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Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots

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Tong+et+al_2019_Nucl._Fusion_10.1088_1741-4326_ab22d4.pdfAccepted version1.76 MBAdobe PDFView/Open
Title: Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots
Authors: Tong, JK
McGlinchey, K
Appelbe, BD
Walsh, CA
Crilly, AJ
Chittenden, JP
Item Type: Journal Article
Abstract: We present simulations of ignition and burn based on the Highfoot and high-density carbon indirect drive designs of the National Ignition Facility for three regimes of alpha-heating—self-heating, robust ignition and propagating burn—exploring hotspot power balance, perturbations and hydrodynamic scaling. A Monte-Carlo particle-in-cell charged particle transport package for the radiation-magnetohydrodynamics code Chimera was developed for this purpose, using a linked-list type data structure. The hotspot power balance between alpha-heating, electron thermal conduction and radiation was investigated in 1D for the three burn regimes. Stronger alpha-heating levels alter the hydrodynamics: sharper temperature and density gradients at hotspot edge; and increased hotspot pressures which further compress the shell, increase hotspot size and induce faster re-expansion. The impact of perturbations on this power balance is explored in 3D using a single Rayleigh–Taylor spike. Heat flow into the perturbation from thermal conduction and alpha-heating increases by factors of , due to sharper temperature gradients and increased proximity of the cold, dense material to the main fusion regions respectively. The radiative contribution remains largely unaffected in magnitude. Hydrodynamic scaling with capsule size and laser energy of different perturbation scenarios (a short-wavelength multi-mode and a long-wavelength radiation asymmetry) is explored in 3D, demonstrating the differing hydrodynamic evolution of the three alpha-heating regimes. The multi-mode yield increases faster with scale factor due to more synchronous compression producing higher temperatures and densities, and therefore stronger bootstrapping of alpha-heating. The perturbed implosions exhibit differences in hydrodynamic evolution due to alpha-heating in addition to the 1D effects, including: reduced perturbation growth due to ablation from both fire-polishing and stronger thermal conduction; and faster re-expansion into regions of weak confinement, which can result in loss of confinement.
Issue Date: 1-Aug-2019
Date of Acceptance: 20-May-2019
URI: http://hdl.handle.net/10044/1/72674
DOI: https://doi.org/10.1088/1741-4326/ab22d4
ISSN: 0029-5515
Publisher: IOP Publishing
Start Page: 1
End Page: 16
Journal / Book Title: Nuclear Fusion
Volume: 59
Issue: 8
Copyright Statement: © 2019 IAEA.
Sponsor/Funder: AWE Plc
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Funder's Grant Number: 300115146/1
EP/M01102X/1
EP/P010288/1
B618573
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
alpha-heating
ignition
burn
inertial confinement fusion
hydrodynamic scaling
IGNITION
INSTABILITY
COLLISIONS
DYNAMICS
MATTER
QEOS
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
alpha-heating
ignition
burn
inertial confinement fusion
hydrodynamic scaling
IGNITION
INSTABILITY
COLLISIONS
DYNAMICS
MATTER
QEOS
physics.plasm-ph
physics.plasm-ph
Fluids & Plasmas
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Publication Status: Published
Article Number: ARTN 086015
Online Publication Date: 2019-05-20
Appears in Collections:Physics
Plasma Physics