Artículo
Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks
Autor/es | García Muñoz, Manuel
Akaslompolo, S. Asunta, O. Boom, J. E. Chen, X. Classen, I. G. J. Rodriguez Ramos, Mauricio Viezzer, Eleonora |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2013 |
Fecha de depósito | 2020-09-02 |
Publicado en |
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Resumen | 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 ... 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 q(95) 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. |
Identificador del proyecto | RYC-2011-09152
ENE2012-31087 PCIG11-GA-2012-321455 DE-FC02-04ER54698 SC-G903402 DEFG02- 04ER54761 DE-AC02-09CH11466 DE-FG02- 08ER54984 2009-0082012 |
Cita | García Muñoz, M., Akaslompolo, S., Asunta, O., Boom, J.E., Chen, X., Classen, I.G.J.,...,Viezzer, E. (2013). Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks. Nuclear Fusion, 53 (12), 123008. https://doi.org/10.1088/0029-5515/53/12/123008. |
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