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Title: Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum

Abstract

A Dynamic Hohlraum (DH) is formed when arrays of tungsten wires driven by a high-current pulse implode and compress a cylindrical foam target. The resulting radiation is confined by the wire plasma and forms an intense, ~200–250 eV Planckian x-ray source. The internal radiation can be used for indirect drive inertial confinement fusion. The radiation emitted from the ends can be employed for radiation flow and material interaction studies. This external radiation is accompanied by an expanding blowoff plasma. In this paper, we have diagnosed this blowoff plasma using K-shell spectra of Mg tracer layers placed at the ends of some of the Dynamic Hohlraum targets. A similar diagnosis of the interior hohlraum has been carried out using Al and Mg tracers placed at 2mm depth from the ends. It is found that the blowoff plasma is about 20–25% as dense as that of the interior hohlraum, and that its presence does not significantly affect the outward flow of the nearly Planckian radiation field generated in the hohlraum interior. Finally, however, the electron temperature of the blowoff region, at ~120 eV, is only about half that of the interior hohlraum plasma.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [3]
  1. Naval Research Lab. (NRL), Washington, DC (United States). Plasma Physics Division
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1427013
Report Number(s):
SAND2007-0240J
Journal ID: ISSN 1070-664X; 638691
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 14; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; materials; disperse systems; metals; alkaline earth metals; Hohlraum; metallurgy; pure metals; transition metals; ionospheric physics; carbon

Citation Formats

Apruzese, J. P., Clark, R. W., Davis, J., Sanford, T. W. L., Nash, T. J., Mock, R. C., and Peterson, D. L. Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum. United States: N. p., 2007. Web. doi:10.1063/1.2718907.
Apruzese, J. P., Clark, R. W., Davis, J., Sanford, T. W. L., Nash, T. J., Mock, R. C., & Peterson, D. L. Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum. United States. doi:10.1063/1.2718907.
Apruzese, J. P., Clark, R. W., Davis, J., Sanford, T. W. L., Nash, T. J., Mock, R. C., and Peterson, D. L. Fri . "Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum". United States. doi:10.1063/1.2718907. https://www.osti.gov/servlets/purl/1427013.
@article{osti_1427013,
title = {Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum},
author = {Apruzese, J. P. and Clark, R. W. and Davis, J. and Sanford, T. W. L. and Nash, T. J. and Mock, R. C. and Peterson, D. L.},
abstractNote = {A Dynamic Hohlraum (DH) is formed when arrays of tungsten wires driven by a high-current pulse implode and compress a cylindrical foam target. The resulting radiation is confined by the wire plasma and forms an intense, ~200–250 eV Planckian x-ray source. The internal radiation can be used for indirect drive inertial confinement fusion. The radiation emitted from the ends can be employed for radiation flow and material interaction studies. This external radiation is accompanied by an expanding blowoff plasma. In this paper, we have diagnosed this blowoff plasma using K-shell spectra of Mg tracer layers placed at the ends of some of the Dynamic Hohlraum targets. A similar diagnosis of the interior hohlraum has been carried out using Al and Mg tracers placed at 2mm depth from the ends. It is found that the blowoff plasma is about 20–25% as dense as that of the interior hohlraum, and that its presence does not significantly affect the outward flow of the nearly Planckian radiation field generated in the hohlraum interior. Finally, however, the electron temperature of the blowoff region, at ~120 eV, is only about half that of the interior hohlraum plasma.},
doi = {10.1063/1.2718907},
journal = {Physics of Plasmas},
number = 4,
volume = 14,
place = {United States},
year = {Fri Apr 20 00:00:00 EDT 2007},
month = {Fri Apr 20 00:00:00 EDT 2007}
}

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