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Title: Dynamic hohlraum radiation hydrodynamics

Abstract

Z-pinch dynamic hohlraums are a promising indirect-drive inertial confinement fusion approach. Comparison of multiple experimental methods with integrated Z-pinch/hohlraum/capsule computer simulations builds understanding of the hohlraum interior conditions. Time-resolved x-ray images determine the motion of the radiating shock that heats the hohlraum as it propagates toward the hohlraum axis. The images also measure the radius of radiation-driven capsules as they implode. Dynamic hohlraum LASNEX [G. Zimmerman and W. Kruer, Comments Plasma Phys. Control. Fusion 2, 85 (1975)] simulations are found to overpredict the shock velocity by {approx}20-40%, but simulated capsule implosion trajectories agree reasonably well with the data. Measurements of the capsule implosion core conditions using time- and space-resolved Ar tracer x-ray spectroscopy and the fusion neutron yield provide additional tests of the integrated hohlraum-implosion system understanding. The neutron yield in the highest performing CH capsule implosions is {approx}20-30% of the yield calculated with unperturbed 2D LASNEX simulations. The emissivity-averaged electron temperature and density peak at approximately 900 eV and 4x10{sup 23} cm{sup -3}, respectively. Synthetic spectra produced by postprocessing 1D LASNEX capsule implosion simulations possess spectral features from H-like and He-like Ar that are similar in duration to the measured spectra. However, the simulation emissivity-averaged density peaks at amore » value that is four times lower than the experiment, while the temperature is approximately 1.6 times higher. The agreement with the capsule trajectory measurements and the ability to design capsule implosions that routinely produce implosion cores hot and dense enough to emit fusion neutrons and Ar spectra are evidence for a respectable degree of dynamic hohlraum understanding. The hohlraum shock velocity and implosion core discrepancies imply that calculations of the hohlraum radiation driving capsule implosions require further refinement.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ;  [2]; ; ;  [3];  [4]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185-1196 (United States)
  2. University of Nevada, Reno, Nevada 89557 (United States)
  3. K-tech Corporation, Albuquerque, New Mexico 87185 (United States)
  4. Prism Computational Sciences, Madison, Wisconsin 53703 (United States)
Publication Date:
OSTI Identifier:
20783149
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 13; Journal Issue: 5; Other Information: DOI: 10.1063/1.2177640; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; ELECTRON TEMPERATURE; EMISSIVITY; EV RANGE; HYDRODYNAMICS; ICF DEVICES; IMPLOSIONS; INERTIAL CONFINEMENT; ION TEMPERATURE; NEUTRONS; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA SIMULATION; SHOCK WAVES; TIME RESOLUTION; X RADIATION; X-RAY SPECTROSCOPY

Citation Formats

Bailey, J E, Chandler, G A, Slutz, S A, Rochau, G A, Cooper, G, Lake, P W, Leeper, R J, Lemke, R, Mehlhorn, T A, Nash, T J, Nielsen, D S, Peterson, K L, Ruiz, C L, Varnum, W, Mancini, R C, Buris-Mog, T J, Bump, M, Dunham, G, Moore, T C, and Golovkin, I. Dynamic hohlraum radiation hydrodynamics. United States: N. p., 2006. Web. doi:10.1063/1.2177640.
Bailey, J E, Chandler, G A, Slutz, S A, Rochau, G A, Cooper, G, Lake, P W, Leeper, R J, Lemke, R, Mehlhorn, T A, Nash, T J, Nielsen, D S, Peterson, K L, Ruiz, C L, Varnum, W, Mancini, R C, Buris-Mog, T J, Bump, M, Dunham, G, Moore, T C, & Golovkin, I. Dynamic hohlraum radiation hydrodynamics. United States. doi:10.1063/1.2177640.
Bailey, J E, Chandler, G A, Slutz, S A, Rochau, G A, Cooper, G, Lake, P W, Leeper, R J, Lemke, R, Mehlhorn, T A, Nash, T J, Nielsen, D S, Peterson, K L, Ruiz, C L, Varnum, W, Mancini, R C, Buris-Mog, T J, Bump, M, Dunham, G, Moore, T C, and Golovkin, I. Mon . "Dynamic hohlraum radiation hydrodynamics". United States. doi:10.1063/1.2177640.
@article{osti_20783149,
title = {Dynamic hohlraum radiation hydrodynamics},
author = {Bailey, J E and Chandler, G A and Slutz, S A and Rochau, G A and Cooper, G and Lake, P W and Leeper, R J and Lemke, R and Mehlhorn, T A and Nash, T J and Nielsen, D S and Peterson, K L and Ruiz, C L and Varnum, W and Mancini, R C and Buris-Mog, T J and Bump, M and Dunham, G and Moore, T C and Golovkin, I},
abstractNote = {Z-pinch dynamic hohlraums are a promising indirect-drive inertial confinement fusion approach. Comparison of multiple experimental methods with integrated Z-pinch/hohlraum/capsule computer simulations builds understanding of the hohlraum interior conditions. Time-resolved x-ray images determine the motion of the radiating shock that heats the hohlraum as it propagates toward the hohlraum axis. The images also measure the radius of radiation-driven capsules as they implode. Dynamic hohlraum LASNEX [G. Zimmerman and W. Kruer, Comments Plasma Phys. Control. Fusion 2, 85 (1975)] simulations are found to overpredict the shock velocity by {approx}20-40%, but simulated capsule implosion trajectories agree reasonably well with the data. Measurements of the capsule implosion core conditions using time- and space-resolved Ar tracer x-ray spectroscopy and the fusion neutron yield provide additional tests of the integrated hohlraum-implosion system understanding. The neutron yield in the highest performing CH capsule implosions is {approx}20-30% of the yield calculated with unperturbed 2D LASNEX simulations. The emissivity-averaged electron temperature and density peak at approximately 900 eV and 4x10{sup 23} cm{sup -3}, respectively. Synthetic spectra produced by postprocessing 1D LASNEX capsule implosion simulations possess spectral features from H-like and He-like Ar that are similar in duration to the measured spectra. However, the simulation emissivity-averaged density peaks at a value that is four times lower than the experiment, while the temperature is approximately 1.6 times higher. The agreement with the capsule trajectory measurements and the ability to design capsule implosions that routinely produce implosion cores hot and dense enough to emit fusion neutrons and Ar spectra are evidence for a respectable degree of dynamic hohlraum understanding. The hohlraum shock velocity and implosion core discrepancies imply that calculations of the hohlraum radiation driving capsule implosions require further refinement.},
doi = {10.1063/1.2177640},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 13,
place = {United States},
year = {2006},
month = {5}
}