Mechanism of Edge Localized Mode Mitigation by Resonant Magnetic Perturbations

0435991 - ÚFP 2015 RIV US eng J - Článek v odborném periodiku
Bécoulet, M. - Orain, F. - Huijsmans, G.T.A. - Pamela, S. - Cahyna, Pavel - Hoelzl, M. - Garbet, X. - Franck, E. - Sonnendruecker, E. - Dif-Pradalier, G. - Passeron, C. - Latu, G. - Morales, J. - Nardon, E. - Fil, A. - Nkonga, B. - Ratnani, A. - Grandgirard, V.
Mechanism of Edge Localized Mode Mitigation by Resonant Magnetic Perturbations.
Physical Review Letters. Roč. 113, č. 11 (2014), s. 115001-115001. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA ČR GAP205/11/2341
Institucionální podpora: RVO:61389021
Klíčová slova: tokamak * ELMs
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 7.512, rok: 2014

A possible mechanism of edge localized modes (ELMs) mitigation by resonant magnetic perturbations (RMPs) is proposed based on the results of nonlinear resistive magnetohydrodynamic modeling using the JOREK code, realistic JET-like plasma parameters and an RMP spectrum of JET error-field correction coils (EFCC) with a main toroidal number n = 2 were used in the simulations. Without RMPs, a large ELM relaxation is obtained mainly due to the most unstable medium-n ballooning mode. The externally imposed RMP drives nonlinearly the modes coupled to n = 2 RMP which produce small multimode relaxations, mitigated ELMs. The modes driven by RMPs exhibit a tearinglike structure and produce additional islands. Mitigated ELMs deposit energy into the divertor mainly in the structures ("footprints") created by n = 2 RMPs, however, slightly modulated by other nonlinearly driven even harmonics. The divertor power flux during a ELM phase mitigated by RMPs is reduced almost by a factor of 10.
Trvalý link: http://hdl.handle.net/11104/0239825