Nonlinear mode couplings in a cylindrical magnetized plasma

Takuma Yamada, Sanae I. Itoh, Shigeru Inagaki, Yoshihiko Nagashima, Shunjiro Shinohara, Naohiro Kasuya, Kenichiro Terasaka, Kunihiro Kamataki, Hiroyuki Arakawa, Masatoshi Yagi, Akihide Fujisawa, Kimitaka Itoh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Nonlinear mode couplings in plasma turbulence generate mesoscale global structures, such as zonal flows and streamers. A streamer is a poloidally localized structure that is radially elongated. In the Large Mirror Device-Upgrade, a streamer structure was observed in the ion saturation-current fluctuation measured with a 64- channel poloidal Langmuir probe array. The bunching of waves was poloidally localized and rotated slowly in the ion diamagnetic direction. The frequency and poloidal mode number of its envelope corresponded to one particular mode, which was strongly coupled with many other modes. By calculating the radial biphase profile of three pronounced modes, including the particular mode, the streamer structure was confirmed to be radially elongated.

Original languageEnglish
Article numberS2016
JournalPlasma and Fusion Research
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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