Diffusive, supersonic x-ray transport in radiatively heated foam cylinders

被引：70

作者：

Back, CA ^{[1
]}

Bauer, JD ^{[1
]}

Hammer, JH ^{[1
]}

Lasinski, BF ^{[1
]}

Turner, RE ^{[1
]}

Rambo, PW ^{[1
]}

Landen, OL ^{[1
]}

Suter, LJ ^{[1
]}

Rosen, MD ^{[1
]}

Hsing, WW ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

PHYSICS OF PLASMAS | 2000年 / 7卷 / 05期

关键词：

D O I：

10.1063/1.874057

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Diffusive supersonic radiation transport, where the ratio of the diffusive radiation front velocity to the material sound speed > 2 has been studied in experiments on low density (40 mg/cc to 50 mg/cc) foams. Laser-heated Au hohlraums provided a radiation drive that heated SiO2 and Ta2O5 aerogel foams of varying lengths. Face-on emission measurements at 550 eV provided clean signatures of the radiation breakout. The high quality data provides new detailed information on the importance of both the fill and wall material opacities and heat capacities in determining the radiation front speed and curvature. The Marshak radiation wave transport is studied in a geometry that allows direct comparisons with analytic models and two-dimensional code simulations. Experiments show important effects that will affect even nondiffusive and transonic radiation transport experiments studied by others in the field. This work is of basic science interest with applications to inertial confinement fusion and astrophysics. [S1070-664X(00)97405-6].

引用

页码：2126 / 2134

页数：9

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[1] SUPERSONIC PROPAGATION OF AN IONIZATION FRONT IN LOW-DENSITY FOAM TARGETS DRIVEN BY THERMAL-RADIATION [J].