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Observation of ELM suppression in hybrid discharges using n = 3 magnetic perturbations on DIII-D

Large type-I edge localized modes (ELMs) are completely suppressed in hybrid discharges for the first time by applying an edge resonant perturbation (RMP) using an internal coil set with toroidal mode number n = 3. This is an important advance in developing hybrid discharges as a baseline operating...

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Published in:Nuclear fusion 2010-02, Vol.50 (2), p.022002-022002
Main Authors: Petty, C.C, Evans, T.E, DeBoo, J.C, Hudson, B, La Haye, R.J, Luce, T.C, Politzer, P.A, Allen, S.L, Doyle, E.J, Fenstermacher, M.E, Ferron, J.R, Hyatt, A.W, Jayakumar, R.J, Moyer, R.A, Osborne, T.H
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Language:English
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Summary:Large type-I edge localized modes (ELMs) are completely suppressed in hybrid discharges for the first time by applying an edge resonant perturbation (RMP) using an internal coil set with toroidal mode number n = 3. This is an important advance in developing hybrid discharges as a baseline operating scenario for ITER. In these experiments on the DIII-D tokamak, the ELM suppression lasts for ~1 s in plasmas with normalized beta up to Delta *bN = 2.5 (volume average beta up to Delta *b = 3.4%) and a fusion performance factor as high as , which equals the value for the Q = 10 scenario in ITER. A strong interaction between the 3/2 neoclassical tearing mode and the RMP, which slows the pedestal toroidal rotation, limits the achievable Delta *bN and the duration of ELM suppression.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/50/2/022002