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Localized compressional self-heating in magnetic islands

Published online by Cambridge University Press:  13 December 2022

Daniele Villa Open the ORCID record for Daniele Villa [Opens in a new window] ,
Nicolas Dubuit Open the ORCID record for Nicolas Dubuit [Opens in a new window] ,
Olivier Agullo ,
Alexandre Poyé ,
Xavier Garbet  and
Andrei Smolyakov
Daniele Villa*
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, 13013 Marseille, France
Nicolas Dubuit
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, 13013 Marseille, France
Olivier Agullo
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, 13013 Marseille, France
Alexandre Poyé
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, 13013 Marseille, France
Xavier Garbet
Affiliation:
CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
Andrei Smolyakov
Affiliation:
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
*
†Email address for correspondence: [email protected]
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Abstract

A spontaneous heating process is found to arise in a system where a magnetic island is present due to a linearly unstable tearing mode. The parity, the relative phases and the structure of the fields determined linearly by the tearing mode cause the compression of the plasma in the direction parallel to the magnetic field to heat the plasma in the vicinity of the separatrix in the nonlinear phase. Using a six-field electromagnetic fluid model, the process is found to be present in both two-dimensional single-helicity and three-dimensional multi-helicity simulations with both symmetric and asymmetric magnetic equilibrium profiles. A noteworthy feature of the model is that the higher-order compression terms responsible for the heating process are retained in the equations. The process is believed to be linked to experimental observations of localized hot-spots on externally induced magnetic islands.

Keywords

fusion plasmaplasma confinementplasma dynamics
Type
Research Article
Information
Journal of Plasma Physics , Volume 88 , Issue 6 , December 2022 , 905880613
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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References

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