Plasma and Fusion Research

Volume 13, 3401105 (2018)

Regular Articles

Determination of Spatiotemporal Structure of Fluctuations by Statistical Averaging Method
Yuichi KAWACHI, Sigeru INAGAKI1,2), Kentaro TOMITA, Kotaro YAMASAKI1), Fumiyoshi KIN, Yusuke KOSUGA1,2), Makoto SASAKI1,2), Yoshihiko NAGASHIMA1,2), Naohiro KASUYA1,2), Kazunobu HASAMADA, Boyu ZHANG and Akihide FUJISAWA1,2)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
1)
Research Center for Plasma Turbulence, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
2)
Research Institution for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
(Received 29 January 2018 / Accepted 23 July 2018 / Published 27 August 2018)

Abstract

Spatiotemporal structure of fluctuation with 11 kHz excited in a linear magnetized plasma was observed in details by applying pattern recognition method based on statistical averaging. Statistical behaviors of instantaneous period of the fluctuation and the temporal behavior of the radial profile of the fluctuation are clarified. Two-dimensional structure of the fluctuation is reconstructed and distortion of the wave-front of the fluctuation was inferred.

Keywords

non-linear wave, plasma turbulence, conditional averaging, phase tracking, spatiotemporal structure

DOI: 10.1585/pfr.13.3401105

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