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 (-mode) plasmas. The resulting mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The 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 modes and may be attractive for ELM control in next-step fusion tokamaks.
- Received 10 December 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.235003
©2004 American Physical Society