Spatiotemporal Behavior of Drift Waves in LMD-U

• Published in: Plasma and Fusion Research Vol. 3; p. S1021
• Main Authors: YAMADA, Takuma, ITOH, Sanae -I., TERASAKA, Kenichiro, KASUYA, Naohiro, NAGASHIMA, Yoshihiko, SHINOHARA, Shunjiro, MARUTA, Takashi, YAGI, Masatoshi, INAGAKI, Shigeru, KAWAI, Yoshinobu, FUJISAWA, Akihide, ITOH, Kimitaka
• Format: Journal Article
• Language: English
• Published: The Japan Society of Plasma Science and Nuclear Fusion Research 2008
• Subjects: broadband fluctuation; drift wave; linear plasma; quasi-two-dimensional structure; turbulence
• ISSN: 1880-6821; 1880-6821
• DOI: 10.1585/pfr.3.S1021

In the LMD-U linear magnetized plasma, fluctuation measurements have been performed with multi-channel poloidal Langmuir probe arrays to investigate the spatiotemporal behaviors of drift wave turbulence. Two-dimensional (poloidal mode number-frequency) power spectrum showed not only fluctuation peaks but also the existence of a broadband fluctuation. The broadband fluctuation developed at high poloidal mode number and high frequency regions and not along the linear dispersion relation curve of drift wave modes. It showed shorter correlation time and poloidal length than the peaked fluctuations. Two-dimensional axial coherence was measured with two poloidal probe arrays separated in the axial direction. The axial coherence was strong for both the broadband fluctuation and peak fluctuations, suggesting the quasi-two-dimensional structure of the drift wave turbulence.