How is turbulence intensity determined by macroscopic variables in a toroidal plasma?

S. Inagaki, T. Tokuzawa, N. Tamura, S. I. Itoh, T. Kobayashi, K. Ida, T. Shimozuma, S. Kubo, K. Tanaka, T. Ido, A. Shimizu, H. Tsuchiya, N. Kasuya, Y. Nagayama, K. Kawahata, S. Sudo, H. Yamada, A. Fujisawa, K. Itoh

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Abstract

We report observations of the dynamic response of micro-fluctuations and turbulent flux to a low-frequency heating power modulation in the Large Helical Device. The responses of heat flux and micro-fluctuation intensity differ from that of the change in temperature gradient. This result violates the local transport model, where turbulence is determined by the local temperature gradient. A new relationship between flux, gradient and turbulence is found. In addition to the temperature gradient, the heating rate is proposed as a new, direct controlling parameter of turbulence to explain the fast response of turbulence against periodic modulation of heating power.

Original languageEnglish
Article number113006
JournalNuclear Fusion
Volume53
Issue number11
DOIs
Publication statusPublished - Nov 1 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Inagaki, S., Tokuzawa, T., Tamura, N., Itoh, S. I., Kobayashi, T., Ida, K., Shimozuma, T., Kubo, S., Tanaka, K., Ido, T., Shimizu, A., Tsuchiya, H., Kasuya, N., Nagayama, Y., Kawahata, K., Sudo, S., Yamada, H., Fujisawa, A., & Itoh, K. (2013). How is turbulence intensity determined by macroscopic variables in a toroidal plasma? Nuclear Fusion, 53(11), [113006]. https://doi.org/10.1088/0029-5515/53/11/113006