skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Three-dimensional hydrodynamic simulations of OMEGA implosions

Abstract

Here, the effects of large-scale (with Legendre modes ≲10) asymmetries in OMEGA direct-drive implosions caused by laser illumination nonuniformities (beam-power imbalance and beam mispointing and mistiming), target offset, and variation in target-layer thickness were investigated using the low-noise, three-dimensional Eulerian hydrodynamic code ASTER. Simulations indicate that these asymmetries can significantly degrade the implosion performance. The most important sources of the asymmetries are the target offsets (~10 to 20 μm), beam-power imbalance (σ rms ~ 10%), and variations (~5%) in target-layer thickness. Large-scale asymmetries distort implosion cores, resulting in a reduced hot-spot confinement and an increased residual kinetic energy of implosion targets. The ion temperature inferred from the width of simulated neutron spectra is influenced by bulk fuel motion in the distorted hot spot and can result in up to an ~1 -keV increase in apparent temperature. Similar temperature variations along different lines of sight are observed. Demonstrating hydrodynamic equivalence to ignition designs on OMEGA requires a reduction in large-scale target and laser-imposed nonuniformities, minimizing target offset, and employing highly efficient mid-adiabat (α = 4) implosion designs, which mitigate cross-beam energy transfer and suppress short-wavelength Rayleigh–Taylor growth.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [3]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Naval Research Lab., Washington, D.C. (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1351534
Alternate Identifier(s):
OSTI ID: 1373964
Report Number(s):
2016-114; 1329
Journal ID: ISSN 1070-664X; 2016-114, 2284, 1329; TRN: US1700567
Grant/Contract Number:  
NA0001944
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Igumenshchev, I. V., Michel, D. T., Shah, R. C., Campbell, E. M., Epstein, R., Forrest, C. J., Glebov, V. Yu., Goncharov, V. N., Knauer, J. P., Marshall, F. J., McCrory, R. L., Regan, S. P., Sangster, T. C., Stoeckl, C., Schmitt, A. J., and Obenschain, S. Three-dimensional hydrodynamic simulations of OMEGA implosions. United States: N. p., 2017. Web. doi:10.1063/1.4979195.
Igumenshchev, I. V., Michel, D. T., Shah, R. C., Campbell, E. M., Epstein, R., Forrest, C. J., Glebov, V. Yu., Goncharov, V. N., Knauer, J. P., Marshall, F. J., McCrory, R. L., Regan, S. P., Sangster, T. C., Stoeckl, C., Schmitt, A. J., & Obenschain, S. Three-dimensional hydrodynamic simulations of OMEGA implosions. United States. doi:10.1063/1.4979195.
Igumenshchev, I. V., Michel, D. T., Shah, R. C., Campbell, E. M., Epstein, R., Forrest, C. J., Glebov, V. Yu., Goncharov, V. N., Knauer, J. P., Marshall, F. J., McCrory, R. L., Regan, S. P., Sangster, T. C., Stoeckl, C., Schmitt, A. J., and Obenschain, S. Thu . "Three-dimensional hydrodynamic simulations of OMEGA implosions". United States. doi:10.1063/1.4979195. https://www.osti.gov/servlets/purl/1351534.
@article{osti_1351534,
title = {Three-dimensional hydrodynamic simulations of OMEGA implosions},
author = {Igumenshchev, I. V. and Michel, D. T. and Shah, R. C. and Campbell, E. M. and Epstein, R. and Forrest, C. J. and Glebov, V. Yu. and Goncharov, V. N. and Knauer, J. P. and Marshall, F. J. and McCrory, R. L. and Regan, S. P. and Sangster, T. C. and Stoeckl, C. and Schmitt, A. J. and Obenschain, S.},
abstractNote = {Here, the effects of large-scale (with Legendre modes ≲10) asymmetries in OMEGA direct-drive implosions caused by laser illumination nonuniformities (beam-power imbalance and beam mispointing and mistiming), target offset, and variation in target-layer thickness were investigated using the low-noise, three-dimensional Eulerian hydrodynamic code ASTER. Simulations indicate that these asymmetries can significantly degrade the implosion performance. The most important sources of the asymmetries are the target offsets (~10 to 20 μm), beam-power imbalance (σrms ~ 10%), and variations (~5%) in target-layer thickness. Large-scale asymmetries distort implosion cores, resulting in a reduced hot-spot confinement and an increased residual kinetic energy of implosion targets. The ion temperature inferred from the width of simulated neutron spectra is influenced by bulk fuel motion in the distorted hot spot and can result in up to an ~1 -keV increase in apparent temperature. Similar temperature variations along different lines of sight are observed. Demonstrating hydrodynamic equivalence to ignition designs on OMEGA requires a reduction in large-scale target and laser-imposed nonuniformities, minimizing target offset, and employing highly efficient mid-adiabat (α = 4) implosion designs, which mitigate cross-beam energy transfer and suppress short-wavelength Rayleigh–Taylor growth.},
doi = {10.1063/1.4979195},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Thu Mar 30 00:00:00 EDT 2017},
month = {Thu Mar 30 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: