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The Transmission of a Sampling Orifice for Charged and Excited Particles in the Molecular Flow Range
Author(s) -
Helm H.
Publication year - 1978
Publication title -
beiträge aus der plasmaphysik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0005-8025
DOI - 10.1002/ctpp.19780180303
Subject(s) - body orifice , metastability , orifice plate , range (aeronautics) , flow (mathematics) , mechanics , materials science , reflection (computer programming) , charged particle , physics , chemistry , atomic physics , engineering , ion , composite material , mechanical engineering , quantum mechanics , computer science , programming language
The transmission of a circular orifice in the molecular flow range is calculated for the case that the particular state of particles flowing through the orifice is affected by wall collisions. The deactivation of metastable atoms and the neutralisation of charged particles at the orifice tube wall is taken into account. The results give a detailed illustration of the fate of particles passing an extraction orifice, namely the fraction of particles passing without wall collision, the fraction passing after one and after multiple wall reflections as a function of the characteristic dimensions of the orifice and the reflection coefficient.