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Ionenschallinstabilitäten in Edelgas‐Gleichstromentladungen bei niedrigen Drücken. I. Meßanordnung und experimentelle Ergebnisse
Author(s) -
König A.,
Leven R.
Publication year - 1980
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.19800200207
Subject(s) - neon , radius , gas filled tube , atomic physics , torr , argon , helium , tube (container) , wavelength , excited state , materials science , chemistry , physics , optics , thermodynamics , computer security , computer science , composite material
An experimental study of self‐excited ion acoustic waves with wavelengths greater than the radius of the discharge tube in a de‐low pressure column is presented. The propagation of this type of waves was observed over a pressure range of 5 · 10 −4 torr ≦ p ≦ 10 −1 torr and currents of 0,02 A ≦ i ≦ 0,6 A in various gases (argon, neon, helium, and hydrogen) in cylindrical glass tubes with diameters of d = 2;4 and 6 cm. The Dispersion behaviour and the existence range were measured in dependence of the internal parameters of the discharge (characteristic velocities and collision frequencies) and the geometry of the discharge tube. It is shown, that the existence range depends not only on gas pressure and current but is influenced also by the geometry of the discharge tube. The minimum wavelengths which belong to the upper cut‐off frequencies correlate with the radius of the discharge tube at currents higher than i ∼ 0,2 A and increasing pressure.