The impact of edge localized modes (ELMs) and externally applied resonant and non-resonant magnetic perturbations (MPs) on fast-ion confinement/transport have been investigated in the ASDEX Upgrade (AUG), DIII-D and KSTAR tokamaks. Two phases with respect to the ELM cycle can be clearly distinguished in ELM-induced fast-ion losses. Inter-ELM losses are characterized by a coherent modulation of the plasma density around the separatrix while intra-ELM losses appear as well-defined bursts. In high collisionality plasmas with mitigated ELMs, externally applied MPs have little effect on kinetic profiles, including fast-ions, while a strong impact on kinetic profiles is observed in low-collisionality, low q95 plasmas with resonant and non-resonant MPs. In low-collisionality H-mode plasmas, the large fast-ion filaments observed during ELMs are replaced by a loss of fast-ions with a broad-band frequency and an amplitude of up to an order of magnitude higher than the neutral beam injection prompt loss signal without MPs. A clear synergy in the overall fast-ion transport is observed between MPs and neoclassical tearing modes. Measured fast-ion losses are typically on banana orbits that explore the entire pedestal/scrape-off layer. The fast-ion response to externally applied MPs presented here may be of general interest for the community to better understand the MP field penetration and overall plasma response. © 2013 IAEA, Vienna.
Garcia Munoz, M., Akaslompolo, S., Asunta, O., Boom, J., Chen, X., Classen, I., et al. (2013). Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks. NUCLEAR FUSION, 53(12).
|Citazione:||Garcia Munoz, M., Akaslompolo, S., Asunta, O., Boom, J., Chen, X., Classen, I., et al. (2013). Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks. NUCLEAR FUSION, 53(12).|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||Si|
|Titolo:||Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks|
|Autori:||Garcia Munoz, M; Akaslompolo, S; Asunta, O; Boom, J; Chen, X; Classen, I; Dux, R; Evans, T; Fietz, S; Fisher, R; Fuchs, C; Geiger, B; Hoelzl, M; Igochine, V; Jeon, Y; Kim, J; Kim, J; Kurzan, B; Lazanyi, N; Lunt, T; McDermott, R; Nocente, M; Pace, D; Rhodes, T; Rodriguez-Ramos, M; Shinohara, K; Suttrop, W; Van Zeeland, M; Viezzer, E; Willensdorfer, M; Wolfrum, E|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/0029-5515/53/12/123008|
|Appare nelle tipologie:||01 - Articolo su rivista|