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

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

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.

Keywords: ionization wave shock wave x-ray radiography

Received: 01 May 2009
Revised: 21 May 2009
Accepted manuscript online:

PACS:	52.50.Jm	(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
	52.35.Tc	(Shock waves and discontinuities)
	28.52.Fa	(Materials)

Fund: Project supported by the Science and Technology Fund of the China Academy of Engineering Physics (Grant No. 2007B08003).

Cite this article:

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 2010 Chin. Phys. B 19 025201

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

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