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

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http://hdl.handle.net/10138/311999

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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

Julkaisun nimi: Impact of ICRF on the scrape-off layer and on plasma wall interactions : From present experiments to fusion reactor
Tekijä: JET Contributors; ASDEX Upgrade Team; Alcator C-Mod Team; EUROfusion MST1 Team; Mlynar, Jan; 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.
Muu tekijä: University of Helsinki, Department of Physics
University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Päiväys: 2019-01
Kieli: eng
Sivumäärä: 10
Kuuluu julkaisusarjaan: Nuclear Materials and Energy
ISSN: 2352-1791
URI: http://hdl.handle.net/10138/311999
Tiivistelmä: 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.
Avainsanat: 114 Physical sciences
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