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Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary |
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| Authors: | Evans T E Moyer R A Thomas P R Watkins J G Osborne T H Boedo J A Doyle E J Fenstermacher M E Finken K H Groebner R J Groth M Harris J H La Haye R J Lasnier C J Masuzaki S Ohyabu N Pretty D G Rhodes T L Reimerdes H Rudakov D L Schaffer M J Wang G Zeng L |
| Institution: | General Atomics, San Diego, California, USA. |
| Abstract: | A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement are unaffected by the stochastic boundary, despite a threefold drop in the toroidal rotation. These results demonstrate that stochastic boundaries are compatible with H modes and may be attractive for ELM control in next-step fusion tokamaks. |
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