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(CDP/11) Comparing High Power Ion Cyclotron Resonance Frequency Heating with Neutral Injection in ASDEX Upgrade: Differences, Similarities and Synergies

J.-M. Noterdaeme, D. A. Hartmann, A. Stäbler, M. Brambilla, B. Bruesehaber, J. C. Fuchs, J. Gafert, A. Gude, B. Kurzan, M. Maraschek, R. Neu, F. Ryter, F. Serra^*, J. Stober, W. Suttrop, S. Vergamota^*, H.-P. Zehrfeld and ASDEX Upgrade Team

Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany
^* Centro de Fusao Nuclear, Instituto Superior Técnico, EURATOM Association, P-1096 Lisboa Codex, Portugal

Abstract.  By using 3 dB couplers, ICRF heating has become much less sensitive to changes in coupling. High power regimes with strong ELMs could thus be investigated. Comparison with NI then allows effects specific to the heating schemes to be investigated. Large differences were observed on the central plasma, in particular on the sawteeth. With ICRF heating, the central electron temperature is higher and the sawtooth amplitude larger than with NI. No difference was seen on the ELM behaviour (frequency, effect on edge T_e) between NI and ICRF. The combination of NI and ICRF results in stabilization of the 3,2 neoclassical mode, under conditions where it is unstable with NI alone.

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