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Impact of ICRF on the scrape-off layer and on plasma wall interactions: From present experiments to fusion reactor

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Title: Impact of ICRF on the scrape-off layer and on plasma wall interactions: From present experiments to fusion reactor
Authors: V. Bobkov, D. Aguiam, R. Bilato, S. Brezinsek, L. Colas, A. Czarnecka, P. Dumortier, R. Dux, H. Faugel, H. Fünfgelder, Ph. Jacquet, A. Kallenbach, A. Krivska, C.C. Klepper, E. Lerche, Y. Lin, D. Milanesio, R. Maggiora, I. Monakhov, R. Neu, J.-M. Noterdaeme, R. Ochoukov, Th. Pütterich, M. Reinke, W. Tierens, A. Tuccilo, O. Tudisco, D. Van Eester, J. Wright, S. Wukitch, W. Zhang
Source: Nuclear Materials and Energy, Vol 18, Iss , Pp 131-140 (2019)
Publisher Information: Elsevier, 2019.
Publication Year: 2019
Collection: LCC:Nuclear engineering. Atomic power
Subject Terms: Nuclear engineering. Atomic power, TK9001-9401
More Details: Recent achievements in studies of the effects of ICRF (Ion Cyclotron Range of Frequencies) power on the SOL (Scrape-Off Layer) and PWI (Plasma Wall Interactions) in ASDEX Upgrade (AUG), Alcator C-Mod, and JET-ILW are reviewed. Capabilities to diagnose and model the effect of DC biasing and associated impurity production at active antennas and on magnetic field connections to antennas are described. The experiments show that ICRF near-fields can lead not only to E × B convection, but also to modifications of the SOL density, which for Alcator C-Mod are limited to a narrow region near antenna. On the other hand, the SOL density distribution along with impurity sources can be tailored using local gas injection in AUG and JET-ILW with a positive effect on reduction of impurity sources. The technique of RF image current cancellation at antenna limiters was successfully applied in AUG using the 3-strap AUG antenna and extended to the 4-strap Alcator C-Mod field-aligned antenna. Multiple observations confirmed the reduction of the impact of ICRF on the SOL and on total impurity production when the ratio of the power of the central straps to the total antenna power is in the range 0.6
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2352-1791
Relation: http://www.sciencedirect.com/science/article/pii/S2352179118301091; https://doaj.org/toc/2352-1791
DOI: 10.1016/j.nme.2018.11.017
Access URL: https://doaj.org/article/1ada1c533aae4148acb40564d1f36fda
Accession Number: edsdoj.1ada1c533aae4148acb40564d1f36fda
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  Data: Nuclear Materials and Energy, Vol 18, Iss , Pp 131-140 (2019)
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  Data: Recent achievements in studies of the effects of ICRF (Ion Cyclotron Range of Frequencies) power on the SOL (Scrape-Off Layer) and PWI (Plasma Wall Interactions) in ASDEX Upgrade (AUG), Alcator C-Mod, and JET-ILW are reviewed. Capabilities to diagnose and model the effect of DC biasing and associated impurity production at active antennas and on magnetic field connections to antennas are described. The experiments show that ICRF near-fields can lead not only to E × B convection, but also to modifications of the SOL density, which for Alcator C-Mod are limited to a narrow region near antenna. On the other hand, the SOL density distribution along with impurity sources can be tailored using local gas injection in AUG and JET-ILW with a positive effect on reduction of impurity sources. The technique of RF image current cancellation at antenna limiters was successfully applied in AUG using the 3-strap AUG antenna and extended to the 4-strap Alcator C-Mod field-aligned antenna. Multiple observations confirmed the reduction of the impact of ICRF on the SOL and on total impurity production when the ratio of the power of the central straps to the total antenna power is in the range 0.6
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