Experimental Investigation of Combustion Modes and Contraction of Glow Discharge in CF4
Abstract
This paper studies in experiment the diffuse and contracted modes of dc glow discharge in CF4. The existence region for the contracted mode with pressure unchanged is found to be limited from the small inter-electrode gap side, this boundary being multi-valued. A contracted column establishes in a stratified positive column with current increasing and inter-electrode gap or gas pressure fixed. However with subsequent current increase the length of the positive column decreases (with simultaneous considerable expansion of the negative glow), and contraction vanishes. At longer inter-electrode gap the current increase does not lead to contraction vanishing.
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