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Proceedings Paper

Dependence of soft x-ray conversion on atomic composition in laser-produced plasma of copper-gold mix-Z targets
Author(s): Prasad A. Naik; Juzer A. Chakera; Vipul Arora; Narendra K. Gupta; Sivaraman Sailaja; Sudhakar R. Kumbhare; Parshotam Dass Gupta; Buddhi K. Godwal
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Paper Abstract

In the indirect scheme of ICF, a high-Z ablator is used as the inside wall material of the hohlraum cavity. This choice is made because a high-Z plasma is an efficient x-ray convertor, and it offers a high opacity to radiation conduction into the cavity wall. Recently it had been shown that a mixture of two or more high-Z elements can provide a higher opacity than that of any single materials used, and optimum composition was predicted from computer simulations. It is expected that such a wall will provide maximum conversion of absorbed laser energy into soft x-ray radiation. In this paper, we present a comparative experimental study of soft x-ray emission from copper-gold mix-Z planar targets of different atomic compositions irradiated at a laser intensity of ~1013 W/cm2 (λ = 0.532μm). Spectral features of the soft x-ray radiation were recorded using a transmission grating spectrograph. Maximum enhancement in radiation intensity in the spectral region ~ 40 - 120 Å was observed for a mix-Z target of atomic composition of Cu 0.57 - Au 0.43. This is in broad agreement with theoretical results of opacity calculations performed for different atomic compositions using a screened hydrogenic average atom model.

Paper Details

Date Published: 12 December 2003
PDF: 5 pages
Proc. SPIE 5228, ECLIM 2002: 27th European Conference on Laser Interaction with Matter, (12 December 2003); doi: 10.1117/12.534265
Show Author Affiliations
Prasad A. Naik, Ctr. for Advanced Technology (India)
Juzer A. Chakera, Ctr. for Advanced Technology (India)
Vipul Arora, Ctr. for Advanced Technology (India)
Narendra K. Gupta, Bhabha Atomic Research Ctr. (India)
Sivaraman Sailaja, Ctr. for Advanced Technology (India)
Sudhakar R. Kumbhare, Ctr. for Advanced Technology (India)
Parshotam Dass Gupta, Ctr. for Advanced Technology (India)
Buddhi K. Godwal, Bhabha Atomic Research Ctr. (India)

Published in SPIE Proceedings Vol. 5228:
ECLIM 2002: 27th European Conference on Laser Interaction with Matter
Oleg N. Krokhin; Sergey Yu. Gus'kov; Yury A. Merkul'ev, Editor(s)

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