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Title: Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics

Abstract

The effects of laser-plasma interactions (LPI) on the dynamics of inertial confinement fusion hohlraums are investigated in this work via a new approach that self-consistently couples reduced LPI models into radiation-hydrodynamics numerical codes. The interplay between hydrodynamics and LPI—specifically stimulated Raman scatter and crossed-beam energy transfer (CBET)—mostly occurs via momentum and energy deposition into Langmuir and ion acoustic waves. This spatially redistributes energy coupling to the target, which affects the background plasma conditions and thus, modifies laser propagation. In conclusion, this model shows reduced CBET and significant laser energy depletion by Langmuir waves, which reduce the discrepancy between modeling and data from hohlraum experiments on wall x-ray emission and capsule implosion shape.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1341948
Alternate Identifier(s):
OSTI ID: 1339187
Report Number(s):
LLNL-JRNL-696918
Journal ID: ISSN 0031-9007; TRN: US1700993
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Strozzi, D. J., Bailey, D. S., Michel, P., Divol, L., Sepke, S. M., Kerbel, G. D., Thomas, C. A., Ralph, J. E., Moody, J. D., and Schneider, M. B.. Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.025002.
Strozzi, D. J., Bailey, D. S., Michel, P., Divol, L., Sepke, S. M., Kerbel, G. D., Thomas, C. A., Ralph, J. E., Moody, J. D., & Schneider, M. B.. Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics. United States. doi:10.1103/PhysRevLett.118.025002.
Strozzi, D. J., Bailey, D. S., Michel, P., Divol, L., Sepke, S. M., Kerbel, G. D., Thomas, C. A., Ralph, J. E., Moody, J. D., and Schneider, M. B.. Thu . "Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics". United States. doi:10.1103/PhysRevLett.118.025002. https://www.osti.gov/servlets/purl/1341948.
@article{osti_1341948,
title = {Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics},
author = {Strozzi, D. J. and Bailey, D. S. and Michel, P. and Divol, L. and Sepke, S. M. and Kerbel, G. D. and Thomas, C. A. and Ralph, J. E. and Moody, J. D. and Schneider, M. B.},
abstractNote = {The effects of laser-plasma interactions (LPI) on the dynamics of inertial confinement fusion hohlraums are investigated in this work via a new approach that self-consistently couples reduced LPI models into radiation-hydrodynamics numerical codes. The interplay between hydrodynamics and LPI—specifically stimulated Raman scatter and crossed-beam energy transfer (CBET)—mostly occurs via momentum and energy deposition into Langmuir and ion acoustic waves. This spatially redistributes energy coupling to the target, which affects the background plasma conditions and thus, modifies laser propagation. In conclusion, this model shows reduced CBET and significant laser energy depletion by Langmuir waves, which reduce the discrepancy between modeling and data from hohlraum experiments on wall x-ray emission and capsule implosion shape.},
doi = {10.1103/PhysRevLett.118.025002},
journal = {Physical Review Letters},
number = 2,
volume = 118,
place = {United States},
year = {Thu Jan 12 00:00:00 EST 2017},
month = {Thu Jan 12 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 6works
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  • The ignition scale facilities for the inertial confinement fusion now under construction in France and in the United States are based on a low adiabat compression of a spherically symmetric target and a central point ignition. An isochoric heating of a compressed core, known as the fast ignition, offers a possibility to reduce the ignition energy several times and significantly increase the gain. Fast ignition projects for the inertial fusion energy based on a PW-power driver are under discussion now in Europe, United States and Japan. We present the main features of the European project HiPER, aiming at the demonstrationmore » of the laser driven fusion. The key issues for the laser and target specifications are addressed in terms of the basic theory, numerical simulations and experiments on currently available large-scale laser facilities.« less
  • Achieving symmetric hohlraum radiation drive is an important aspect of indirectly driven inertial confinement fusion experiments. However, when experimentally delivered laser powers deviate from ideal conditions, the resultant radiation field can become asymmetric. Two situations in which this may arise are random uncorrelated fluctuations, in as-delivered laser power and laser beams that do not participate in the implosion (either intentionally or unintentionally). Furthermore, laser plasma interactions in the hohlraum obfuscate the connection between laser powers and radiation drive. To study the effect of these situations on drive symmetry, we develop a simplified model for crossed-beam energy transfer, laser backscatter, andmore » plasma absorption that can be used in conjunction with view factor calculations to expediently translate laser powers into three-dimensional capsule flux symmetries. We find that crossed-beam energy transfer can alter both the statistical properties of uncorrelated laser fluctuations and the impact of missing laser beams on radiation symmetry. A method is proposed to mitigate the effects of missing laser beams.« less
  • The experimental evidence for multiple-beam laser-plasma instabilities of relevance to laser driven inertial confinement fusion at the ignition scale is reviewed, in both the indirect and direct-drive approaches. The instabilities described are cross-beam energy transfer (in both indirectly driven targets on the NIF and in direct-drive targets), multiple-beam stimulated Raman scattering (for indirect-drive), and multiple-beam two-plasmon decay instability (in direct drive). Advances in theoretical understanding and in the numerical modeling of these multiple beam instabilities are presented.