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(EXP5/07) On the Role of Rational Surfaces on Transport in Fusion Plasmas

L. Garcia¹⁾, M. A. Pedrosa²⁾, C. Hidalgo²⁾, B. A. Carreras³⁾, R. Balbín²⁾, A. López-Fraguas²⁾, V. E. Lynch³⁾, J. A. Jiménez²⁾, B. van Milligen²⁾, E. Sánchez^2)
 
1) Universidad Carlos III, 28911 Leganes, Madrid, Spain
²⁾ Asociación EURATOM-CIEMAT, 28040 Madrid, Spain
³⁾ Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.

Abstract.  Experimental evidence of ExB sheared flows linked to rational surfaces has been obtained in the plasma edge region of the TJ-II stellarator. A possible explanation of the flow structure near the rational surface is the nonlinear beating of the magnetic field component of a vacuum field island with a plasma instability. To simulate the main characteristics of the experimental results, we use a resistive interchange model with the rotational transform profile determined by the vacuum magnetic field calculations.

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