Abstract
Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.
| Original language | English |
|---|---|
| Article number | 034501 |
| Journal | journal of the physical society of japan |
| Volume | 81 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 1 2012 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas. / Shigeru, Inagaki; Kobayashi, Tatsuya; Itoh, Kimitaka; Tokuzawa, Tokihiko; Itoh, Sanae; Ida, Katsumi; Tamura, Naoki; Kasuya, Naoyuki; fujisawa, akihide; Kubo, Shin; Shimozuma, Takashi; Yagi, Masatoshi; Tanaka, Kenji; Nagayama, Yoshio; Kawahata, Kazuo; Yamada, Hiroshi.
In: journal of the physical society of japan, Vol. 81, No. 3, 034501, 01.03.2012.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas
AU - Shigeru, Inagaki
AU - Kobayashi, Tatsuya
AU - Itoh, Kimitaka
AU - Tokuzawa, Tokihiko
AU - Itoh, Sanae
AU - Ida, Katsumi
AU - Tamura, Naoki
AU - Kasuya, Naoyuki
AU - fujisawa, akihide
AU - Kubo, Shin
AU - Shimozuma, Takashi
AU - Yagi, Masatoshi
AU - Tanaka, Kenji
AU - Nagayama, Yoshio
AU - Kawahata, Kazuo
AU - Yamada, Hiroshi
PY - 2012/3/1
Y1 - 2012/3/1
N2 - Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.
AB - Macro-scale temperature fluctuations, which have long radial correlation length (of the order of the plasma radius), have been discovered on Large Helical Device (LHD). In this paper, non-linear coupling between the long-range fluctuations and microscopic fluctuations is investigated using cross bi-coherence analysis. The significant cross bicoherence between long-range fluctuations and micro-fluctuations is observed in the range of frequency f < 100kHz, where f is the frequency of microscopic fluctuations. It is found that the squared bi-coherence and bi-phase for this three-wave coupling is weakly dependent on the frequency of microscopic fluctuations. These observations demonstrate that the microscopic fluctuations are coherently interacting with long-range fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=84863229173&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863229173&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.81.034501
DO - 10.1143/JPSJ.81.034501
M3 - Article
AN - SCOPUS:84863229173
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
M1 - 034501
ER -