Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Codes and Modeling/HEPP

P 18.4: Vortrag

Donnerstag, 3. April 2025, 12:20–12:35, ZHG102

Energy- and angle-dependent boundary condition for the electron kinetics of a plasma — •Clemens Hoyer¹, Felix Willert¹, Gordon K. Grubert², Detlef Loffhagen³, Markus M. Becker³, and Franz X. Bronold¹ — ¹Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany — ²Universitätsrechenzentrum, Universität Greifswald, 17489 Greifswald, Germany — ³Leibniz-Institut für Plasmaforschung und Technologie, 17489 Greifswald, Germany

For an electron Boltzmann equation we derive a Marshak type energy- and angle-dependent boundary condition, containing the electron microphysics inside the wall. It uses the electron surface scattering kernel [1], describing electron reflection as well as secondary emission from a microscopic solid-state physics point of view. We incorporate the kernel within an Legendre polynomial expansion approach for solving the electron Boltzmann equation [2], but the kernel can be also used for PIC-MCC simulations of the plasma’s electron kinetics. Numerical results for an argon plasma in contact with a silicon surface are presented, showing the significance of the microphysics-based boundary condition compared to an energy- and angle-independent phenomenological one. [1] F.X. Bronold and F. Willert, Phys. Rev. E 110, 035207 (2024). [2] M. M. Becker, G. K. Grubert, and D. Loffhagen, Eur. Phys. J. Appl. Phys. 51, 11001 (2010). F.X.B. and F.W. acknowledge support by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–495729137.

Keywords: plasma-wall interaction; Boltzmann equation; Legendre expansion; secondary electron emission