Vl.V. Bobkov et al 2006 Nucl. Fusion 46 S469 doi:10.1088/0029-5515/46/7/S09
Vl.V. Bobkov1, R. Bilato1, F. Braun1, R. Dux1, J.-M. Noterdaeme1,2, the ICRF team and the ASDEX Upgrade team
Show affiliationsThe relative impact of edge localized modes (ELM) size and plasma shape on the antenna coupling in ASDEX Upgrade discharges is studied. A strong dependence of relative change in the ion cyclotron range of frequencies antenna coupling during ELMs on the ELM size is observed. The changes in the coupling also show some dependence on the plasma triangularity; the latter generally influences the ELM size. At high plasma density and small antenna–plasma distance, however, there is a strong residual correlation of the antenna coupling on the plasma triangularity which appears not to be connected with the ELM size. A possible explanation of this correlation is given in terms of the connection lengths of the magnetic field lines at the antenna. This hypothesis is substantiated by the investigation of L-mode discharges, which are better diagnosed than the ELM phases of the H-mode ones.
52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons
52.55.Fa Tokamaks, spherical tokamaks
52.40.Hf Plasma-material interactions; boundary layer effects
Issue 7 (July 2006)
Received 5 October 2005, accepted for publication 30 May 2006
Published 21 June 2006
Vl.V. Bobkov et al 2006 Nucl. Fusion 46 S469
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