TY - JOUR
T1 - Long range temperature fluctuation in LHD
AU - Shigeru, Inagaki
AU - Tokuzawa, Tokihiko
AU - Itoh, Kimitaka
AU - Ida, Katsumi
AU - Itoh, Sanae
AU - Tamura, Naoki
AU - Sakakibara, Satoru
AU - Kasuya, Naohiro
AU - Fujisawa, Akihide
AU - Kubo, Shin
AU - Shimozuma, Takashi
AU - Ido, Takeshi
AU - Nishimura, Seiya
AU - Arakawa, Hiroyuki
AU - Kobayashi, Tatsuya
AU - Yagi, Masatoshi
AU - Tanaka, Kenji
AU - Nagayama, Yoshio
AU - Kawahata, Kazuo
AU - Sudo, Shigeru
AU - Yamada, Hiroshi
AU - Komori, Akio
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
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U2 - 10.1585/pfr.6.1402017
DO - 10.1585/pfr.6.1402017
M3 - Article
AN - SCOPUS:84857295292
SN - 1880-6821
VL - 6
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
IS - 2011
M1 - 1402017
ER -