Bochum 2015 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.6: Poster

Tuesday, March 3, 2015, 16:30–18:30, Foyer Audimax

Doppler coherence imaging of ion dynamics in the plasma experiment VINETA — •Dorothea Gradic, Oliver Ford, and Robert Wolf — Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, D-17491 Greifswald, Germany

Ion flows are investigated with the Doppler coherence imaging system (CIS) in the linear plasma experiment VINETA. The Doppler CIS is a passive optical diagnostic for the observation of plasma bulk ion dynamics. It enables line-integrated measurements to obtain 2D images of the ion flow and ion temperature. With a few birefringent plates, a narrow UV-VIS bandpass filter and a CCD camera a plasma image is acquired, modulated with an interference pattern induced by the plates. The fringe phase and contrast of the interference pattern encode the spectral information of the light. The spectral position and width are dependent on the Doppler shift and broadening induced by the movement of the light-emitting plasma particles.

The major objective of this study is the research of ion dynamics during a driven magnetic reconnection event in VINETA. Magnetic reconnection is of importance in space phenomenas, such as solar flares or in the Earth's magnetosphere, as well as in fusion experiments. It will be investigated whether magnetic reconnection has an influence on VINETA ion dynamics.

First studies have been made to analyse the dependence of the measured phase difference on spectral wavelength changes. Additionally, ion dynamics in VINETA without reconnection were investigated.