1. Spatiotemporal dynamics of high-wavenumber turbulence in a basic laboratory plasma
- Author
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Kawachi, Yuichi, Sasaki, Makoto, Kosuga, Yusuke, Terasaka, Kenichiro, Nishizawa, Takashi, Yamada, Takuma, Kasuya, Naohiro, Moon, Chanho, and Inagaki, Shigeru
- Subjects
Multidisciplinary ,Magnetically confined plasmas ,Plasma physics - Abstract
High-spatial resolution observation of high-wavenumber broadband turbulence is achieved by controlling the magnetic field to be relatively low and measuring with a azimuthally arranged multi-channel Langmuir array in a basic laboratory plasma. The observed turbulence consists of narrowband low-frequency fluctuations and broadband high-frequency turbulent fluctuations. The low-frequency fluctuations have a frequency of about 0.7 times the ion cyclotron frequency and a spatial scale of 1/10 of the ion inertial scale. In comparison, high-frequency fluctuations have a higher frequency than the ion cyclotron frequency and spatial scales of 1/10–1/40 of the ion inertial scale. Two-dimensional correlation analysis evaluates the spatial and temporal correlation lengths and reveals that the high-wavenumber broadband fluctuations have turbulent characteristics. The measurements give us further understanding of small scale turbulence in space and fusion plasmas., ミクロなプラズマの揺らぎを拡大して観る --プラズマ基礎実験の新展開--. 京都大学プレスリリース. 2022-12-22.
- Published
- 2022