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Title: Convective Transport Suppression in the Scrape-Off Layer Using Ion Cyclotron Resonance Heating on the ASDEX Upgrade Tokamak

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.

Authors:
 [1]; ; ; ; ; ;  [2]
  1. American University of Beirut, Riad el-Solh, Beirut 1107-2020 (Lebanon)
  2. Max-Planck Institut fuer Plasmaphysik, Boltzmannstrasse 2, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
21467027
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 16; Other Information: DOI: 10.1103/PhysRevLett.105.165001; (c) 2010 American Institute of Physics; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
70 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

Citation Formats

Antar, G, Assas, S, Bobkov, V, Noterdaeme, J -M, Wolfrum, E, Herrmann, A, and Rohde, V. Convective Transport Suppression in the Scrape-Off Layer Using Ion Cyclotron Resonance Heating on the ASDEX Upgrade Tokamak. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.105.165001.
Antar, G, Assas, S, Bobkov, V, Noterdaeme, J -M, Wolfrum, E, Herrmann, A, & Rohde, V. Convective Transport Suppression in the Scrape-Off Layer Using Ion Cyclotron Resonance Heating on the ASDEX Upgrade Tokamak. United States. doi:10.1103/PHYSREVLETT.105.165001.
Antar, G, Assas, S, Bobkov, V, Noterdaeme, J -M, Wolfrum, E, Herrmann, A, and Rohde, V. Fri . "Convective Transport Suppression in the Scrape-Off Layer Using Ion Cyclotron Resonance Heating on the ASDEX Upgrade Tokamak". United States. doi:10.1103/PHYSREVLETT.105.165001.
@article{osti_21467027,
title = {Convective Transport Suppression in the Scrape-Off Layer Using Ion Cyclotron Resonance Heating on the ASDEX Upgrade Tokamak},
author = {Antar, G and Assas, S and Bobkov, V and Noterdaeme, J -M and Wolfrum, E and Herrmann, A and Rohde, V},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.105.165001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 16,
volume = 105,
place = {United States},
year = {2010},
month = {10}
}