Effect of Gas Mixture on Plasma Jet Discharge Morphology

• Published in: IEEE transactions on plasma science Vol. 39; no. 11; pp. 2304 - 2305
• Main Authors: Leiweke, R. J., Sands, B. L., Ganguly, B. N.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2011; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Admixtures; Annular; Argon; Atmospheric pressure; Atmospheric pressure plasma jet; Capillarity; Charge coupled devices; Chemical elements; discharge morphology; Discharges; Emission; Emissions; Glass; Helium; Imaging; Logic gates; Morphology; Plasma physics; Plasmas; spatiotemporally resolved imaging; Streaming media
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2011.2139228

The morphology of plasma emission from a streamerlike atmospheric pressure plasma jet initiated inside a glass capillary has been measured with a high spatial resolution for a gas flow of pure helium and He with a 5% Ar admixture using 5-ns time-gated intensified charge-coupled device imaging. In the pure helium plasma jet, emission remains annular and converges gradually along the core gas-air interface. With a 5% argon admixture, however, the plasma emission is initially annular inside the glass capillary but converges to the flow axis within 5 mm outside the capillary tip.