Imperial College London
Alternate

DrRobertKingham

Faculty of Natural Sciences, Department of Physics

Reader in Plasma Physics
 
 
 
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Contact

 

+44 (0)20 7594 7637rj.kingham Website

 
 
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Location

 

724Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Brodrick:2017:10.1063/1.5001079,
author = {Brodrick, JP and Kingham, RJ and Marinak, MM and Patel, MV and Chankin, AV and Omotani, JT and Umansky, MV and Del, Sorbo D and Dudson, B and Parker, JT and Kerbel, GD and Sherlock, M and Ridgers, CP},
doi = {10.1063/1.5001079},
journal = {PHYSICS OF PLASMAS},
title = {Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications},
url = {http://dx.doi.org/10.1063/1.5001079},
volume = {24},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Three models for nonlocal electron thermal transport are here compared against Vlasov-Fokker-Planck (VFP) codes to assess their accuracy in situations relevant to both inertial fusion hohlraums and tokamak scrape-off layers. The models tested are (i) a moment-based approach using an eigenvector integral closure (EIC) originally developed by Ji, Held, and Sovinec [Phys. Plasmas 16, 022312 (2009)]; (ii) the non-Fourier Landau-fluid (NFLF) model of Dimits, Joseph, and Umansky [Phys. Plasmas 21, 055907 (2014)]; and (iii) Schurtz, Nicolaï, and Busquet’s [Phys. Plasmas 7, 4238 (2000)] multigroup diffusion model (SNB). We find that while the EIC and NFLF models accurately predict the damping rate of a small-amplitude temperature perturbation (within 10% at moderate collisionalities), they overestimate the peak heat flow by as much as 35% and do not predict preheat in the more relevant case where there is a large temperature difference. The SNB model, however, agrees better with VFP results for the latter problem if care is taken with the definition of the mean free path. Additionally, we present for the first time a comparison of the SNB model against a VFP code for a hohlraum-relevant problem with inhomogeneous ionisation and show that the model overestimates the heat flow in the helium gas-fill by a factor of ∼2 despite predicting the peak heat flux to within 16%.
AU  - Brodrick,JP
AU  - Kingham,RJ
AU  - Marinak,MM
AU  - Patel,MV
AU  - Chankin,AV
AU  - Omotani,JT
AU  - Umansky,MV
AU  - Del,Sorbo D
AU  - Dudson,B
AU  - Parker,JT
AU  - Kerbel,GD
AU  - Sherlock,M
AU  - Ridgers,CP
DO  - 10.1063/1.5001079
PY  - 2017///
SN  - 1070-664X
TI  - Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications
T2  - PHYSICS OF PLASMAS
UR  - http://dx.doi.org/10.1063/1.5001079
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000412107400035&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/52931
VL  - 24
ER  -
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