Self-nonlinear coupling of long-range temperature fluctuation in Toroidal plasma

T. Kobayashi, Inagaki Shigeru, Sanae Itoh, K. Itoh, S. Oldenbürger, akihide fujisawa, Yoshihiko Nagashima, K. Ida, H. Tsuchiya, Y. Nagayama, K. Kawahata, H. Yamada

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper proposes a clever usage of bispectral analysis for extracting or reconstructing a quasi-coherent and quasi-periodic structural evolution of plasma fluctuations. The method has been applied on electron temperature fluctuation signals measured with a multi-point electron cyclotron emission (ECE) radiometer in the Large Helical Device (LHD). The method successfully reconstructs the averaged spatiotemporal evolution of fluctuating coherent structure (Inagaki et al 2011 Phys. Rev. Lett. 107 115001), while the structure is buried in (or comparable in power to) background fluctuations. The bicoherence analysis has found the faint fluctuating structure consisting of a fundamental mode and the harmonic modes from the existence of significant couplings between them. The reconstructed spatiotemporal structure with the proposed method is compared with that obtained with the lock-in (conditional) average. Three cases of spatiotemporal evolution of the non-sinusoidal waveform are presented.

Original languageEnglish
Article number115004
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number11
DOIs
Publication statusPublished - Nov 1 2012

Fingerprint

toroidal plasmas
Electron temperature
Cyclotrons
Radiometers
Plasmas
Electrons
radiometers
Temperature
cyclotrons
temperature
waveforms
electron energy
harmonics
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Self-nonlinear coupling of long-range temperature fluctuation in Toroidal plasma. / Kobayashi, T.; Shigeru, Inagaki; Itoh, Sanae; Itoh, K.; Oldenbürger, S.; fujisawa, akihide; Nagashima, Yoshihiko; Ida, K.; Tsuchiya, H.; Nagayama, Y.; Kawahata, K.; Yamada, H.

In: Plasma Physics and Controlled Fusion, Vol. 54, No. 11, 115004, 01.11.2012.

Research output: Contribution to journalArticle

Kobayashi, T, Shigeru, I, Itoh, S, Itoh, K, Oldenbürger, S, fujisawa, A, Nagashima, Y, Ida, K, Tsuchiya, H, Nagayama, Y, Kawahata, K & Yamada, H 2012, 'Self-nonlinear coupling of long-range temperature fluctuation in Toroidal plasma', Plasma Physics and Controlled Fusion, vol. 54, no. 11, 115004. https://doi.org/10.1088/0741-3335/54/11/115004
Kobayashi, T. ; Shigeru, Inagaki ; Itoh, Sanae ; Itoh, K. ; Oldenbürger, S. ; fujisawa, akihide ; Nagashima, Yoshihiko ; Ida, K. ; Tsuchiya, H. ; Nagayama, Y. ; Kawahata, K. ; Yamada, H. / Self-nonlinear coupling of long-range temperature fluctuation in Toroidal plasma. In: Plasma Physics and Controlled Fusion. 2012 ; Vol. 54, No. 11.
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