3-D Pressure Distribution in Molecular Gas Flow Vacuum System:A Simulation Study in Event-Triggering Test Particle Monte Carlo Method
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Graphical Abstract
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Abstract
The 3-D pressure distribution in molecular flow vacuum system was simulated in event-triggering Test Particle Monte Carlo (TPMC) method, based on rarefied gas dynamics.In the simulation, since only moleculewall collision is considered in molecular flow, the spatial pressure profile can be statistically derived in terms of the molecule-wall collision frequency involved.The discussions with specific example focused on the simulation algorithm, numerical discretization of outgassing rate and pumping speed, and statistical derivation of spatial pressure distribution.The molecular flow through a cylindrical tube was theoretically evaluated with Knudsen formula and numerically simulated with the lab-developed program based on event-triggering TPMC method, and the discrepancy was found to be less than 4%.In addition, the pressure profile in the photoelectron gun with complicated structure was tentatively investigated in a thought provoking way.
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