Hannover 2010 – scientific programme

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P: Fachverband Plasmaphysik

P 20: Poster: Magnetic Confinement

P 20.1: Poster

Thursday, March 11, 2010, 16:00–18:00, Lichthof

A database for pellet ablation investigations in ASDEX Upgrade — •Gábor Cseh¹, Sándor Kálvin¹, Gábor Kocsis¹, Peter Lang², Tamás Szepesi¹, and ASDEX Upgrade Team² — ¹KFKI RMKI, EURATOM Association, P.O. Box 49, H-1525 Budapest-114, Hungary — ²MPI für Plasmaphysik, EURATOM Association, 85748 Garching bei München, Germany

Understanding the ablation process of cryogenic Deuterium (D) pellet in a plasma is of great importance. The pellet-plasma interaction already settles the effectiveness for application in plasma fuelling and edge control. Fast framing cameras short exposure (few μs) images of the radiating cloud formed around the ablating pellet were recorded, collected and analyzed for this investigation. For every image, the spatial distribution of the visible radiation was determined. Based on this two dimensional information a database was created. It stores parameters characterizing the cloud (e.g. typical shape, brightness distribution along pellet trajectory and magnetic field lines), pellet parameters (mass, speed, local ablation rate) and local plasma parameters (e.g. electron temperature and density). Our analysis aims to reveal if and how pellet cloud shape and radiation distribution depend on different parameters. The initial results of this project will be presented in this contribution.