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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 |
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Main Authors: | , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0029-5515 1741-4326 |
DOI: | 10.1088/0029-5515/50/2/022002 |