Imperial College London
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DrChristopherWalsh

Faculty of Natural Sciences, Department of Physics

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Location

 

Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tong:2019:1741-4326/ab22d4,
author = {Tong, JK and McGlinchey, K and Appelbe, BD and Walsh, CA and Crilly, AJ and Chittenden, JP},
doi = {1741-4326/ab22d4},
journal = {Nuclear Fusion},
pages = {1--16},
title = {Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots},
url = {http://dx.doi.org/10.1088/1741-4326/ab22d4},
volume = {59},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 fa
AU  - Tong,JK
AU  - McGlinchey,K
AU  - Appelbe,BD
AU  - Walsh,CA
AU  - Crilly,AJ
AU  - Chittenden,JP
DO  - 1741-4326/ab22d4
EP  - 16
PY  - 2019///
SN  - 0029-5515
SP  - 1
TI  - Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots
T2  - Nuclear Fusion
UR  - http://dx.doi.org/10.1088/1741-4326/ab22d4
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000472753400005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://iopscience.iop.org/article/10.1088/1741-4326/ab22d4
UR  - http://hdl.handle.net/10044/1/72674
VL  - 59
ER  -
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