Properties of Intermittent Bursts in Edge Plasma of LHD
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概要
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In edge plasma in the Large Helical Device (LHD), incoherent fluctuations with intermittent density bursts were observed with a two-dimensional lithium beam probe that can measure electron density and its fluctuation two-dimensionally. Statistical analysis using a probability denstiy function (PDF) showed that those bursts have the characteristics of blobs, which have been observed in tokamaks. Two-dimensional PDF analysis indicates that the blobs originate in the ergodic layer outside the last closed flux surface and move to the outer region. Wavelet analysis showed that the direction of blob propagation is not always outward but is sometimes in arbitrary directions. These characteristics may be a result of the complicated magnetic field structure of the heliotron configuration.
著者
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KOMORI Akio
National Insitute for Fusion Science
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YAMADA Hiroshi
National Insitute for Fusion Science
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MORISAKI Tomohiro
National Insitute for Fusion Science
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TSUCHIYA Hayato
National Institute for Fusion Science, Toki 509-5292, Japan
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YAMADA Hiroshi
National Institute for Fusion Science, Toki 509-5292, Japan
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MORISAKI Tomohiro
National Institute for Fusion Science, Toki 509-5292, Japan
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TSUCHIYA Hayato
National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
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BUDAEV Viatcheslav
Nuclear Fusion Institute, RRC Kurchatov Institute, 123182, Kurchatov Sq.1, Moscow, Russia
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TSUCHIYA Hayato
National Institute for Fusion Science
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