摘要
We discuss a novel use of the Geant4 simulation toolkit to model molecular transport in a vacuum environment,in the molecular flow regime.The Geant4 toolkit was originally developed by the high energy physics community to simulate the interactions of elemen-tary particles within complex detector systems.Here its capabilities are utilized to model molecular vacuum transport in geometries where other techniques are impractical.The techniques are verified with an application representing a simple vacuum geometry that has been studied previously both analytically and by basic Monte Carlo simulation.We discuss the use of an application with a very complicated geometry,that of the Large Synoptic Survey Telescope camera cryostat,to determine probabilities of transport of contaminant molecules to optical surfaces where control of contamination is crucial.
基金
supported in part by the National Science Foundation through Governing Cooperative Agreement 0809409 managed by the Association of Universities for Research in Astronomy(AURA)
the Department of Energy under contract DE-AC02-76-SFO0515 with the SLAC National Accelerator Laboratory.
