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Abstract
The class of plasma instabilities known as edgelocalized modes (ELMs) is of special concern in tokamaks operating in highconfinement mode, such as ASDEX Upgrade and ITER. One strategy for ELM mitigation is the application of resonant magnetic perturbations (RMPs) via external coils. Kinetic modeling accurately describes the plasma response to these RMPs ab initio, particularly the parallel shielding currents at resonant surfaces. Away from resonant surfaces, ideal magnetohydrodynamics (iMHD) is expected to yield sufficiently accurate results, providing a computationally less expensive option that could complement kinetic modeling.
The code MEPHIT has been developed to solve the linearized iMHD equations in a way that is compatible with iterative kinetic modeling approaches. We consider an axisymmetric iMHD equilibrium in realistic tokamak geometry under the influence of a quasistatic nonaxisymmetric external perturbation from ELM mitigation coils. The plasma responds to this external magnetic perturbation with a current perturbation, which in turn produces a magnetic field perturbation. The resulting fixedpoint equation can be solved in a selfconsistent manner by preconditioned iterations in which Ampère's equation and the magnetic differential equations for pressure and current are solved in alternation until convergence is reached. After expansion in toroidal Fourier harmonics, these equations are solved on a triangular mesh in the poloidal plane using finite elements. These results are then benchmarked against established codes.
Originalsprache  englisch 

Aufsatznummer  012014 
Fachzeitschrift  Journal of Physics: Conference Series 
Jahrgang  2397 
Ausgabenummer  1 
DOIs  
Publikationsstatus  Veröffentlicht  12 Dez. 2022 
Veranstaltung  Joint VarennaLausanne International Workshop 2022: Theory of Fusion Plasmas  Villa Monastero, Varenna, Italien Dauer: 11 Sep. 2022 → 16 Sep. 2022 
ASJC Scopus subject areas
 Physik und Astronomie (insg.)
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EUROFusion  Transport und Heizung in Fusionsplasmen
Kernbichler, W., Albert, C., Eder, M., Kasilov, S., Markl, M., Buchholz, R., Graßler, G. S., Kamendje, R. L., Babin, R. & Lainer, P.
1/01/21 → …
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Joint VarennaLausanne International Workshop 2022
Patrick Lainer (Teilnehmer/in)
11 Sep. 2022 → 16 Sep. 2022Aktivität: Teilnahme an / Organisation von › Konferenz oder Fachtagung (Teilnahme an/Organisation von)