measured, and from the onset of the intense thermal emission from the side of the cylinder, the propagations of the ionization front were also observed on the same shot. The experimental measurements were compared to predictions of the radiation hydrodynamics code Multi-1D and reasonable agreements were found.

Key words: ionization wave, shock wave, x-ray radiography

中图分类号: (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))

52.50.Jm

52.35.Tc (Shock waves and discontinuities) 28.52.Fa (Materials)

张继彦, 杨家敏, 江少恩, 李永升, 杨国洪, 丁耀南, 黄翼翔, 胡昕. Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation[J]. 中国物理B, 2010, 19(2): 25201-025201.

Zhang Ji-Yan(张继彦), Yang Jia-Min(杨家敏), Jiang Shao-En(江少恩), Li Yong-Sheng(李永升), Yang Guo-Hong(杨国洪), Ding Yao-Nan(丁耀南), Huang Yi-Xiang(黄翼翔), and Hu Xin(胡昕) . Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation[J]. Chin. Phys. B, 2010, 19(2): 25201-025201.

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Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation

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