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Title: Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA

Abstract

The effects of large-scale (with Legendre modes ≲10) laser-imposed nonuniformities in direct-drive cryogenic implosions on the OMEGA laser system are investigated using three-dimension hydrodynamic simulations performed using a newly developed code ASTER. Sources of these nonuniformities include an illumination pattern produced by 60 OMEGA laser beams, capsule offsets (~10 to 20 μm), and imperfect pointing, energy balance, and timing of the beams (with typical σrms ~10 μm, 10%, and 5 ps, respectively). Two implosion designs using 26-kJ triple-picket laser pulses were studied: a nominal design, in which a 880-μm-diameter capsule is illuminated by the same-diameter beams, and a “R75” design using a capsule of 900 μm in diameter and beams of 75% of this diameter. Simulations found that nonuniformities because of capsule offsets and beam imbalance have the largest effect on implosion performance. These nonuniformities lead to significant distortions of implosion cores resulting in an incomplete stagnation. The shape of distorted cores is well represented by neutron images, but loosely in x-rays. Simulated neutron spectra from perturbed implosions show large directional variations and up to ~ 2 keV variation of the hot spot temperature inferred from these spectra. The R75 design is more hydrodynamically efficient because of mitigation of crossed-beammore » energy transfer, but also suffers more from the nonuniformities. Furthermore, simulations predict a performance advantage of this design over the nominal design when the target offset and beam imbalance σrms are reduced to less than 5 μm and 5%, respectively.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1255555
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; 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; neutrons; hydrodynamics; x-ray imaging; cryogenic; shell model

Citation Formats

Igumenshchev, I. V., Goncharov, V. N., Marshall, F. J., Knauer, J. P., Campbell, E. M., Forrest, C. J., Froula, D. H., Glebov, V. Yu., McCrory, R. L., Regan, S. P., Sangster, T. C., Skupsky, S., and Stoeckl, C. Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA. United States: N. p., 2016. Web. doi:10.1063/1.4948418.
Igumenshchev, I. V., Goncharov, V. N., Marshall, F. J., Knauer, J. P., Campbell, E. M., Forrest, C. J., Froula, D. H., Glebov, V. Yu., McCrory, R. L., Regan, S. P., Sangster, T. C., Skupsky, S., & Stoeckl, C. Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA. United States. doi:10.1063/1.4948418.
Igumenshchev, I. V., Goncharov, V. N., Marshall, F. J., Knauer, J. P., Campbell, E. M., Forrest, C. J., Froula, D. H., Glebov, V. Yu., McCrory, R. L., Regan, S. P., Sangster, T. C., Skupsky, S., and Stoeckl, C. Wed . "Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA". United States. doi:10.1063/1.4948418. https://www.osti.gov/servlets/purl/1255555.
@article{osti_1255555,
title = {Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA},
author = {Igumenshchev, I. V. and Goncharov, V. N. and Marshall, F. J. and Knauer, J. P. and Campbell, E. M. and Forrest, C. J. and Froula, D. H. and Glebov, V. Yu. and McCrory, R. L. and Regan, S. P. and Sangster, T. C. and Skupsky, S. and Stoeckl, C.},
abstractNote = {The effects of large-scale (with Legendre modes ≲10) laser-imposed nonuniformities in direct-drive cryogenic implosions on the OMEGA laser system are investigated using three-dimension hydrodynamic simulations performed using a newly developed code ASTER. Sources of these nonuniformities include an illumination pattern produced by 60 OMEGA laser beams, capsule offsets (~10 to 20 μm), and imperfect pointing, energy balance, and timing of the beams (with typical σrms ~10 μm, 10%, and 5 ps, respectively). Two implosion designs using 26-kJ triple-picket laser pulses were studied: a nominal design, in which a 880-μm-diameter capsule is illuminated by the same-diameter beams, and a “R75” design using a capsule of 900 μm in diameter and beams of 75% of this diameter. Simulations found that nonuniformities because of capsule offsets and beam imbalance have the largest effect on implosion performance. These nonuniformities lead to significant distortions of implosion cores resulting in an incomplete stagnation. The shape of distorted cores is well represented by neutron images, but loosely in x-rays. Simulated neutron spectra from perturbed implosions show large directional variations and up to ~ 2 keV variation of the hot spot temperature inferred from these spectra. The R75 design is more hydrodynamically efficient because of mitigation of crossed-beam energy transfer, but also suffers more from the nonuniformities. Furthermore, simulations predict a performance advantage of this design over the nominal design when the target offset and beam imbalance σrms are reduced to less than 5 μm and 5%, respectively.},
doi = {10.1063/1.4948418},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}

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