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Title: Diagnosing the plasma nonuniformity in an iron opacity experiment by spatially resolved Al 1s-2p absorption spectroscopy

Abstract

Generating a well-characterized hot-dense sample is of great importance to high quality opacity measurements. In this paper, we report on an experimental investigation of the plasma nonuniformity in a radiatively heated iron opacity sample by spatially resolved Al 1s-2p absorption spectroscopy. The iron sample was tamped by plastic at both sides and was heated by thermal x-ray radiation generated in a gold Hohlraum, and an Al layer attached to it was used as a tracer for temperature diagnosis. Spatially resolved 1s-2p transition absorption spectra of the Al tracer were measured by the technique of point-projection-spectroscopy, and temperatures in the sample were obtained by comparing the measured spectra with detailed-term-accounting model calculations, with the density of the sample deduced using a combination of side-on radiography and radiative hydrodynamic simulation. The results showed the existence of axial temperature nonuniformity in the sample, and these temperature variations have been used to explain the shift of iron 2p-3d transition absorption feature along the axial direction of the Hohlraum used to heat the sample successfully.

Authors:
 [1];  [2]; ; ; ; ;  [3]; ;  [1]
  1. CAS Key Laboratory of Basic Plasma Physics and Department of Modern Physics of University of Science and Technology of China, Hefei 230026 (China)
  2. (China)
  3. Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22072662
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 19; Journal Issue: 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; ALUMINIUM; GOLD; IRON; OPACITY; PLASMA; PLASTICS; TEMPERATURE MONITORING; X RADIATION

Citation Formats

Zhang Xiaoding, Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900, Zhang Jiyan, Zhao Yang, Xiong Gang, Yang Guohong, Yang Jiamin, Zhao Bin, and Zheng Jian. Diagnosing the plasma nonuniformity in an iron opacity experiment by spatially resolved Al 1s-2p absorption spectroscopy. United States: N. p., 2012. Web. doi:10.1063/1.4772767.
Zhang Xiaoding, Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900, Zhang Jiyan, Zhao Yang, Xiong Gang, Yang Guohong, Yang Jiamin, Zhao Bin, & Zheng Jian. Diagnosing the plasma nonuniformity in an iron opacity experiment by spatially resolved Al 1s-2p absorption spectroscopy. United States. doi:10.1063/1.4772767.
Zhang Xiaoding, Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900, Zhang Jiyan, Zhao Yang, Xiong Gang, Yang Guohong, Yang Jiamin, Zhao Bin, and Zheng Jian. Sat . "Diagnosing the plasma nonuniformity in an iron opacity experiment by spatially resolved Al 1s-2p absorption spectroscopy". United States. doi:10.1063/1.4772767.
@article{osti_22072662,
title = {Diagnosing the plasma nonuniformity in an iron opacity experiment by spatially resolved Al 1s-2p absorption spectroscopy},
author = {Zhang Xiaoding and Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900 and Zhang Jiyan and Zhao Yang and Xiong Gang and Yang Guohong and Yang Jiamin and Zhao Bin and Zheng Jian},
abstractNote = {Generating a well-characterized hot-dense sample is of great importance to high quality opacity measurements. In this paper, we report on an experimental investigation of the plasma nonuniformity in a radiatively heated iron opacity sample by spatially resolved Al 1s-2p absorption spectroscopy. The iron sample was tamped by plastic at both sides and was heated by thermal x-ray radiation generated in a gold Hohlraum, and an Al layer attached to it was used as a tracer for temperature diagnosis. Spatially resolved 1s-2p transition absorption spectra of the Al tracer were measured by the technique of point-projection-spectroscopy, and temperatures in the sample were obtained by comparing the measured spectra with detailed-term-accounting model calculations, with the density of the sample deduced using a combination of side-on radiography and radiative hydrodynamic simulation. The results showed the existence of axial temperature nonuniformity in the sample, and these temperature variations have been used to explain the shift of iron 2p-3d transition absorption feature along the axial direction of the Hohlraum used to heat the sample successfully.},
doi = {10.1063/1.4772767},
journal = {Physics of Plasmas},
number = 12,
volume = 19,
place = {United States},
year = {Sat Dec 15 00:00:00 EST 2012},
month = {Sat Dec 15 00:00:00 EST 2012}
}