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P: Fachverband Plasmaphysik

P 19: Poster: Hochtemperaturplasmen: Experiment und Diagnostik

P 19.4: Poster

Mittwoch, 30. März 2011, 16:30–18:30, Foyer

Characterisation of the ELM synchronized H-mode edge pedestal in ASDEX Upgrade and DIII-D — •Philip A. Schneider¹, Elisabeth Wolfrum¹, Rich Groebner², Tom H. Osborne², Mike G. Dunne³, John Ferron², Sibylle Günter¹, Bernd Kurzan¹, Philip B. Snyder², Hartmut Zohm¹, the ASDEX Upgrade Team¹, and the DIII-D Team² — ¹Max Plank Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany — ²General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA — ³Department of Physics, University College Cork, Association Euratom-DCU, Cork, Ireland

The results of a large database of edge pedestal data from type-I ELMy H-mode discharges from ASDEX Upgrade and DIII-D will be presented. The data from high resolution edge diagnostics of both devices is analysed with the same analysis code in order to avoid systematic differences. Furthermore, sophisticated equilibrium reconstructions are used to asses uncertainties which arise during mapping from 2D real space coordinates to 1D flux coordinates. ELM synchronization allows the study of the pedestal structure at the ELM stability boundary. The pedestal is characterized by its top value, the gradient and the width. A large paramater range is covered by the two devices. Over this parameter range the profile shape of edge electron density differs from that of the temperature, irrespective of the device. However, the resulting electron pressure profile shape remains similar for all analysed H-Mode discharges.