The ideal-MHD theory of axisymmetric modes with toroidal mode number n= 0 in tokamak plasmas is developed. These modes are resonant at the magnetic X-points of the tokamak divertor separatrix. As a consequence, current sheets form along the separatrix, which profoundly affect the stability of vertical plasma displacements. In particular, current sheets at the magnetic separatrix lead to stabilization of n= 0 modes, at least on the ideal-MHD time scale, adding an important ingredient to the mechanism of passive feedback stabilization.
Impact of magnetic X-points on the vertical stability of tokamak plasmas / Adil, Yolbarsop; Porcelli, Francesco; Fitzpatrick, Richard. - In: NUCLEAR FUSION. - ISSN 0029-5515. - ELETTRONICO. - (2021). [10.1088/1741-4326/ac27c5]
Impact of magnetic X-points on the vertical stability of tokamak plasmas
Franco Porcelli;
2021
Abstract
The ideal-MHD theory of axisymmetric modes with toroidal mode number n= 0 in tokamak plasmas is developed. These modes are resonant at the magnetic X-points of the tokamak divertor separatrix. As a consequence, current sheets form along the separatrix, which profoundly affect the stability of vertical plasma displacements. In particular, current sheets at the magnetic separatrix lead to stabilization of n= 0 modes, at least on the ideal-MHD time scale, adding an important ingredient to the mechanism of passive feedback stabilization.File | Dimensione | Formato | |
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Open Access dal 18/09/2022
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https://hdl.handle.net/11583/2929412