Observation of multi-scale turbulence and non-local transport in LHD plasmas

T. Tokuzawa, S. Inagaki, K. Ida, K. Itoh, T. Ido, A. Shimizu, H. Takahashi, S. Kitajima, N. Tamura, M. Yoshinuma, H. Tsuchiya, I. Yamada, K. Tanaka, T. Akiyama, Y. Nagayama, K. Kawahata, K. Y. Watanabe, H. Yamada

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Abstract

We have studied two types of spatio-temporal turbulence dynamics in plasmas in the Large Helical Device, based on turbulence measurements with high spatial and temporal resolution. Applying conditional ensemble-averaging to a plasma with Edge-Localized Modes (ELMs), fast radial inward propagation of a micro-scale turbulence front is observed just after ELM event, and the propagation speed is evaluated as ∼ 100m/s. A self-organized radial electric field structure is observed in an electrode biasing experiment, and it is found to realize a multi-valued state. The curvature of the radial electric field is found to play an important role for turbulence reduction.

Original languageEnglish
Article number055904
JournalPhysics of Plasmas
Volume21
Issue number5
DOIs
Publication statusPublished - May 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Tokuzawa, T., Inagaki, S., Ida, K., Itoh, K., Ido, T., Shimizu, A., Takahashi, H., Kitajima, S., Tamura, N., Yoshinuma, M., Tsuchiya, H., Yamada, I., Tanaka, K., Akiyama, T., Nagayama, Y., Kawahata, K., Watanabe, K. Y., & Yamada, H. (2014). Observation of multi-scale turbulence and non-local transport in LHD plasmas. Physics of Plasmas, 21(5), [055904]. https://doi.org/10.1063/1.4876619