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Title: Imposed magnetic field and hot electron propagation in inertial fusion hohlraums

Abstract

The effects of an imposed, axial magnetic field $$B_{z0}$$ on hydrodynamics and energetic electrons in inertial confinement fusion indirect-drive hohlraums are studied. We present simulations from the radiation-hydrodynamics code HYDRA of a low-adiabat ignition design for the National Ignition Facility, with and without $$B_{z0}=70~\text{T}$$. The field’s main hydrodynamic effect is to significantly reduce electron thermal conduction perpendicular to the field. This results in hotter and less dense plasma on the equator between the capsule and hohlraum wall. The inner laser beams experience less inverse bremsstrahlung absorption before reaching the wall. The X-ray drive is thus stronger from the equator with the imposed field. We study superthermal, or ‘hot’, electron dynamics with the particle-in-cell code ZUMA, using plasma conditions from HYDRA. During the early-time laser picket, hot electrons based on two-plasmon decay in the laser entrance hole (Regan et al., Phys. Plasmas, vol. 17(2), 2010, 020703) are guided to the capsule by a 70 T field. Twelve times more energy deposits in the deuterium–tritium fuel. For plasma conditions early in peak laser power, we present mono-energetic test-case studies with ZUMA as well as sources based on inner-beam stimulated Raman scattering. Furthermore, the effect of the field on deuterium–tritium deposition depends strongly on the source location, namely whether hot electrons are generated on field lines that connect to the capsule.

Authors:
 [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:
1251088
Report Number(s):
LLNL-JRNL-672080
Journal ID: ISSN 0022-3778; applab
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Plasma Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 06; Journal ID: ISSN 0022-3778
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION

Citation Formats

Strozzi, David J., Perkins, L. J., Marinak, M. M., Larson, D. J., Koning, J. M., and Logan, B. G. Imposed magnetic field and hot electron propagation in inertial fusion hohlraums. United States: N. p., 2015. Web. doi:10.1017/S0022377815001348.
Strozzi, David J., Perkins, L. J., Marinak, M. M., Larson, D. J., Koning, J. M., & Logan, B. G. Imposed magnetic field and hot electron propagation in inertial fusion hohlraums. United States. https://doi.org/10.1017/S0022377815001348
Strozzi, David J., Perkins, L. J., Marinak, M. M., Larson, D. J., Koning, J. M., and Logan, B. G. Wed . "Imposed magnetic field and hot electron propagation in inertial fusion hohlraums". United States. https://doi.org/10.1017/S0022377815001348. https://www.osti.gov/servlets/purl/1251088.
@article{osti_1251088,
title = {Imposed magnetic field and hot electron propagation in inertial fusion hohlraums},
author = {Strozzi, David J. and Perkins, L. J. and Marinak, M. M. and Larson, D. J. and Koning, J. M. and Logan, B. G.},
abstractNote = {The effects of an imposed, axial magnetic field $B_{z0}$ on hydrodynamics and energetic electrons in inertial confinement fusion indirect-drive hohlraums are studied. We present simulations from the radiation-hydrodynamics code HYDRA of a low-adiabat ignition design for the National Ignition Facility, with and without $B_{z0}=70~\text{T}$. The field’s main hydrodynamic effect is to significantly reduce electron thermal conduction perpendicular to the field. This results in hotter and less dense plasma on the equator between the capsule and hohlraum wall. The inner laser beams experience less inverse bremsstrahlung absorption before reaching the wall. The X-ray drive is thus stronger from the equator with the imposed field. We study superthermal, or ‘hot’, electron dynamics with the particle-in-cell code ZUMA, using plasma conditions from HYDRA. During the early-time laser picket, hot electrons based on two-plasmon decay in the laser entrance hole (Regan et al., Phys. Plasmas, vol. 17(2), 2010, 020703) are guided to the capsule by a 70 T field. Twelve times more energy deposits in the deuterium–tritium fuel. For plasma conditions early in peak laser power, we present mono-energetic test-case studies with ZUMA as well as sources based on inner-beam stimulated Raman scattering. Furthermore, the effect of the field on deuterium–tritium deposition depends strongly on the source location, namely whether hot electrons are generated on field lines that connect to the capsule.},
doi = {10.1017/S0022377815001348},
journal = {Journal of Plasma Physics},
number = 06,
volume = 81,
place = {United States},
year = {Wed Dec 02 00:00:00 EST 2015},
month = {Wed Dec 02 00:00:00 EST 2015}
}

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Works referencing / citing this record:

Simulation of self-generated magnetic fields in an inertial fusion hohlraum environment
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The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion
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Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications
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Magnetised thermal self-focusing and filamentation of long-pulse lasers in plasmas relevant to magnetised ICF experiments
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