Berlin 2024 – scientific programme

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuum Science and Technology (Poster Session)

VA 3.2: Poster

Tuesday, March 19, 2024, 12:30–14:30, Poster A

Investigations of the particle flux distribution outside thermal effusion cells using Monte Carlo simulations — •Tristan Stiller — CreaTec, Erligheim, Deutschland

Thermal effusion cells have different applications depending on the experimenter's objective. In molecular beam epitaxy applications, for example, a distribution that is as homogeneous as possible over a certain area at a certain distance is desired, i.e. a uniform incidence rate on the substrate. The aim is to achieve uniform layer growth in finite times with comparatively high fluxes. If, on the other hand, one is interested in the properties of individual atoms, the aim is to extract as few particles as possible from an effusion cell, collimated as well as possible, in order to then investigate them further in the further course of the experiment using magneto-optical traps, for example. With these aspects in mind, various effusion cell geometries and collimator designs were investigated using direct Monte Carlo simulations (DMCS). This was realized with MolFlow, a freely available code from CERN.