Jena 2013 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Poster: Magnetischer Einschluss
P 17.1: Poster
Thursday, February 28, 2013, 14:00–16:00, Poster EG
Modelling of helical current filaments induced by LHW on EAST — •Michael Rack1, Long Zeng1,2, Peter Denner1, Yunfeng Liang1, Xianzu Gong2, Kaifu Gan2, Eric Gauthier3, Liang Wang2, Fukun Liu2, Jinping Qian2, Biao Shen2, Jiangang Li2, and the EAST Team2 — 1Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Partner in the Trilateral Euregio Cluster, D-52425 Jülich, Germany — 2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China — 3Association EURATOM-CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
Helical radiation belts have been observed in the scrape-off layer (SOL) of the plasma during the application of lower hybrid wave (LHW) heating at the superconducting tokamak EAST. Modelled SOL field lines, starting in-front of the LHW antennas, show agreement in position and pitch angle to the experimental observed radiation belts. A splitting of the strike-line can be observed on the outer divertor plates during the application of LHW heating. Agreement in the comparison of the Mirnov coil signals and a modelled electric current flow along these SOL field lines was found. A lower hybrid current drive can induce such an electric current flow near the plasma edge. This electric current flow causes a change of the plasma topology which could result in the splitting of the strike-line as known from the application of resonant magnetic perturbation fields. Comparisons of modelled footprint structures and experimental observed heat load patterns in the divertor region are discussed.