[Table of Contents]

Plasma and Fusion Research

Volume 8, 1202173 (2013)

Rapid Communications

Higher Harmonics in a Perturbative Transport Experiment
Shigeru INAGAKI1,2), Sanae-I. ITOH1,2), Kimitaka ITOH2,3), Naohiro KASUYA1,2), Tatsuya KOBAYASHI4), Akihide FUJISAWA1,2), Tokihiko TOKUZAWA3), Katsumi IDA2,3), Shin KUBO3), Takashi SHIMOZUMA3), Naoki TAMURA3), Hayato TSUCHIYA3), Yoshio NAGAYAMA3), Kazuo KAWAHATA3), Hiroshi YAMADA3), Akio KOMORI3) and LHD Experiment Group
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)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
4)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
(Received 10 September 2013 / Accepted 29 October 2013 / Published 27 December 2013)

Abstract

We have used the convolution method to obtain higher harmonics of the temperature perturbation in a heating modulation experiment on LHD plasma. In comparison with predictions based on the diffusive model, amplitudes of higher harmonics (such as the seventh) decayed much more slowly as they propagated radially. Changes in the time derivative of temperature at the onset and turning-off of heating power remained much sharper after radial propagation than those predicted by the diffusion model.

Keywords

heat-pulse propagation, higher harmonics, nondiffusive transport

DOI: 10.1585/pfr.8.1202173

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References

  • [1] S. Inagaki et al., Nucl. Fusion 53, 113006 (2013).
  • [2] S. Inagaki et al., Plasma Fusion Res. (2013) in press
  • [3] M. Wadati, Nonlinear Waves, Chapter 2 (in Japanese) (Iwanami, 1992).
  • [4] A. Iiyoshi et al., Nucl. Fusion 39, 1245 (1999).
  • [5] S. Inagaki et al., Nucl. Fusion 46, 133 (2006).

This paper may be cited as follows:

Shigeru INAGAKI, Sanae-I. ITOH, Kimitaka ITOH, Naohiro KASUYA, Tatsuya KOBAYASHI, Akihide FUJISAWA, Tokihiko TOKUZAWA, Katsumi IDA, Shin KUBO, Takashi SHIMOZUMA, Naoki TAMURA, Hayato TSUCHIYA, Yoshio NAGAYAMA, Kazuo KAWAHATA, Hiroshi YAMADA, Akio KOMORI and LHD Experiment Group, Plasma Fusion Res. 8, 1202173 (2013).