Plasma and Fusion Research

Volume 16, 2402031 (2021)

Regular Articles

Correlation Analysis between Density and Magnetic Field Low Frequency Fluctuations in Improved Confinement Mode on LHD
Wenqing HU1), Tatsuya KOBAYASHI1,2), Yasuhiro SUZUKI1,2), Mikiro YOSHINUMA2), Tokihiko TOKUZAWA1,2) and Katsumi IDA2)
1)
The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
2)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
(Received 26 November 2020 / Accepted 25 January 2021 / Published 19 March 2021)

Abstract

A plasma density fluctuation signal was measured by the recently-installed Beam Emission Spectroscopy (BES). A time-dependent analysis was performed for a discharge in the Large Helical Device (LHD) and compared with the magnetic fluctuation. While the fundamental frequency peak shows a high correlation between the density fluctuation and the magnetic fluctuation, the higher harmonic components have smaller or even negligible correlation. As a possible mechanism that makes the density fluctuation and the magnetic fluctuation different, the relation between the MHD mode and the transport is discussed.

Keywords

Large Helical Device, Beam Emission Spectroscopy, L-H transition, magnetohydrodynamic fluctuation, profile saturation

DOI: 10.1585/pfr.16.2402031

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