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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];  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545-0001 (United States)
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. https://doi.org/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. https://doi.org/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},
url = {https://www.osti.gov/biblio/20216550}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 7,
place = {United States},
year = {2000},
month = {6}
}