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

研究成果: ジャーナルへの寄稿学術誌査読

14 被引用数 (Scopus)


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.

ジャーナルReview of Scientific Instruments
出版ステータス出版済み - 2006

!!!All Science Journal Classification (ASJC) codes

  • 器械工学


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