[Table of Contents]

Plasma and Fusion Research

Volume 9, 1202052 (2014)

Rapid Communications

Higher Harmonics in the Perturbative Transport Study in TJ-II ECH Plasma
Shigeru INAGAKI1,2), Sanae-I. ITOH1,2), Kimitaka ITOH2,3), Katsumi IDA2,3), Daniel LÓPEZ-BRUNA4), Maria A. OCHAND4), Teresa ESTRADA4), Boudewijn Ph. VAN MILLIGEN4), Carlos HIDALGO4), Naohiro KASUYA1,2) and TJ-II team4)
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2)
Research Center for Plasma Turbulence, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
3)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
4)
Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain
(Received 18 November 2013 / Accepted 14 March 2014 / Published 7 May 2014)

Abstract

We analyzed the higher harmonics of temperature perturbation in the modulated electron cyclotron heating experiment on TJ-II plasma. The higher harmonics (e.g., 5th harmonic) exhibited significantly weaker decay in amplitude as they propagated in radius as compared with the prediction by diffusive model. The change in the time derivative of temperature at the onset (and turning-off) of the heating power propagates in radius with very little temporal smoothening.

Keywords

heat pulse propagation, higher harmonics, nondiffusive transport

DOI: 10.1585/pfr.9.1202052

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References

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This paper may be cited as follows:

Shigeru INAGAKI, Sanae-I. ITOH, Kimitaka ITOH, Katsumi IDA, Daniel LÓPEZ-BRUNA, Maria A. OCHAND, Teresa ESTRADA, Boudewijn Ph. VAN MILLIGEN, Carlos HIDALGO, Naohiro KASUYA and TJ-II team, Plasma Fusion Res. 9, 1202052 (2014).