Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 8: Diagnostics I

P 8.3: Vortrag

Dienstag, 18. März 2014, 11:15–11:30, SPA HS201

Measurements of spectral line intensity by classical spectroscopic methods — •Marina Lisnyak¹, Dmitry Kalanov², Sergej Gorchakov¹, Yuriy Golubovskii², and Klaus-Dieter Weltmann¹ — ¹INP Greifswald e.V., Felix-Hausdorff-Str. 2, 17489 Greifswald — ²St. Petersburg State University, Ulyanovskaya 1, 198904 St. Petersburg, Russia

Optical emission spectroscopy (OES) is widely applied for plasma diagnostics. Evaluation of plasma parameters from the results accessed by the optical measurements has to be analysed taking into account the geometry of the plasma and the type of detector in order to avoid inaccuracy and mistakes by results interpretation. Especially, it should be taken into account that the plasma is a volumetric light source. The contribution discusses the applicability of particular OES methods for typical plasma sources and gives a methodological background that is important for plasma diagnostics. The analysis of the plasma domains from which the emitted light enters to the spectral device, taking into account the form of instrumental function, is presented. Correct optical arrangement for measurements with sufficient spatial resolution on a volumetric plasma source is suggested. Experimental results of the emission measurements using different detectors - iCCD, SMOS cameras and photomultiplier - are discussed focussing on advantages and disadvantages of each device. It is shown that the mistakes in optical arrangement can lead to critical mistakes and wrong interpretation of the results.