Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile

Patrick Maget; Fabien Widmer; Olivier Février; Xavier Garbet; Hinrich Lütjens

doi:10.1063/1.5021759

Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile

Patrick Maget
, Fabien Widmer
, Olivier Février
, Xavier Garbet
, Hinrich Lütjens

Research output: Contribution to journal › Article › peer-review

Abstract

In tokamaks plasmas, turbulent transport is triggered above a threshold in the temperature gradient and leads to stiff profiles. This particularity, neglected so far in the problem of magnetic island stabilization by a localized heat source, is investigated analytically in this paper. We show that the efficiency of the stabilization is deeply modified compared to the previous estimates due to the strong dependence of the turbulence level on the additional heat source amplitude inside the island.

Original language	English
Article number	022514
Journal	Physics of Plasmas
Volume	25
Issue number	2
DOIs	https://doi.org/10.1063/1.5021759
Publication status	Published - 1 Feb 2018

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abstract = "In tokamaks plasmas, turbulent transport is triggered above a threshold in the temperature gradient and leads to stiff profiles. This particularity, neglected so far in the problem of magnetic island stabilization by a localized heat source, is investigated analytically in this paper. We show that the efficiency of the stabilization is deeply modified compared to the previous estimates due to the strong dependence of the turbulence level on the additional heat source amplitude inside the island.",

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AU - Lütjens, Hinrich

PY - 2018/2/1

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AB - In tokamaks plasmas, turbulent transport is triggered above a threshold in the temperature gradient and leads to stiff profiles. This particularity, neglected so far in the problem of magnetic island stabilization by a localized heat source, is investigated analytically in this paper. We show that the efficiency of the stabilization is deeply modified compared to the previous estimates due to the strong dependence of the turbulence level on the additional heat source amplitude inside the island.

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Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile

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