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Title: Tent-induced perturbations on areal density of implosions at the National Ignition Facility

Abstract

Areal density non-uniformities seeded by time-dependent drive variations and target imperfections in Inertial Confinement Fusion (ICF) targets can grow in time as the capsule implodes, with growth rates that are amplified by instabilities. Here, we report on the first measurements of the perturbations on the density and areal density profiles induced by the membranes used to hold the capsule within the hohlraum in indirect drive ICF targets. The measurements are based on the reconstruction of the ablator density profiles from 2D radiographs obtained using pinhole imaging coupled to area backlighting, as close as 150 ps to peak compression. Our study shows a clear correlation between the modulations imposed on the areal density and measured neutron yield, and a 3× reduction in the areal density perturbations comparing a high-adiabat vs. low-adiabat pulse shape.

Authors:
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  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22410411
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; 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; COMPRESSION; DENSITY; DISTURBANCES; IMPLOSIONS; INDIRECT DRIVE ICF; INERTIAL CONFINEMENT; NEUTRONS; PLASMA INSTABILITY; PULSE SHAPERS; TIME DEPENDENCE; US NATIONAL IGNITION FACILITY

Citation Formats

Tommasini, R., E-mail: tommasini2@llnl.gov, Field, J. E., Hammel, B. A., Landen, O. L., Haan, S. W., Aracne-Ruddle, C., Benedetti, L. R., Bradley, D. K., Callahan, D. A., Dewald, E. L., Doeppner, T., Edwards, M. J., Hurricane, O. A., Izumi, N., Jones, O. A., Ma, T., Meezan, N. B., Nagel, S. R., Rygg, J. R., Stadermann, M., and and others. Tent-induced perturbations on areal density of implosions at the National Ignition Facility. United States: N. p., 2015. Web. doi:10.1063/1.4921218.
Tommasini, R., E-mail: tommasini2@llnl.gov, Field, J. E., Hammel, B. A., Landen, O. L., Haan, S. W., Aracne-Ruddle, C., Benedetti, L. R., Bradley, D. K., Callahan, D. A., Dewald, E. L., Doeppner, T., Edwards, M. J., Hurricane, O. A., Izumi, N., Jones, O. A., Ma, T., Meezan, N. B., Nagel, S. R., Rygg, J. R., Stadermann, M., & and others. Tent-induced perturbations on areal density of implosions at the National Ignition Facility. United States. doi:10.1063/1.4921218.
Tommasini, R., E-mail: tommasini2@llnl.gov, Field, J. E., Hammel, B. A., Landen, O. L., Haan, S. W., Aracne-Ruddle, C., Benedetti, L. R., Bradley, D. K., Callahan, D. A., Dewald, E. L., Doeppner, T., Edwards, M. J., Hurricane, O. A., Izumi, N., Jones, O. A., Ma, T., Meezan, N. B., Nagel, S. R., Rygg, J. R., Stadermann, M., and and others. Fri . "Tent-induced perturbations on areal density of implosions at the National Ignition Facility". United States. doi:10.1063/1.4921218.
@article{osti_22410411,
title = {Tent-induced perturbations on areal density of implosions at the National Ignition Facility},
author = {Tommasini, R., E-mail: tommasini2@llnl.gov and Field, J. E. and Hammel, B. A. and Landen, O. L. and Haan, S. W. and Aracne-Ruddle, C. and Benedetti, L. R. and Bradley, D. K. and Callahan, D. A. and Dewald, E. L. and Doeppner, T. and Edwards, M. J. and Hurricane, O. A. and Izumi, N. and Jones, O. A. and Ma, T. and Meezan, N. B. and Nagel, S. R. and Rygg, J. R. and Stadermann, M. and and others},
abstractNote = {Areal density non-uniformities seeded by time-dependent drive variations and target imperfections in Inertial Confinement Fusion (ICF) targets can grow in time as the capsule implodes, with growth rates that are amplified by instabilities. Here, we report on the first measurements of the perturbations on the density and areal density profiles induced by the membranes used to hold the capsule within the hohlraum in indirect drive ICF targets. The measurements are based on the reconstruction of the ablator density profiles from 2D radiographs obtained using pinhole imaging coupled to area backlighting, as close as 150 ps to peak compression. Our study shows a clear correlation between the modulations imposed on the areal density and measured neutron yield, and a 3× reduction in the areal density perturbations comparing a high-adiabat vs. low-adiabat pulse shape.},
doi = {10.1063/1.4921218},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}