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K. Ida, N. Tamura, H. Tuchiya, S. Inagaki, T. Kobayashi, M. Yoshinuma, C. Suzuki, Y. Suzuki, Y. Narushima, T. Shimozuma, S. Kubo, H. Takahashi, LHD experiment group
Evidence of Stochastic Region near a Rational Surface in Core Plasmas of LHD
Date of publication:
22 IAEA Fusion Energy Conference, EXS/5-2
Clear evidence of stochastization of the magnetic surfaces near a rational surface is observed in the core plasma with weak magnetic shear in the Large Helical Device (LHD) by applying heat pulses driven by modulated electron cyclotron heating (MECH). The stochastization of the magnetic surfaces is confirmed by the observation of flattening of electron temperature (T_e) profiles and very fast propagation of the heat pulse, which is in contrast to the slow heat pulse propagation observed in the Te flat region of the nested magnetic island.
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