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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. Budaev^4)
 
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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