Mass dependency of high-wavenumber turbulence in a linear partially magnetized plasma

We investigated the mass dependency of the high-wavenumber turbulence, which occurs at scales smaller than the ion effective Larmor radius, in a partially magnetized plasma column. In this system, two different types of fluctuations were observed: one exhibiting a coherent discrete spectrum, while t...

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Bibliographic Details
Published in:Physics of plasmas 2024-04, Vol.31 (4)
Main Authors: Kawachi, Yuichi, Sasaki, Makoto, Nishizawa, Takashi, Kosuga, Yusuke, Terasaka, Kenichiro, Inagaki, Shigeru, Yamada, Takuma, Kasuya, Naohiro, Moon, Chanho, Nagashima, Yoshihiko, Fujisawa, Akihide
Format: Article
Language:English
Subjects:
Acoustic velocity
Bernstein waves
Broadband
Cyclotron frequency
Cyclotrons
Diamagnetism
Larmor radius
Turbulence
Wavelengths
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Summary:We investigated the mass dependency of the high-wavenumber turbulence, which occurs at scales smaller than the ion effective Larmor radius, in a partially magnetized plasma column. In this system, two different types of fluctuations were observed: one exhibiting a coherent discrete spectrum, while the other displaying a broadband continuous spectrum. The phase velocities of both types showed a similar mass dependency, approximately matching the ion sound velocity or electron diamagnetic drift velocity. Additionally, we found that the discrete spectrum has a peak interval frequency comparable to the ion cyclotron frequency, which is consistent with ion cyclotron ranges of fluctuations, including ion Bernstein waves.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0187997