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The role of the plasma current in turbulence decrease during lower hybrid current drive
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SYSNO ASEP 0509309 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The role of the plasma current in turbulence decrease during lower hybrid current drive Author(s) Antar, G. (LB)
Ekedahl, A. (FR)
Goniche, M. (FR)
Asghar, A. (LB)
Žáček, František (UFP-V) RIDNumber of authors 5 Article number 032307 Source Title Physics of Plasmas - ISSN 1070-664X
Roč. 24, č. 3 (2017)Number of pages 6 s. Language eng - English Country US - United States Keywords scrape-off layer ; transport ; front Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000397872500032 EID SCOPUS 85016139828 DOI 10.1063/1.4978486 Annotation The interaction of radio frequency (RF) waves with edge turbulence has resurfaced after the results obtained on many tokamaks showing that edge turbulence decreases when the ion cyclotron frequency heating (ICRH) is switched on. Using the lower hybrid (LH) waves to drive current into tokamak plasmas, this issue presented contradicting results with some tokamaks (FTU & HT-7) showing a net decrease, similar to the ICRH results, and others (Tore Supra) did not. In this article, these apparent discrepancies among tokamaks and RF wave frequencies are removed. It is found that turbulence large-scale structures in the scrape-off layer decrease at high enough plasma currents (I-p) on the Tore Supra tokamak. We distinguish three regimes: At low I-p's, no modification is detected with statistical properties of turbulence similar to ohmic plasmas even with P-LH reaching 4.8MW. At moderate plasma currents, turbulence properties are modified only at a high LH power. At high plasma currents, turbulent large scales are reduced to values smaller than 1 cm, and this is accompanied by a net decrease in the level of turbulence of about 30% even with a moderate LH power. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://aip.scitation.org/doi/10.1063/1.4978486
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