Demonstartion of density dependence of x-ray flux in a laser-driven hohlraum

Experiments have been conducted using laser-driven cylindrical hohlraums whose walls are machined from Ta{sub 2}O{sub 5} foams of 100 mg/cc and 4 g/cc densities. Measurements of the radiation temperature demonstrate that the lower density walls produce higher radiation temperatures than the high den...

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Veröffentlicht in:Physical review letters 2008-02, Vol.101
Hauptverfasser: Young, P E, Rosen, M D, Hammer, J H, Hsing, W S, Glendinning, S G, Turner, R E, Kirkwood, R, Schein, J, Sorce, C, Satcher, J, Hamza, A, Reibold, R A, Hibbard, R, Landen, O, Reighard, A, McAlpin, S, Stevenson, M, Thomas, B
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container_title Physical review letters
container_volume 101
creator Young, P E
Rosen, M D
Hammer, J H
Hsing, W S
Glendinning, S G
Turner, R E
Kirkwood, R
Schein, J
Sorce, C
Satcher, J
Hamza, A
Reibold, R A
Hibbard, R
Landen, O
Reighard, A
McAlpin, S
Stevenson, M
Thomas, B
description Experiments have been conducted using laser-driven cylindrical hohlraums whose walls are machined from Ta{sub 2}O{sub 5} foams of 100 mg/cc and 4 g/cc densities. Measurements of the radiation temperature demonstrate that the lower density walls produce higher radiation temperatures than the high density walls. This is the first experimental demonstration of the prediction that this would occur [M. D. Rosen and J. H. Hammer, Phys. Rev. E 72, 056403 (2005)]. For high density walls, the radiation front propagates subsonically, and part of the absorbed energy is wasted by the flow kinetic energy. For the lower wall density, the front velocity is supersonic and can devote almost all of the absorbed energy to heating the wall.
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subjects 70 PLASMA PHYSICS AND FUSION
FORECASTING
HEATING
KINETIC ENERGY
RADIATIONS
VELOCITY
title Demonstartion of density dependence of x-ray flux in a laser-driven hohlraum
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