Plasma and Fusion Research

Volume 12, 1201034 (2017)

Rapid Communications

Nonlinear Coupling of Drift Waves and High Frequency Fluctuation on PANTA
Kazunobu HASAMADA, Yusuke KOSUGA1,2), Fumiyoshi KIN, Sigeru INAGAKI1,2), Yoshihiko NAGASHIMA1,2), Tatsuya KOBAYASHI3), Makoto SASAKI1,2), Naohiro KASUYA1,2), Kotaro YAMASAKI1), Sanae-I. ITOH1,2), Kimitaka ITOH2,3,4) and Akihide FUJISAWA1,2)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
2)
Research Center for Plasma Turbulence, Kyushu University, Fukuoka 816-8580, Japan
3)
National Institute for Fusion Science, Toki 509-5202, Japan
4)
Institute of Science and Technology Research, Chubu University, Kasugai, Aichi 487-8501, Japan
(Received 11 May 2017 / Accepted 23 July 2017 / Published 30 August 2017)

Abstract

A new type of nonlinear coupling among multi-time scale of fluctuations is observed on the linear plasma device, PANTA. The low frequency drift waves (DWs), a few kHz and a high frequency fluctuation (the HF fluctuation) (∼ 30 kHz) are simultaneously observed. These fluctuations nonlinearly couple with each other confirmed by bi-coherence analysis. The characteristics of HF fluctuation are also discussed.

Keywords

nonlinear coupling, multi-time scale, drift wave

DOI: 10.1585/pfr.12.1201034

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