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**Harvard**

Brodrick, J., Kingham, R., Marinak, M., Patel, M., Chankin, A., Omotani, J., Umansky, M., Del Sorbo, D., Dudson, B., Parker, J., Kerbel, G., Sherlock, M. och Ridgers, C. (2017) *Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications*.

** BibTeX **

@article{

Brodrick2017,

author={Brodrick, J. P. and Kingham, R. J. and Marinak, M. M. and Patel, M. V. and Chankin, A. V. and Omotani, John and Umansky, M. V. and Del Sorbo, D. and Dudson, B. and Parker, J. T. and Kerbel, G. D. and Sherlock, M. and Ridgers, C. P.},

title={Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications},

journal={Physics of Plasmas},

issn={1070-664X},

volume={24},

issue={9},

abstract={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%. },

year={2017},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 252262

A1 Brodrick, J. P.

A1 Kingham, R. J.

A1 Marinak, M. M.

A1 Patel, M. V.

A1 Chankin, A. V.

A1 Omotani, John

A1 Umansky, M. V.

A1 Del Sorbo, D.

A1 Dudson, B.

A1 Parker, J. T.

A1 Kerbel, G. D.

A1 Sherlock, M.

A1 Ridgers, C. P.

T1 Testing nonlocal models of electron thermal conduction for magnetic and inertial confinement fusion applications

YR 2017

JF Physics of Plasmas

SN 1070-664X

VO 24

IS 9

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%.

LA eng

DO 10.1063/1.5001079

LK http://dx.doi.org/10.1063/1.5001079

LK http://publications.lib.chalmers.se/records/fulltext/252262/local_252262.pdf

OL 30