Observation of nonlinear coupling between low frequency coherent modes and background turbulence in LMD-U

Tatsuya Kobayashi, Shigeru Inagaki, Hiroyuki Arakawa, Stella Oldenbürger, Makoto Sasaki Nagashima, Takuma Yamada, Satoru Sugita, Masatoshi Yagi, Naohiro Kasuya, Akihide Fujisawa, Sanae I. Itoh, Kimitaka Itoh

Research output: Contribution to journalArticle

Abstract

A solitary wave like fluctuating structure is observed in the Large Mirror Device-Upgrade (LMD-U) under relatively high neutral pressure conditions. Ion saturation current fluctuations are measured and Fourier and wavelet power spectra are calculated. Temporal behavior of fluctuation power and strength of nonlinear coupling of low frequency coherent mode and background turbulence in a specific frequency region is analyzed. This is achieved using wavelet spectral and bispectral analyses with conditional averaging.

Original languageEnglish
Article number2403082
JournalPlasma and Fusion Research
Volume6
Issue number1 SPECIAL ISSUE
DOIs
Publication statusPublished - Dec 1 2011

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turbulence
mirrors
low frequencies
power spectra
solitary waves
saturation
ions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Observation of nonlinear coupling between low frequency coherent modes and background turbulence in LMD-U. / Kobayashi, Tatsuya; Inagaki, Shigeru; Arakawa, Hiroyuki; Oldenbürger, Stella; Nagashima, Makoto Sasaki; Yamada, Takuma; Sugita, Satoru; Yagi, Masatoshi; Kasuya, Naohiro; Fujisawa, Akihide; Itoh, Sanae I.; Itoh, Kimitaka.

In: Plasma and Fusion Research, Vol. 6, No. 1 SPECIAL ISSUE, 2403082, 01.12.2011.

Research output: Contribution to journalArticle

Kobayashi, T, Inagaki, S, Arakawa, H, Oldenbürger, S, Nagashima, MS, Yamada, T, Sugita, S, Yagi, M, Kasuya, N, Fujisawa, A, Itoh, SI & Itoh, K 2011, 'Observation of nonlinear coupling between low frequency coherent modes and background turbulence in LMD-U', Plasma and Fusion Research, vol. 6, no. 1 SPECIAL ISSUE, 2403082. https://doi.org/10.1585/pfr.6.2403082
Kobayashi, Tatsuya ; Inagaki, Shigeru ; Arakawa, Hiroyuki ; Oldenbürger, Stella ; Nagashima, Makoto Sasaki ; Yamada, Takuma ; Sugita, Satoru ; Yagi, Masatoshi ; Kasuya, Naohiro ; Fujisawa, Akihide ; Itoh, Sanae I. ; Itoh, Kimitaka. / Observation of nonlinear coupling between low frequency coherent modes and background turbulence in LMD-U. In: Plasma and Fusion Research. 2011 ; Vol. 6, No. 1 SPECIAL ISSUE.
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