Convergence study of bispectral analysis in experiments of high temperature plasmas

Y. Nagashima, S. I. Itoh, M. Yagi, K. Itoh, A. Fujisawa, K. Hoshino, K. Shinohara, K. Uehara, Y. Kusama, A. Ejiri, Y. Takase

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13 Citations (Scopus)

Abstract

A convergence study of bispectral analysis on toroidal plasma turbulence is presented with a theoretical estimate of bicoherence for the system of the drift wave and zonal flow. Examples are chosen from the analysis of floating potential fluctuation in the edge region of the JFT-2M tokamak. The convergence properties of the bispectral functions are clarified for an oscillatory branch of zonal flow (or geodesic acoustic mode) and drift waves. The total squared bicoherence or the biphase converges inversely proportional to the realization number or to the square root of the realization number, respectively. The numbers of realizations to qualitatively converge and obtain a quantitatively significant value of bicoherence are discussed for the drift wave fluctuations and for the zonal flow.

Original languageEnglish
Article number045110
JournalReview of Scientific Instruments
Volume77
Issue number4
DOIs
Publication statusPublished - May 15 2006

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high temperature plasmas
Plasmas
Plasma turbulence
plasma turbulence
toroidal plasmas
Experiments
Temperature
floating
acoustics
estimates

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Convergence study of bispectral analysis in experiments of high temperature plasmas. / Nagashima, Y.; Itoh, S. I.; Yagi, M.; Itoh, K.; Fujisawa, A.; Hoshino, K.; Shinohara, K.; Uehara, K.; Kusama, Y.; Ejiri, A.; Takase, Y.

In: Review of Scientific Instruments, Vol. 77, No. 4, 045110, 15.05.2006.

Research output: Contribution to journalArticle

Nagashima, Y, Itoh, SI, Yagi, M, Itoh, K, Fujisawa, A, Hoshino, K, Shinohara, K, Uehara, K, Kusama, Y, Ejiri, A & Takase, Y 2006, 'Convergence study of bispectral analysis in experiments of high temperature plasmas', Review of Scientific Instruments, vol. 77, no. 4, 045110. https://doi.org/10.1063/1.2194016
Nagashima, Y. ; Itoh, S. I. ; Yagi, M. ; Itoh, K. ; Fujisawa, A. ; Hoshino, K. ; Shinohara, K. ; Uehara, K. ; Kusama, Y. ; Ejiri, A. ; Takase, Y. / Convergence study of bispectral analysis in experiments of high temperature plasmas. In: Review of Scientific Instruments. 2006 ; Vol. 77, No. 4.
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