Düsseldorf 2007 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster

P 16.22: Poster

Wednesday, March 21, 2007, 16:30–18:30, Poster A

Effect of Uncertainties in a Collisional-Radiative Model of a Gas Discharge — •Dirk Dodt and Andreas Dinklage — Max Planck Instut für Plasmaphysik, Teilinstitut Greifswald

The plasma of a noble gas discharge is described using a collisional-radiative model. The dominant elementary processes in the parameter range considered are electron impact excitation, radiative decay, and recombination at the walls for ions and metastable excited states. The model aims at the reconstruction of the energy distribution of the electrons (EEDF) from the measured line emission of the plasma.

The uncertainties of the underlying atomic data are quantified and their effect on the modelled state densities and reconstruction parameters is investigated. The resulting systematic uncertainties in the forward model are studied in a Bayesian framework.

Further aspect of the forward modelling of the signal are discussed; a detailed description of the optics and the spectrometer allows the interpretation of the absolutely calibrated intensities.