Experimental observation of ionization and shock fronts in foam targets driven by thermal radiation |
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Authors: | Zhang Ji-Yan Yang Jia-Min Jiang Shao-En Li Yong-Sheng Yang Guo-Hong Ding Yao-Nan Huang Yi-Xiang and Hu Xin |
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Institution: | Research Centre of Laser Fusion, P. O. Box 919-986, Mianyang 621900, China; Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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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. |
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Keywords: | ionization wave shock wave x-ray radiography |
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