Regensburg 2019 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 5: Vacuum Measurement in Technical Applications

VA 5.2: Vortrag

Montag, 1. April 2019, 16:05–16:35, H6

Improved model for transmission probabilities of edge-welded bellows based on TPMC simulations — •Marcel Krause and Joachim Wolf — Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany

Edge-welded bellows are a frequently used component of many complex vacuum systems. Simulating these bellows in the regime of molecular flow with a Test Particle Monte Carlo (TPMC) algorithm is often time-consuming and CPU-intensive. By investigating the change of the transmission probability of bellows in comparison to cylindrical tubes for a large range of geometry parameters of both the bellows and the tubes, we developped an empirical model for the transmission probability of edge-welded bellows. This new model allows to replace edge-welded bellows in TPMC simulations with cylindrical tubes with an effective length to account for the transmission probability of the bellow. We found that the replacement of a bellow with a cylindrical tube decreased the simulation time by factors up to 1000, while the error introduced through the replacement was in most cases negligible.