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

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dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Materials Physics en
dc.contributor University of Helsinki, Materials Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author JET Contributors
dc.contributor.author ASDEX Upgrade Team
dc.contributor.author Alcator C-Mod Team
dc.contributor.author EUROfusion MST1 Team
dc.contributor.author Mlynar, Jan
dc.contributor.author Ahlgren, T.
dc.contributor.author Aho-Mantila, L.
dc.contributor.author Airila, M.
dc.contributor.author Björkas, C.
dc.contributor.author Lahtinen, A.
dc.contributor.author Nordlund, K.
dc.contributor.author Safi, E.
dc.contributor.author Sipila, S. K.
dc.contributor.author Asunta, O.
dc.contributor.author Groth, M.
dc.contributor.author Hakola, A.
dc.contributor.author Karhunen, J.
dc.contributor.author Koivuranta, S.
dc.contributor.author Kurki-Suonio, T.
dc.contributor.author Lomanowski, B.
dc.contributor.author Lonnroth, J.
dc.contributor.author Salmi, A.
dc.contributor.author Santala, M. I. K.
dc.contributor.author Varje, J.
dc.contributor.author Siren, P.
dc.contributor.author Likonen, J.
dc.contributor.author Jarvinen, A.
dc.contributor.author Bobkov, V.
dc.date.accessioned 2020-02-20T08:46:01Z
dc.date.available 2020-02-20T08:46:01Z
dc.date.issued 2019-01
dc.identifier.citation JET Contributors , ASDEX Upgrade Team , Alcator C-Mod Team , EUROfusion MST1 Team , Mlynar , J , Ahlgren , T , Aho-Mantila , L , Airila , M , Björkas , C , Lahtinen , A , Nordlund , K , Safi , E , Sipila , S K , Asunta , O , Groth , M , Hakola , A , Karhunen , J , Koivuranta , S , Kurki-Suonio , T , Lomanowski , B , Lonnroth , J , Salmi , A , Santala , M I K , Varje , J , Siren , P , Likonen , J , Jarvinen , A & Bobkov , V 2019 , ' Impact of ICRF on the scrape-off layer and on plasma wall interactions : From present experiments to fusion reactor ' , Nuclear Materials and Energy , vol. 18 , pp. 131-140 . https://doi.org/10.1016/j.nme.2018.11.017 en
dc.identifier.issn 2352-1791
dc.identifier.other PURE: 132382820
dc.identifier.other PURE UUID: d38b26d0-d651-40eb-b260-dd10fad44739
dc.identifier.other WOS: 000460107500024
dc.identifier.other ORCID: /0000-0001-6244-1942/work/70945577
dc.identifier.other ORCID: /0000-0002-0213-7305/work/70947094
dc.identifier.other ORCID: /0000-0002-4786-5234/work/70950472
dc.identifier.uri http://hdl.handle.net/10138/311999
dc.description.abstract 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 x 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. Near-field calculations indicate that this fairly robust technique can be applied to the ITER ICRF antenna, enabling the mode of operation with reduced PWI. On the contrary, for the A2 antenna in JET-ILW the technique is hindered by RF sheaths excited at the antenna septum. Thus, in order to reduce the effect of ICRF power on PWI in a future fusion reactor, the antenna design has to be optimized along with design of plasmafacing components. en
dc.format.extent 10
dc.language.iso eng
dc.relation.ispartof Nuclear Materials and Energy
dc.rights en
dc.subject 114 Physical sciences en
dc.title Impact of ICRF on the scrape-off layer and on plasma wall interactions : From present experiments to fusion reactor en
dc.type Article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.1016/j.nme.2018.11.017
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion
dc.contributor.pbl
dc.contributor.pbl

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