Radial contraction of microwave-sustained plasma columns at atmospheric pressure
| Autor: | Y. Kabouzi, K. C. Tran, C. Trassy, Michel Moisan, María Dolores Calzada |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 91:1008-1019 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1425078 |
| Popis: | Plasma columns sustained at high enough gas pressures undergo radial contraction as manifested by their glow not entirely filling the radial cross-section of the discharge tube. This phenomenon has been reported with direct current, radio frequency, and microwave discharges. However, its modeling is still incomplete, in particular for rf and microwave discharges, a situation attributed to a lack of experimental data. To fill this gap, we took advantage of the extreme flexibility in terms of field frequency, tube diameter and gas nature of surface-wave sustained discharges to achieve a parametric study of this phenomenon. Special attention was paid to filamentation, specific to rf and microwave discharges, which is the breaking of a single channel of plasma into two or more smaller filaments as a result of the skin effect. We used emission spectroscopy as the main diagnostic means. Electron density was obtained from Stark broadening of the Hβ line, while molecular-band spectra emitted by the OH radical and... |
| Databáze: | OpenAIRE |
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