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Title: Time- and space-resolved spectroscopy of dynamic hohlraum interiors.

Abstract

A dynamic hohlraum is created when an annular z-pinch plasma implodes onto a cylindrical 0.014 g/cc 6-mm-diameter CH{sub 2} foam. The impact launches a radiating shock that propagates toward the axis at {approx}350 {micro}m/ns. The radiation trapped by the tungsten z-pinch plasma forms a {approx}200 eV hohlraum that provides X-rays for indirect drive inertial confinement fusion capsule implosion experiments. We are developing the ability to diagnose the hohlraum interior using emission and absorption spectroscopy of Si atoms added as a tracer to the central portion of the foam. Time- and space-resolved Si spectra are recorded with an elliptical crystal spectrometer viewing the cylindrical hohlraum end-on. A rectangular aperture at the end of the hohlraum restricts the field of view so that the 1D spectrometer resolution corresponds approximately to the hohlraum radial direction. This enables distinguishing between spectra from the unshocked radiation-heated foam and from the shocked foam. Typical spectral lines observed include the Si Ly{alpha} with its He-like satellites and the He-like resonance sequence including He{alpha}, He{beta}, and He{gamma}, along with some of their associated Li-like satellites. Work is in progress to infer the hohlraum conditions using collisional-radiative modeling that accounts for the radiation environment and includes both opacity effectsmore » and detailed Stark broadening calculations. These 6-mm-scale radiation-heated plasmas might eventually also prove suitable for testing Stark broadening line profile calculations or for opacity measurements.« less

Authors:
 [1];  [2]; ;  [1]; ;  [3];  [4];  [2];  [2];  [4]; ; ;  [3]; ;
  1. Weizmann Institute of Science, Rehovot, Israel
  2. K-Tech Corporation, Albuquerque, NM
  3. Prism Computational Science, Madison, WI
  4. Schafer, Corporation, Livermore, CA
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
952144
Report Number(s):
SAND2005-0647J
TRN: US0902397
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Proposed for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer.
Additional Journal Information:
Journal Name: Proposed for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION SPECTROSCOPY; APERTURES; ATOMS; IMPLOSIONS; INERTIAL CONFINEMENT; OPACITY; RADIATIONS; RESOLUTION; RESONANCE; SATELLITES; SPECTRA; SPECTROMETERS; SPECTROSCOPY; TESTING; TUNGSTEN

Citation Formats

Maron, Yitzhak, Dunham, Gregory Sham, Lemke, Raymond William, Stambulchik, E, Chandler, Gordon Andrew, MacFarlane, Joseph John, Schroen, Diana Grace, Lucas, J M, Moore, Tracy Croft, Youngblood, K, Bailey, James E, Lake, Patrick Wayne, Golovkin, I E, Mehlhorn, Thomas Alan, and Slutz, Stephen A. Time- and space-resolved spectroscopy of dynamic hohlraum interiors.. United States: N. p., 2005. Web.
Maron, Yitzhak, Dunham, Gregory Sham, Lemke, Raymond William, Stambulchik, E, Chandler, Gordon Andrew, MacFarlane, Joseph John, Schroen, Diana Grace, Lucas, J M, Moore, Tracy Croft, Youngblood, K, Bailey, James E, Lake, Patrick Wayne, Golovkin, I E, Mehlhorn, Thomas Alan, & Slutz, Stephen A. Time- and space-resolved spectroscopy of dynamic hohlraum interiors.. United States.
Maron, Yitzhak, Dunham, Gregory Sham, Lemke, Raymond William, Stambulchik, E, Chandler, Gordon Andrew, MacFarlane, Joseph John, Schroen, Diana Grace, Lucas, J M, Moore, Tracy Croft, Youngblood, K, Bailey, James E, Lake, Patrick Wayne, Golovkin, I E, Mehlhorn, Thomas Alan, and Slutz, Stephen A. 2005. "Time- and space-resolved spectroscopy of dynamic hohlraum interiors.". United States.
@article{osti_952144,
title = {Time- and space-resolved spectroscopy of dynamic hohlraum interiors.},
author = {Maron, Yitzhak and Dunham, Gregory Sham and Lemke, Raymond William and Stambulchik, E and Chandler, Gordon Andrew and MacFarlane, Joseph John and Schroen, Diana Grace and Lucas, J M and Moore, Tracy Croft and Youngblood, K and Bailey, James E and Lake, Patrick Wayne and Golovkin, I E and Mehlhorn, Thomas Alan and Slutz, Stephen A},
abstractNote = {A dynamic hohlraum is created when an annular z-pinch plasma implodes onto a cylindrical 0.014 g/cc 6-mm-diameter CH{sub 2} foam. The impact launches a radiating shock that propagates toward the axis at {approx}350 {micro}m/ns. The radiation trapped by the tungsten z-pinch plasma forms a {approx}200 eV hohlraum that provides X-rays for indirect drive inertial confinement fusion capsule implosion experiments. We are developing the ability to diagnose the hohlraum interior using emission and absorption spectroscopy of Si atoms added as a tracer to the central portion of the foam. Time- and space-resolved Si spectra are recorded with an elliptical crystal spectrometer viewing the cylindrical hohlraum end-on. A rectangular aperture at the end of the hohlraum restricts the field of view so that the 1D spectrometer resolution corresponds approximately to the hohlraum radial direction. This enables distinguishing between spectra from the unshocked radiation-heated foam and from the shocked foam. Typical spectral lines observed include the Si Ly{alpha} with its He-like satellites and the He-like resonance sequence including He{alpha}, He{beta}, and He{gamma}, along with some of their associated Li-like satellites. Work is in progress to infer the hohlraum conditions using collisional-radiative modeling that accounts for the radiation environment and includes both opacity effects and detailed Stark broadening calculations. These 6-mm-scale radiation-heated plasmas might eventually also prove suitable for testing Stark broadening line profile calculations or for opacity measurements.},
doi = {},
url = {https://www.osti.gov/biblio/952144}, journal = {Proposed for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer.},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2005},
month = {Sat Jan 01 00:00:00 EST 2005}
}