Experimental study of driftwave turbulence in linear plasmas

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

Research output: Contribution to journalArticlepeer-review

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 - 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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