Title :
Comparison of a He and an Ar Cold RF Atmospheric-Pressure Plasma Jet Operating in Continuous and Pulsed RF Modes
Author :
Hofmann, Sven ; Bruggeman, Peter
Author_Institution :
Dept. of Appl. Phys., Eindhoven Univ. of Technol., Eindhoven, Netherlands
Abstract :
In this paper, the absorbed power, power density, and absolute UV emission of a radio-frequency jet working in continuous and pulsed modes are measured. The plasma source is a plasma needle which operates under atmospheric pressure with helium or argon in air. Photographs of the discharges were taken to present the effect of radial contraction of the argon plasma for the highest power densities investigated. The contraction is explained by the electron-ion-dissociative-recombination-dominated losses in the argon case.
Keywords :
argon; helium; high-frequency discharges; plasma density; plasma diagnostics; plasma instability; plasma jets; Ar; He; absolute UV emission; absorbed power; argon plasma; atmospheric-pressure plasma jet; continuous RF modes; discharges; electron-ion-dissociative-recombination-dominated losses; photographs; plasma needle; plasma source; power densities; power density; pulsed RF modes; radial contraction; radio-frequency jet working; Argon; Helium; Needles; Plasma measurements; Plasma temperature; Radio frequency; Atmospheric-pressure plasma (APP) jet; radial contraction;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2160810
