A contribution to spectroscopic diagnostics and cathode sheath modeling of micro-hollow gas discharge in argon

Journal Article · Mon Aug 01 04:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3615962· OSTI ID:22036673

Cvejic, M; Spasojevic, Dj; Sisovic, N M; Konjevic, N ^[1]

---

1. Faculty of Physics, University of Belgrade, P.O. Box 368, Belgrade 11001 (Serbia)

In this paper, the hydrogen Balmer beta line shape from a micro-hollow gas discharge (MHGD) in argon with traces of hydrogen is used for simultaneous diagnostics of plasma and cathode sheath (CS) parameters. For this purpose, a simple model of relevant processes responsible for the line broadening is introduced and applied to the Balmer beta profile recorded from a MHGD generated in the microhole (diameter 100 {mu}m at narrow side and 130 {mu}m at wider side) of a gold-alumina-gold sandwich in the pressure range (100-900 mbar). The electron number density N{sub e} in the range (0.4-4.5) x 10{sup 20} m{sup -3} is determined from the width of the central part of the Balmer beta line profile, while, from the extended wings of the Balmer beta profile, induced by dc Stark effect, the next three parameters are determined: the average value E{sub a} of electric field strength in the CS in the range (16-95 kV/cm), the electric field strength E{sub 0} at the cathode surface in the range (32-190 kV/cm), and the CS thickness z{sub g} in the range (18-70 {mu}m). All four MHGD parameters, N{sub e}, E{sub a}, E{sub 0}, and z{sub g}, compare reasonably well with results of the modeling experiment by M. J. Kushner [J. Phys. D: Appl. Phys. 38, 1633 (2005)]. The results for N{sub e} are compared with other emission experiments.

• OSTI ID: 22036673
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 110; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM OXIDES
ARGON
CATHODES
COMPARATIVE EVALUATIONS
ELECTRIC FIELDS
ELECTRON DENSITY
ELECTRONS
EMISSION SPECTROSCOPY
GLOW DISCHARGES
GOLD
HYDROGEN
LINE BROADENING
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA SHEATH
PLASMA SIMULATION
STARK EFFECT
SURFACES