Experimental study of driftwave turbulence in linear plasmas

Takuma Yamada, Sanae Itoh, Takashi Maruta, Naohiro Kasuya, Shunjiro Shinohara, Yoshihiko Nagashima, Masatoshi Yagi, Kenichiro Terasaka, Inagaki Shigeru, Yoshinobu Kawai, Masayuki Fukao, akihide fujisawa, Kimitaka Itoh

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Linear plasmas allow multi-point, low-temperature measurements with Langmuir probes. We measured ion saturation-current fluctuations of a Large Mirror Device-Upgrade linear plasma using a poloidal Langmuir probe array. By varying the discharge conditions, the spatiotemporal behavior showed a change from a coherent sine wave to a turbulent waveform through a periodic, modulated sine wave. The two-dimensional (poloidal wave number and frequency) power spectrum for each regime showed a single fluctuation peak, a peak and its harmonics, and a number of peaks in the poloidal wave number-frequency space. Bi-spectral analysis was performed for the turbulent regime, and showed the existence of nonlinear couplings among fluctuation peaks and broadband components.

Original languageEnglish
Article number044
JournalPlasma and Fusion Research
Volume3
DOIs
Publication statusPublished - Jan 1 2008

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turbulence
sine waves
electrostatic probes
spectrum analysis
temperature measurement
power spectra
waveforms
mirrors
broadband
saturation
harmonics
ions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Experimental study of driftwave turbulence in linear plasmas. / Yamada, Takuma; Itoh, Sanae; Maruta, Takashi; Kasuya, Naohiro; Shinohara, Shunjiro; Nagashima, Yoshihiko; Yagi, Masatoshi; Terasaka, Kenichiro; Shigeru, Inagaki; Kawai, Yoshinobu; Fukao, Masayuki; fujisawa, akihide; Itoh, Kimitaka.

In: Plasma and Fusion Research, Vol. 3, 044, 01.01.2008.

Research output: Contribution to journalArticle

Yamada, Takuma ; Itoh, Sanae ; Maruta, Takashi ; Kasuya, Naohiro ; Shinohara, Shunjiro ; Nagashima, Yoshihiko ; Yagi, Masatoshi ; Terasaka, Kenichiro ; Shigeru, Inagaki ; Kawai, Yoshinobu ; Fukao, Masayuki ; fujisawa, akihide ; Itoh, Kimitaka. / Experimental study of driftwave turbulence in linear plasmas. In: Plasma and Fusion Research. 2008 ; Vol. 3.
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AU - Yamada, Takuma

AU - Itoh, Sanae

AU - Maruta, Takashi

AU - Kasuya, Naohiro

AU - Shinohara, Shunjiro

AU - Nagashima, Yoshihiko

AU - Yagi, Masatoshi

AU - Terasaka, Kenichiro

AU - Shigeru, Inagaki

AU - Kawai, Yoshinobu

AU - Fukao, Masayuki

AU - fujisawa, akihide

AU - Itoh, Kimitaka

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