Boundary Values of Some Glow Plasmas

Details Boundary Values of Some Glow Plasmas Boundary Values of Some Glow Plasmas

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703..104l&link_type=abstract

PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 104

Physics

Plasma Heating By Dc Fields, Ohmic Heating, Arcs, Glow, Corona

Scientific paper

Paschen curves are widely used to show the relationship between breakdown voltage and the (pressure × gap) product in DC discharge plasmas. A recent paper proposes the use of pressure instead of product since the former gives explicit information about the mean free path. We have applied this criterion to determine the boundary values of three glow plasmas, i.e., the voltage corresponding both to the start and extinction of the glow stage, at a constant pressure. The procedure was tried on helium, argon, and air, there resulting two curves for each of the gases. We have called them the ignition and the extinction curves. We have not found any glow outside the shown pressure limits. So, the plotted pressure and voltage values represent the domain of existence for each of the three glow plasmas. The diagnosis performed lead to glow plasma parameters (such as the Debye length) that match well to those in the literature. A probable relationship between the minimum pressure for glow and the breakdown product is mentioned.

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