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Title: Polar-direct-drive experiments on the National Ignition Facility

Abstract

To support direct-drive inertial confinement fusion experiments at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)] in its indirect-drive beam configuration, the polar-direct-drive (PDD) concept [S. Skupsky et al., Phys. Plasmas 11, 2763 (2004)] has been proposed. Ignition in PDD geometry requires direct-drive–specific beam smoothing, phase plates, and repointing the NIF beams toward the equator to ensure symmetric target irradiation. First experiments to study the energetics and preheat in PDD implosions at the NIF have been performed. These experiments utilize the NIF in its current configuration, including beam geometry, phase plates, and beam smoothing. Room-temperature, 2.2-mm-diam plastic shells filled with D{sub 2} gas were imploded with total drive energies ranging from ∼500 to 750 kJ with peak powers of 120 to 180 TW and peak on-target irradiances at the initial target radius from 8 × 10{sup 14} to 1.2 × 10{sup 15 }W/cm{sup 2}. Results from these initial experiments are presented, including measurements of shell trajectory, implosion symmetry, and the level of hot-electron preheat in plastic and Si ablators. Experiments are simulated with the 2-D hydrodynamics code DRACO including a full 3-D ray-trace to model oblique beams, and models for nonlocal electron transport andmore » cross-beam energy transport (CBET). These simulations indicate that CBET affects the shell symmetry and leads to a loss of energy imparted onto the shell, consistent with the experimental data.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »; « less
  1. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299 (United States)
Publication Date:
OSTI Identifier:
22410404
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; BEAM PROFILES; DEUTERIUM; DIRECT CURRENT; ELECTRON BEAM TARGETS; ELECTRON TRANSFER; ENERGY TRANSFER; EXPERIMENTAL DATA; HYDRODYNAMICS; IMPLOSIONS; INERTIAL CONFINEMENT; PEAK LOAD; PLASTICS; SILICON; SIMULATION; SYMMETRY; TEMPERATURE RANGE 0273-0400 K; US NATIONAL IGNITION FACILITY

Citation Formats

Hohenberger, M., Radha, P. B., Myatt, J. F., Marozas, J. A., Marshall, F. J., Michel, D. T., Regan, S. P., Seka, W., Shvydky, A., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Fiksel, G., Froula, D. H., and and others. Polar-direct-drive experiments on the National Ignition Facility. United States: N. p., 2015. Web. doi:10.1063/1.4920958.
Hohenberger, M., Radha, P. B., Myatt, J. F., Marozas, J. A., Marshall, F. J., Michel, D. T., Regan, S. P., Seka, W., Shvydky, A., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Fiksel, G., Froula, D. H., & and others. Polar-direct-drive experiments on the National Ignition Facility. United States. doi:10.1063/1.4920958.
Hohenberger, M., Radha, P. B., Myatt, J. F., Marozas, J. A., Marshall, F. J., Michel, D. T., Regan, S. P., Seka, W., Shvydky, A., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Fiksel, G., Froula, D. H., and and others. Fri . "Polar-direct-drive experiments on the National Ignition Facility". United States. doi:10.1063/1.4920958.
@article{osti_22410404,
title = {Polar-direct-drive experiments on the National Ignition Facility},
author = {Hohenberger, M. and Radha, P. B. and Myatt, J. F. and Marozas, J. A. and Marshall, F. J. and Michel, D. T. and Regan, S. P. and Seka, W. and Shvydky, A. and Sangster, T. C. and Betti, R. and Boehly, T. R. and Bonino, M. J. and Collins, T. J. B. and Craxton, R. S. and Delettrez, J. A. and Edgell, D. H. and Epstein, R. and Fiksel, G. and Froula, D. H. and and others},
abstractNote = {To support direct-drive inertial confinement fusion experiments at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)] in its indirect-drive beam configuration, the polar-direct-drive (PDD) concept [S. Skupsky et al., Phys. Plasmas 11, 2763 (2004)] has been proposed. Ignition in PDD geometry requires direct-drive–specific beam smoothing, phase plates, and repointing the NIF beams toward the equator to ensure symmetric target irradiation. First experiments to study the energetics and preheat in PDD implosions at the NIF have been performed. These experiments utilize the NIF in its current configuration, including beam geometry, phase plates, and beam smoothing. Room-temperature, 2.2-mm-diam plastic shells filled with D{sub 2} gas were imploded with total drive energies ranging from ∼500 to 750 kJ with peak powers of 120 to 180 TW and peak on-target irradiances at the initial target radius from 8 × 10{sup 14} to 1.2 × 10{sup 15 }W/cm{sup 2}. Results from these initial experiments are presented, including measurements of shell trajectory, implosion symmetry, and the level of hot-electron preheat in plastic and Si ablators. Experiments are simulated with the 2-D hydrodynamics code DRACO including a full 3-D ray-trace to model oblique beams, and models for nonlocal electron transport and cross-beam energy transport (CBET). These simulations indicate that CBET affects the shell symmetry and leads to a loss of energy imparted onto the shell, consistent with the experimental data.},
doi = {10.1063/1.4920958},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}