Long range temperature fluctuation in LHD

Shigeru Inagaki, Tokihiko Tokuzawa, Kimitaka Itoh, Katsumi Ida, Sanae I. Itoh, Naoki Tamura, Satoru Sakakibara, Naohiro Kasuya, Akihide Fujisawa, Shin Kubo, Takashi Shimozuma, Takeshi Ido, Seiya Nishimura, Hiroyuki Arakawa, Tatsuya Kobayashi, Masatoshi Yagi, Kenji Tanaka, Yoshio Nagayama, Kazuo Kawahata, Shigeru SudoHiroshi Yamada, Akio Komori

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Abstract

We report a detailed correlation technique to identify the long-range temperature fluctuation in the Large Helical Device. Correlation hunting has successfully realized the observation of electron temperature fluctuations, which are characterized by their correlation length comparable to the plasma minor radius, with low frequency of ~ 1-3kHz, ballistic radial propagation (at a speed of ~1km/s, of the order of diamagnetic drift velocity), spatial mode number of m/n = 1/1 (or 2/1), and amplitude of ~2% at the maximum. Bicoherence analysis confirmed their nonlinear coupling with local microscopic turbulent fluctuations. This long-range temperature fluctuation is a possible carrier of fast propagation in transport processes observed so far. We also comment on the theoretical interpretation.

Original languageEnglish
Article number1402017
JournalPlasma and Fusion Research
Volume6
Issue number2011
DOIs
Publication statusPublished - Dec 1 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Inagaki, S., Tokuzawa, T., Itoh, K., Ida, K., Itoh, S. I., Tamura, N., Sakakibara, S., Kasuya, N., Fujisawa, A., Kubo, S., Shimozuma, T., Ido, T., Nishimura, S., Arakawa, H., Kobayashi, T., Yagi, M., Tanaka, K., Nagayama, Y., Kawahata, K., ... Komori, A. (2011). Long range temperature fluctuation in LHD. Plasma and Fusion Research, 6(2011), [1402017]. https://doi.org/10.1585/pfr.6.1402017