Berlin 2005 – scientific programme

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P: Plasmaphysik

P 23: Poster: Magnetischer Einschluß 3, Staubige Plasmen 2, Astrophysikalische Plasmen 1

P 23.2: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster HU

A new tool for Alfven eigenmode analysis in Stellarators — •Stefan Zegenhagen, Andreas Werner, Arthur Weller, and Thomas Klinger — Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald

Mirnov diagnostic has proven to be a useful technique to detech Alfven eigenmodes in magnetically confined plasmas. The simple experimental setup and easy operation has made it a widely used tool in fusion research. But the interpretation of the data is usually quite complicated due to relatively high noise levels, non-evenly spaced probes, and the common coexistence of more than one mode. Here, a new analysis tool is presented that is based upon the well known Lomb periodogram. It allows to perform a time, frequency and mode number resolved analysis of Mirnov data while including the data of all probes, which may be unevenly spaced and sampled. First results for W7-AS data are presented.