Abstract
The interaction between Edge-Localized Modes (ELMs) and Resonant Magnetic Perturbations (RMPs) is modeled with the magnetohydrodynamic code JOREK using experimental parameters from ASDEX Upgrade discharges. According to the modeling, the ELM mitigation or suppression is optimal when the amplification of both tearing and peeling-kink responses results in a better RMP penetration. The ELM mitigation or suppression is not only due to the reduction of the pressure gradient but predominantly arises from the toroidal coupling between the ELMs and the RMP-induced mode at the plasma edge, forcing the edge modes to saturate at a low level. The bifurcation from ELM mitigation to ELM suppression is observed when the RMP amplitude is increased. ELM mitigation is characterized by rotating modes at the edge, while the mode locking to RMPs is induced by the resonant braking of the electron perpendicular flow in the ELM suppression regime.
| Original language | English |
|---|---|
| Article number | 042503 |
| Number of pages | 13 |
| Journal | Physics of Plasmas |
| Volume | 26 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Apr 2019 |
Funding
This work was carried out within the framework of the EUROfusion Consortium and received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. Part of this work was carried out using the Marconi-fusion supercomputer operated at Cineca, Italy, and the HELIOS supercomputer system at Computational Situational Centre of International Fusion Energy Research Centre (IFERC-CSC), Aomori, Japan, under the Broader Approach collaboration between Euratom and Japan, implemented by Fusion for Energy and JAEA. The first author acknowledges interesting discussions with Timothée Nicolas, Pascale Hennequin, Marco Cavedon, Hinrich Lu€tjens, Élisée Trier, and Vinodh Bandaru. The views and opinions expressed herein do not necessarily reflect those of the European Commission.