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Journal Articles Journal of Plasma Physics Year : 2022

Localized compressional self-heating in magnetic islands

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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 non-linear phase. Using a 6-field electromagnetic fluid model, the process is found to be present in both 2D single-helicity and 3D multi-helicity simulations with both symmetric and a-symmetric 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.
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Dates and versions

hal-03870019 , version 1 (24-11-2022)

Identifiers

  • HAL Id : hal-03870019 , version 1

Cite

Daniele Villa, Nicolas Dubuit, Olivier Agullo, Alexandre Poyé, Xavier Garbet, et al.. Localized compressional self-heating in magnetic islands. Journal of Plasma Physics, In press. ⟨hal-03870019⟩
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