On Ohm’s law in reduced plasma fluid models

Dudson, Benjamin D.; Newton, S. L.; Omotani, J. T.; Birch, J.

doi:10.1088/1361-6587/ac2af9

Title: On Ohm’s law in reduced plasma fluid models

Journal Article · 25 October 2021 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ac2af9 · OSTI ID:1840134

^[1]; Newton, S. L. ^[2];

^[2]; Birch, J. ^[3]

Univ. of York (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Culham Centre for Fusion Energy, Oxon (United Kingdom)
Culham Centre for Fusion Energy, Oxon (United Kingdom); Univ. of Exeter (United Kingdom)

Drift-reduced MHD models are widely used to study magnetised plasma phenomena, in particular for magnetically confined fusion applications, as well as in solar and astrophysical research. This letter discusses the choice of Ohm's law in these models, the resulting dispersion relations for the dynamics parallel to the magnetic field, and the implications for numerical simulations. We find that if electron pressure is included in Ohm's law, then both electromagnetic and finite electron mass effects must also be included in order to obtain physical dispersion relations. A simple modification to the plasma vorticity is also found which improves handling of low density regions, of particular relevance to the simulation of the boundary region of magnetised plasmas.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1840134

Report Number(s):: LLNL-JRNL--826562; 1041291

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 63; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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