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Author Antar, G. ♦ Assas, S. ♦ Bobkov, V. ♦ Noterdaeme, J. -M. ♦ Wolfrum, E. ♦ Herrmann, A. ♦ Rohde, V.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ASDEX TOKAMAK ♦ CHARGED-PARTICLE TRANSPORT ♦ DISTRIBUTION FUNCTIONS ♦ EDGE LOCALIZED MODES ♦ FLUCTUATIONS ♦ H-MODE PLASMA CONFINEMENT ♦ ICR HEATING ♦ PLASMA DENSITY ♦ PLASMA SCRAPE-OFF LAYER ♦ TURBULENCE ♦ BOUNDARY LAYERS ♦ CLOSED PLASMA DEVICES ♦ CONFINEMENT ♦ FUNCTIONS ♦ HEATING ♦ HIGH-FREQUENCY HEATING ♦ INSTABILITY ♦ LAYERS ♦ MAGNETIC CONFINEMENT ♦ PLASMA CONFINEMENT ♦ PLASMA HEATING ♦ PLASMA INSTABILITY ♦ PLASMA MACROINSTABILITIES ♦ RADIATION TRANSPORT ♦ THERMONUCLEAR DEVICES ♦ TOKAMAK DEVICES ♦ VARIATIONS
Abstract Turbulence properties in the scrape-off layer (SOL) in the presence of ion cyclotron frequency heating (ICRH) are compared to instances where it is absent. The discharges are all in a high-confinement mode (H-mode) regime. During ICRH, the SOL plasma density increases whereas turbulence large-scale and convective structures are shown to be suppressed. The probability distribution function is thus recorded to be closer to a Gaussian, and a net decrease in the low-frequency density fluctuations is reflected in the power spectra. Consequently, the level of turbulent fluctuations decreases significantly. Turbulence suppression is also reported during edge localized modes (ELMs) where both the ELMs-induced transport and duration are strongly affected. The increase of neutrals by gas puffing did not alter this behavior. We deduce that ICRH can be used as to suppress convective transport and reduce the ELM's amplitude.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-10-15
Publisher Place United States
Journal Physical Review Letters
Volume Number 105
Issue Number 16


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