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Phys Rev Lett. 2016 Sep 9;117(11):115001. doi: 10.1103/PhysRevLett.117.115001. Epub 2016 Sep 9.

Nonlinear Transition from Mitigation to Suppression of the Edge Localized Mode with Resonant Magnetic Perturbations in the EAST Tokamak.

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Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei 230031, China.
Institute for Energy and Climate Research-Plasma Physics, Forschungszentrum Jülich, 52425 Jülich, Germany.
CCFE Culham Science Centre, Abingdon, OX14 3DB, United Kingdom.
School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China.
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.


Evidence of a nonlinear transition from mitigation to suppression of the edge localized mode (ELM) by using resonant magnetic perturbations (RMPs) in the EAST tokamak is presented. This is the first demonstration of ELM suppression with RMPs in slowly rotating plasmas with dominant radio-frequency wave heating. Changes of edge magnetic topology after the transition are indicated by a gradual phase shift in the plasma response field from a linear magneto hydro dynamics modeling result to a vacuum one and a sudden increase of three-dimensional particle flux to the divertor. The transition threshold depends on the spectrum of RMPs and plasma rotation as well as perturbation amplitude. This means that edge topological changes resulting from nonlinear plasma response plays a key role in the suppression of ELM with RMPs.

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