Two-dimensional bispectral analysis of drift wave turbulence in a cylindrical plasma

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Bispectral analysis and multichannel measurement are becoming attractive investigation tools in plasma fluctuation studies. In the Large Mirror Device-Upgrade, the measurement of fluctuations in the ion saturation-current with a 64-channel poloidal Langmuir probe array was performed. The two-dimensional (2D) (poloidal wave number and frequency) power spectrum showed a number of pronounced peaks and broadband fluctuations in the poloidal wave number-frequency space. We applied 2D bispectral analysis, which considers both the matching conditions of poloidal wave number and frequency, to the spatiotemporal waveform, and confirmed the nonlinear couplings between coherent-coherent, coherent-broadband, and broadband-broadband fluctuation components. More than ten peaks were revealed to have as their origins only three original parent modes generated in the plasma. Comparison between the theoretical estimate and experimental observation for the bicoherence showed good agreement.

Original languageEnglish
Article number052313
JournalPhysics of Plasmas
Volume17
Issue number5
DOIs
Publication statusPublished - May 1 2010

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cylindrical plasmas
dimensional analysis
turbulence
broadband
electrostatic probes
power spectra
waveforms
mirrors
saturation
estimates
ions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Two-dimensional bispectral analysis of drift wave turbulence in a cylindrical plasma. / Yamada, Takuma; Itoh, Sanae; Shigeru, Inagaki; Nagashima, Yoshihiko; Shinohara, S.; Kasuya, Naohiro; Terasaka, Kenichiro; Kamataki, Kunihiro; Arakawa, H.; Yagi, M.; fujisawa, akihide; Itoh, K.

In: Physics of Plasmas, Vol. 17, No. 5, 052313, 01.05.2010.

Research output: Contribution to journalArticle

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AU - Shinohara, S.

AU - Kasuya, Naohiro

AU - Terasaka, Kenichiro

AU - Kamataki, Kunihiro

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