Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School II
P 11.3: Talk
Tuesday, March 14, 2017, 14:50–15:15, HS 1010
Radio frequency heating induced edge plasma convection — •Wei Zhang1,2, Wouter Tierens1, Diogo Aguiam3, Vladimir Bobkov1, David Coster1, Helmut Fuenfgelder1, Jonathan Jacquot1, Jean-Marie Noterdaeme1, Roman Ochoukov1, Antonio Silva3, the ASDEX Upgrade Team1, and the EUROfusion MST1 Team1 — 1Max Planck Institute for Plasma physics, Garching, Germany — 2University of Ghent, Ghent, Belgium — 3University of Lisbon, Lisbon, Portugal
Plasma heating with radio waves in the Ion Cyclotron Range of Frequency (ICRF) is one of the standard heating methods in tokamaks. The parallel electric field of the ICRF waves enhances the edge plasma potential nonlinearly through radio frequency sheath rectifications. Subsequently this large inhomogenous potential drives E× B convection in the plasma edge. In this contribution, the plasma density convection induced by 2-strap and 3-strap antennas with different antenna feeding configurations are investigated in the ASDEX Upgrade tokamak. Experimentally, the E× B convection is measured with the poloidal distributed reflectometers embedded in the 3-strap antenna. Theoretically, this E× B convection is simulated by running the EMC3-EIRENE, RAPLICASOL and SSWICH codes in an iterative and self-consistent way. Qualitative agreements are found between the simulations and experiments. It is indicated that the sheath rectifications and density convection induced by 3-strap antennas with optimized feeding configuration are smallest, and those induced by 2-strap antennas are usually largest.