|Author||Ohtsu, Y. ♦ Matsumoto, N. ♦ Schulze, J. ♦ Schuengel, E.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ DEPTH ♦ DIFFUSION ♦ ELECTRON DENSITY ♦ ELECTRON TEMPERATURE ♦ ELECTRONS ♦ HEATING ♦ HOLLOW CATHODES ♦ PEAKS ♦ PLASMA DENSITY ♦ RADIOWAVE RADIATION ♦ RINGS ♦ TEMPERATURE DISTRIBUTION ♦ WIDTH|
|Abstract||Spatial structures of the electron density and temperature in ring-shaped hollow cathode capacitive rf plasma with a single narrow trench of 2 mm width have been investigated at various trench depths of D = 5, 8, 10, 12, and 15 mm. It is found that the plasma density is increased in the presence of the trench and that the radial profile of the plasma density has a peak around the narrow hollow trench near the cathode. The density becomes uniform further away from the cathode at all trench depths, whereas the electron temperature distribution remains almost uniform. The measured radial profiles of the plasma density are in good agreement with a theoretical diffusion model for all the trench depths, which explains the local density increase by a local enhancement of the electron heating. Under the conditions investigated, the trench of 10 mm depth is found to result in the highest plasma density at various axial and radial positions. The results show that the radial uniformity of the plasma density at various axial positions can be improved by using structured electrodes of distinct depths rather than planar electrodes.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Physics of Plasmas|
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