Non-linear MHD modeling of edge localized mode cycles and mitigation by resonant magnetic perturbations

0454112 - ÚFP 2016 RIV GB eng J - Journal Article
Orain, F. - Bécoulet, M. - Morales, J. - Huijsmans, G.T.A. - Dif-Pradalier, G. - Hoelzl, M. - Garbet, X. - Pamela, S. - Nardon, E. - Passeron, C. - Latu, G. - Fil, A. - Cahyna, Pavel
Non-linear MHD modeling of edge localized mode cycles and mitigation by resonant magnetic perturbations.
Plasma Physics and Controlled Fusion. Roč. 57, č. 1 (2015), č. článku 014020. ISSN 0741-3335. E-ISSN 1361-6587
EU Projects: European Commission(XE) 633053
Institutional support: RVO:61389021
Keywords : ELM * RMP * MHD * cycles * mitigation * tokamaks * plasmas
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.404, year: 2015
http://iopscience.iop.org/article/10.1088/0741-3335/57/1/014020

The dynamics of a multi-edge localized mode (ELM) cycle as well as the ELM mitigation by resonant magnetic perturbations (RMPs) are modeled in realistic tokamak X-point geometry with the non-linear reduced MHD code JOREK. The diamagnetic rotation is found to be a key parameter enabling us to reproduce the cyclical dynamics of the plasma relaxations and to model the near-symmetric ELM power deposition on the inner and outer divertor target plates consistently with experimental measurements. Moreover, the non-linear coupling of the RMPs with unstable modes are found to modify the edge magnetic topology and induce a continuous MHD activity in place of a large ELM crash, resulting in the mitigation of the ELMs. At larger diamagnetic rotation, a bifurcation from unmitigated ELMs-at low RMP current-towards fully suppressed ELMs-at large RMP current-is obtained
Permanent Link: http://hdl.handle.net/11104/0254808