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Magnetic perturbation experiments on MAST L- and H-mode plasmas using internal coils
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SYSNO ASEP 0366888 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Magnetic perturbation experiments on MAST L- and H-mode plasmas using internal coils Author(s) Kirk, A. (GB)
Liu, Y.Q. (GB)
Nardon, E. (FR)
Tamain, P. (FR)
Cahyna, Pavel (UFP-V) RID
Chapman, I. (GB)
Denner, P. (GB)
Meyer, H. (GB)
Mordijck, S. (US)
Temple, D. (GB)Source Title Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 53, č. 6 (2011), 065011-065011Number of pages 18 s. Publication form web - web Language eng - English Country GB - United Kingdom Keywords Resonant magnetic perturbations ; L-H transition ; spherical tokamaks ; edge localized modes Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GAP205/11/2341 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000290558900014 DOI 10.1088/0741-3335/53/6/065011 Annotation Experiments have been performed on MAST using internal (n = 3) resonant magnetic perturbation (RMP) coils. The application of the RMPs to L-mode discharges has shown a clear density pump-out when the field line pitch angle at the low-field side of the plasma is sufficiently well aligned with the applied field. The application of the RMPs before the L–H transition increases the power required to achieve H-mode by at least 30%. In type I ELMing H-mode discharges, at a particular value of q95, the ELM frequency can be increased by a factor of 5 by the application of the RMPs. This effect on the ELMs and the L-mode density pump-out is not correlated with the width of the region for which the Chirikov parameter, calculated using the vacuum field, is greater than 1 but may be correlated with the size of the resonant component of the applied field in the pedestal region or with the location of the peak plasma displacement when the plasma response is taken into account. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2012
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