Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Diagnostics I

P 9.7: Vortrag

Dienstag, 3. März 2015, 12:35–12:50, HZO 30

Imaging of plasmas by optical lens-systems — Sarah Siepa¹ and •Uwe Czarnetzki² — ¹Institute for Experimental Physics II, Ruhr-University Bochum, 44801 Germany — ²Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44801 Germany

Optical emission spectroscopy of plasmas is a cheap and easy experimental method to determine plasma parameters. One of its major drawbacks, though, is that it can only yield line-integrated information. Lenses are often used in order to enhance the spatial resolution of the method by sharply imaging the point of interest within the plasma. However, there still is a contribution also from other plasma volume elements. In this work the amount of light collected from different positions within the plasma is quantified for a typical lens-detector-system. A function is derived describing the detected fraction of light emitted from plasma volume elements on the axis of the optical system as well as from relevant positions off the axis. The relative contribution of each plane along the axis to the overall detected intensity is given. The possibility of using this detection function in order to gain spatial resolution is discussed.