A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma

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

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In a high-density plasma produced by helicon waves in a linear device, a change from the coherent to broadband density fluctuations was observed on increasing the magnetic field. The coherent mode exhibited the drift wave features, and a steady oscillation state was observed. When the magnetic field was increased, the fluctuation level increased, and the higher azimuthal Fourier components were excited. When the spectrum became broad at the higher magnetic field, the behavior of the azimuthal structure became complex and changed rapidly with time. The analysis performed using the movable probe array (48ch.-probe) decomposed the short-lived structure into poloidal mode-frequency space and indicated mode-mode coupling in the broad-band spectrum.

Original languageEnglish
Article number031
JournalPlasma and Fusion Research
Volume2
DOIs
Publication statusPublished - Jan 1 2007

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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