Imposed magnetic field and hot electron propagation in inertial fusion hohlraums

Strozzi, David J.; Perkins, L. J.; Marinak, M. M.; Larson, D. J.; Koning, J. M.; Logan, B. G.

doi:10.1017/S0022377815001348

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

Journal Article · Wed Dec 02 00:00:00 EST 2015 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377815001348· OSTI ID:1251088

Strozzi, David J. ^[1]; Perkins, L. J. ^[1]; Marinak, M. M. ^[1]; Larson, D. J. ^[1]; Koning, J. M. ^[1]; Logan, B. G. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1251088

Report Number(s):: LLNL-JRNL-672080; applab

Journal Information:: Journal of Plasma Physics, Vol. 81, Issue 06; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Simulation of self-generated magnetic fields in an inertial fusion hohlraum environment Farmer, W. A.; Koning, J. M.; Strozzi, D. J. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983140	journal	May 2017
The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion Perkins, L. J.; Ho, D. D. -M; Logan, B. G. Physics of Plasmas, Vol. 24, Issue 6 https://doi.org/10.1063/1.4985150	journal	June 2017
Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications Brodrick, J. P.; Kingham, R. J.; Marinak, M. M. Physics of Plasmas, Vol. 24, Issue 9 https://doi.org/10.1063/1.5001079	journal	September 2017
Magnetised thermal self-focusing and filamentation of long-pulse lasers in plasmas relevant to magnetised ICF experiments Watkins, H. C.; Kingham, R. J. Physics of Plasmas, Vol. 25, Issue 9 https://doi.org/10.1063/1.5049229	journal	September 2018
Perturbation modifications by pre-magnetisation of inertial confinement fusion implosions Walsh, C. A.; McGlinchey, K.; Tong, J. K. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5085498	journal	February 2019
Study of laser produced plasma in a longitudinal magnetic field Ivanov, V. V.; Maximov, A. V.; Betti, R. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5091702	journal	June 2019
Incorporating kinetic effects on Nernst advection in inertial fusion simulations Brodrick, J. P.; Sherlock, M.; Farmer, W. A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aaca0b	journal	June 2018

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