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

JET Contributors; Bobkov, V.; Aguiam, D.; Bilato, R.; Brezinsek, S.; Colas, L.; Czarnecka, A.; Dumortier, P.; Dux, R.; Faugel, H.; Funfgelder, H.; Jacquetg, Ph; Kaltenbach, A.; Krivska, A.; Klepper, C. C.; Lerche, E.; Lin, Y.; Milanesio, D.; Maggiora, R.; ... mehr


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<P$_{cen}$/P$_{total}$<0.8. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000119909
Veröffentlicht am 29.05.2020
DOI: 10.1016/j.nme.2018.11.017
Zitationen: 36
Web of Science
Zitationen: 33
Zitationen: 37
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Thermofluidik (IATF)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2019
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000119909
Erschienen in Nuclear materials and energy
Verlag Elsevier
Band 18
Seiten 131-140
Bemerkung zur Veröffentlichung Kollaboration: ASDEX Upgrade Team ; Alcator C-Mod Team ; EUROfusion MST1 Team
Schlagwörter ICRF, RF sheath, Power balance, Three-strap, 3-strap, ASDEX upgrade, JET-ILW, A2 antenna, ILA, Sputtering, Field-aligned antenna, Alcator C-Mod
Nachgewiesen in Scopus
Web of Science
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