Implications of X-point lobe structures due to resonant magnetic perturbations on MAST

0383598 - ÚFP 2013 RIV SE eng C - Konferenční příspěvek (zahraniční konf.)
Harrison, J.R. - Kirk, A. - Chapman, I.T. - Scannell, R. - Cahyna, Pavel - Liu, Y. - Nardon, E. - Thornton, A.J.
Implications of X-point lobe structures due to resonant magnetic perturbations on MAST.
EPS Europhysics Conference Abstracts Volume 36F – Contributed papers. Vol. 36F. Mulhouse: European Physical Society, 2012 - (Ratynskaya, S.; Blomberg, L.; Fasoli, A.), O2.104-O2.104. Europhysics Conference Abstracts. ISBN 2-914771-79-7.
[European Physical Society Conference on Plasma Physics & 16th International Congress on Plasma Physics (EPS/ICPP 2012)/39./. Stockholm (SE), 02.07.2012-06.07.2012]
Výzkumný záměr: CEZ:AV0Z20430508
Klíčová slova: MAST * homoclinic tangle * edge localized mode * resonant magnetic perturbation
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
http://ocs.ciemat.es/epsicpp2012pap/pdf/O2.104.pdf

In order to assess the effectiveness of RMPs in mitigating the divertor power loading due to type I ELMs, experiments were performed on MAST using a set of 18 RMP coils. These have allowed ELM mitigation to be established in plasmas by applying fields with toroidal mode numbers n = 3, 4 or 6. Coincident with the effect of RMPs on the ELMs, for the first time, clear lobe structures have been observed to form near the x-point. These lobes, or manifold structures, have been predicted previously, and these observations are the first detailed measurements of their spatial structure in a range of plasma and RMP configurations. The appearance of the lobes is correlated with the effect of the RMPs on the plasma, which is manifest as a density pump out or an increase in ELM frequency, but form at a different ELM coil current threshold than for ELM mitigation.
Trvalý link: http://hdl.handle.net/11104/0007224