Plasma and Fusion Research

Volume 9, 1201016 (2014)

Rapid Communications

Identification of Quasi-Periodic Nonlinear Waveforms in Turbulent Plasmas
Shigeru INAGAKI1,2), Yudai MIWA3), Tatsuya KOBAYASHI3), Takuma YAMADA4), Yoshihiko NAGASHIMA1,2), Tomohiro MITSUZONO3), Hiromitsu FUJINO3), Makoto SASAKI1,2), Naohiro KASUYA1,2), Maxime LESUR2), Yusuke KOSUGA5), Akihide FUJISAWA1,2), Sanae-I. ITOH1,2) and Kimitaka ITOH2,6)
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2)
Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
3)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
4)
Faculty of Arts and Science, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
5)
Institute for Advanced Study, Kyushu University, Higashi-ku, Fukuoka 812-8581, Japan
6)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
(Received 18 November 2013 / Accepted 24 January 2014 / Published 14 March 2014)

Abstract

A new method is presented for identifying waveforms of fluctuations in turbulent plasmas. The method is based on heartbeat analysis in which the convolution of a waveform is obtained by employing the phase tracking method. Phase tracking is performed by correlating raw time-series data with a template waveform; the template is evaluated through iteration procedure. The method is applied to fluctuations in a PANTA plasma, and the nonlinear waveform and its distribution of periods are obtained.

Keywords

fluctuation, phase tracking, plasma turbulence, conditional averaging

DOI: 10.1585/pfr.9.1201016

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References

  • [1] H. Arakawa et al., Plasma Phys. Control. Fusion 53, 115009 (2011).
  • [2] G.M. Friesen et al., IEEE Trans. Biomed. Eng. 37, 85 (1990).
  • [3] S. Oldenbürger et al., Plasma Phys. Control. Fusion 54, 055002 (2012).
  • [4] K. Nakanishi et al., 23rd International Toki Conference P1-40 (2013).

This paper may be cited as follows:

Shigeru INAGAKI, Yudai MIWA, Tatsuya KOBAYASHI, Takuma YAMADA, Yoshihiko NAGASHIMA, Tomohiro MITSUZONO, Hiromitsu FUJINO, Makoto SASAKI, Naohiro KASUYA, Maxime LESUR, Yusuke KOSUGA, Akihide FUJISAWA, Sanae-I. ITOH and Kimitaka ITOH, Plasma Fusion Res. 9, 1201016 (2014).