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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.21: Poster
Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG
Hydrodynamic Effects in Cryogenic Buffer Gas Cells — •Nick Vogeley1, Bernd Bauerhenne2, and Daqing Wang1 — 1Institut für angewandte Physik, Uni Bonn — 2Experimentalphysik I, Uni Kassel
We report a screening of design geometries for cryogenic buffer gas beam cells operating in the hydrodynamic extraction regime with moderate throughput J ≈ 50 sccm. We performed steady-state slip-flow simulations for helium at T= 4.5 K and included a localized heat source to represent the ablation or injection point of the species of interest. In a subsequent direct-simulation Monte Carlo diffusion model we tracked the trajectories of these particles to compare the performance for different buffer gas injection geometries. While most prior studies focused on box-like or cylindrical cells, we investigated hydrodynamic effects such as vortex formation within a spherical cell and assessed whether these could be utilized to improve extraction efficiency. In addition to the observed enhancement in extraction yield and reduced deposition on inner walls, we identified indicators for experimental verification of these effects in time-of-flight measurements.
Keywords: cold molecules; hydrodynamics; diffusion