Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Magnetic Confinment Fusion/HEPP V

P 20.2: Vortrag

Donnerstag, 3. April 2025, 14:15–14:40, ZHG102

About recent progress in collisional-radiative modelling of molecular hydrogen plasmas — •Richard Christian Bergmayr, Dirk Wünderlich, and Ursel Fantz — Max Planck Institute for Plasma Physics, Garching, Germany

Collisional-radiative (CR) models for molecular hydrogen are crucial for the quantitative analysis of molecular emission from low temperature plasmas (e.g. fusion divertor plasmas) and are suited to predict effective rate coefficients for neutral kinetic codes (e.g. EIRENE) in order to understand the extent to which molecules contribute to the detachment process. The accuracy of CR model predictions is limited by the availability of accurate reaction probabilities as model input. The latest advances in molecular input data motivate the development of a fully ro-vibrationally resolved CR model for molecular hydrogen. A multi-stage approach is pursued, in which population models with different detail level of (ro-vibrational) resolution are composed based on the Yacora solver. These models utilize specifically for their purpose composited databases of recent reaction probabilities, are successfully benchmarked on various experiments (e.g. divertor plasmas, linear devices and small scale laboratory experiments) and are employed for different, dedicated fields of applications. This includes the first time quantification of the influence of spin-mixing processes, post-processing EDGE2D-EIRENE JET L-mode profiles in comparison to predictions by the AMJUEL database (which is used as a standard in EIRENE) and unprecedentedly accurate, ro-vibrationally resolved Fulcher-α band emission predictions.

Keywords: collisional-radiative modelling; molecular hydrogen; plasma spectroscopy; divertor physics