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P: Plasmaphysik
P 4: Diagnostik 1; Niedertemperaturplasmen / Plasmatechnologie 2; Magnetischer Einschluß 2
P 4.36: Poster
Monday, March 27, 2006, 17:00–19:00, Flure
Study of ELM induced edge transport barrier collapse applying reflectometry at ASDEX Upgrade — •L. Fattorini1, S. Da Graca1, P.T. Lang2, M.E. Manso1, M. Maraschek2, and ASDEX Upgrade Team2 — 1Centro de Fusão Nuclear, Associação EURATOM / IST, Instituto Superior Técnico, Av. Rovisco Pais, P-1049-001 Lisboa, Portugal — 2Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching, Germany
Onset conditions and dynamics of the Edge Localized Mode (ELM) are still subject to intense investigations due to their relevance in establishing a reliable and robust operational baseline scenario for the fusion reactor ITER. The most significant fingerprint of the ELM instability is the repetitive transient collapse of the H-mode edge transport barrier resulting in strong burst like particle and energy loss from the plasma. Reflectometry with its high temporal and spatial resolution is a diagnostic especially suited to study radial displacements of density layers and the level of density fluctuations. Applying the ASDEX Upgrade FM-CW reflectometer probing simultaneously the plasma low (LFS) and the high field side (HFS) yields resolution of the ELM dynamics and allows for a better understanding of its underlying physics. Besides the dynamics of intrinsic ELMs also ELMs forced by the injection of cryogenic deuterium pellets were investigated. Reflectometry and MHD observation are combined for both kind of ELMs to investigate the correlation between imposed perturbation and ELM release.