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Title: Moderate-convergence inertial confinement fusion implosions in tetrahedral hohlraums at Omega

Abstract

A highly uniform thermal x-radiation field for indirect-drive inertial confinement fusion implosions may be obtained by irradiating a four-hole, tetrahedral geometry, spherical hohlraum with all 60 Omega laser beams. Implosion studies and calculations [J. M. Wallace et al., Phys. Rev. Lett. 82, 3807 (1999)] indicate a drive uniformity comparable to that expected for the National Ignition Facility [J. A. Painser et al., Laser Focus World 30, 75 (1994)]. With 60 beams distributed over the cavity wall, tetrahedral hohlraums have a natural insensitivity to power balance and pointing errors. Standard, smooth Nova capsules imploded with this drive indicate that moderate convergence-ratio implosions, Cr{approx}18, have measured-neutron yield to calculated-clean-one-dimensional-neutronyield ratios similar to those previously investigated using the comparatively poor drive uniformity of Nova cylindrical hohlraums. This may indicate that a nonsymmetry-related neutron yield degradation mechanism, e.g., hydrodynamic mixing of cold, dense ablator material with the hot-spot region or some combination of nonsymmetry effects, is dominating in this Cr regime. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545-0001 (United States)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545-0001 (United States) (and others)
Publication Date:
OSTI Identifier:
20216550
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; OMEGA FACILITY; IMPLOSIONS; LASER TARGETS; X RADIATION; ICF DEVICES; INERTIAL CONFINEMENT; INDIRECT DRIVE LASER IMPLOSION; NEUTRON FLUX; NEUTRON EMISSION; NOVA FACILITY; HYDRODYNAMICS; SYMMETRY; PLASMA DIAGNOSTICS; LASER FUSION REACTORS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Bennett, G. R., Wallace, J. M., Murphy, T. J., Chrien, R. E., Delamater, N. D., Gobby, P. L., Hauer, A. A., Klare, K. A., Oertel, J. A., and Watt, R. G. Moderate-convergence inertial confinement fusion implosions in tetrahedral hohlraums at Omega. United States: N. p., 2000. Web. doi:10.1063/1.874101.
Bennett, G. R., Wallace, J. M., Murphy, T. J., Chrien, R. E., Delamater, N. D., Gobby, P. L., Hauer, A. A., Klare, K. A., Oertel, J. A., & Watt, R. G. Moderate-convergence inertial confinement fusion implosions in tetrahedral hohlraums at Omega. United States. doi:10.1063/1.874101.
Bennett, G. R., Wallace, J. M., Murphy, T. J., Chrien, R. E., Delamater, N. D., Gobby, P. L., Hauer, A. A., Klare, K. A., Oertel, J. A., and Watt, R. G. Thu . "Moderate-convergence inertial confinement fusion implosions in tetrahedral hohlraums at Omega". United States. doi:10.1063/1.874101.
@article{osti_20216550,
title = {Moderate-convergence inertial confinement fusion implosions in tetrahedral hohlraums at Omega},
author = {Bennett, G. R. and Wallace, J. M. and Murphy, T. J. and Chrien, R. E. and Delamater, N. D. and Gobby, P. L. and Hauer, A. A. and Klare, K. A. and Oertel, J. A. and Watt, R. G.},
abstractNote = {A highly uniform thermal x-radiation field for indirect-drive inertial confinement fusion implosions may be obtained by irradiating a four-hole, tetrahedral geometry, spherical hohlraum with all 60 Omega laser beams. Implosion studies and calculations [J. M. Wallace et al., Phys. Rev. Lett. 82, 3807 (1999)] indicate a drive uniformity comparable to that expected for the National Ignition Facility [J. A. Painser et al., Laser Focus World 30, 75 (1994)]. With 60 beams distributed over the cavity wall, tetrahedral hohlraums have a natural insensitivity to power balance and pointing errors. Standard, smooth Nova capsules imploded with this drive indicate that moderate convergence-ratio implosions, Cr{approx}18, have measured-neutron yield to calculated-clean-one-dimensional-neutronyield ratios similar to those previously investigated using the comparatively poor drive uniformity of Nova cylindrical hohlraums. This may indicate that a nonsymmetry-related neutron yield degradation mechanism, e.g., hydrodynamic mixing of cold, dense ablator material with the hot-spot region or some combination of nonsymmetry effects, is dominating in this Cr regime. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874101},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 7,
place = {United States},
year = {2000},
month = {6}
}