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(EX/P5-09) Dynamic Effects of Rotating Helical Magnetic Field on Tokamak Edge

S. Takamura1), Y. Kikuchi1), H. Kojima1), Y. Uesugi2), M. Toyoda1), Y. Shiota1), M. Kobayashi3), V.P. Budaev4)
1) Graduate School of Engineering, Nagoya University, Nagoya, Japan
2) Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya, Japan
3) Institut für Plasmaphysik, Forschungszentrum Juelich GmbH, EURATOM Association, Juelich, Germany
4) Russian Research Center, Kurchatov Institute, Moscow, Russia

Abstract.  Recently, comprehensive studies on Dynamic Ergodic Divertor (DED) have re-started by us stimulated by the coming realization of the concept on TEXTOR tokamak. The following aspects of interaction of rotating helical magnetic perturbation (RHMP) with plasmas in HYBTOK-II and CSTN-IV small tokamaks will be given: the penetration of RHMP into the magnetic resonance layer with a controlled poloidal rotation by limiter biasing, the effects on hydrogen recycling, the influence on the electrostatic turbulence through chaos control with a wavelet signal analysis, and the global effects of RHMP on tokamak discharge like an additional poloidal rotation and a local dissipative heating. Especially, an amplified magnetic perturbation was found to be created near the resonance layer by a spatial modification of plasma current due to island formation in the case of low relative velocity between the tokamak plasma and RHMP. A large relative velocity produces an expected attenuation of RHMP near the resonance zone due to flowing of screening current.

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IAEA 2003