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:
-
- 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}
}
Web of Science
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Works referencing / citing this record:
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