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Geant4 applications for modeling molecular transport in complex vacuum geometries

International Journal of Modeling, Simulation, and Scientific Computing 2014年第2期5卷 53-64页

作者： Jack Singal J.Brian Langton Rafe Schindler Department of Physics University of Richmond Gottwald Center for the Sciences 28 Westhampton DriveRichmondVA 23173 Kavli Institute for Particle Astrophysics and Cosmology SLAC National Accelerator Laboratory and Stanford University Menlo Park CA 94025

We discuss a novel use of the Geant4 simulation toolkit to model molecular transport in a vacuum environment,in the molecular flow *** Geant4 toolkit was originally developed by the high energy physics community to simulate the interactions of elemen-tary particles within complex detector *** its capabilities are utilized to model molecular vacuum transport in geometries where other techniques are *** techniques are verified with an application representing a simple vacuum geometry that has been studied previously both analytically and by basic Monte Carlo *** 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.

关键词： Gas flow dynamics Monte Carlo methods vacuum systems pumping sys-tems contamination sources

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Operating Characteristics of Cathodes Used for Microwave vacuum-Electronic Devices

Operating Characteristics of Cathodes Used for Microwave Vac...

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The 5th International vacuum Electron Sources Conference(IVESC2004)

作者： V.G.Vorozheikin V.I. Kozlov RPC "Electron systems" of FSUE RPE "ALMAZ" 1Panfilova str.Saratov410033Russia

＜正＞Ensuring the emissive reliability of microwave vacuum-electronic devices （MVED） is closely related to knowledge of the main operating characteristics of cathodes, primarily of cathode emissive ability and potential （resource） life. In research practice it is convenient to perform an estimate of cathode emissive ability via pre-heated curve [1] from which the knee temperature Tkn is found.

关键词： Cathodes Microwave devices Current density Knee Electrons vacuum systems Temperature dependence Production Nickel Additives

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