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Accession Number DE2013-1063799
Title Geant4 Applications for Modeling Molecular Transport in Complex Vacuum Geometries.
Publication Date Feb 2013
Media Count 5p
Personal Author J. Singal J. B. Langton R. Schindler
Abstract This letter discusses 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 elementary 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 veried 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.
Keywords Contamination
Elementary particles
Gas flow
Geant4 toolkit
High energy physics
Molecular structure
Monte Carlo method
Pumping systems
Vacuum states

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 46 - Physics
54C - Astrophysics
Corporate Author Stanford Linear Accelerator Center, CA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1319
Contract Number DE-AC02-76SF00515

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