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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.

Additional information

Authors: EVANS T E et al, General Atomics, San Diego (US)
Bibliographic Reference: An article published in: Phys. Rev. Lett. 92, 235003 (2004)
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Record Number: 200719150 / Last updated on: 2007-05-21
Original language: en
Available languages: en