Electron distribution in a gridded Penning discharge
作者:
Dominick Conte,
Gordon Kent,
期刊:
Journal of Applied Physics
(AIP Available online 1974)
卷期:
Volume 45,
issue 6
页码: 2782-2784
ISSN:0021-8979
年代: 1974
DOI:10.1063/1.1663669
出版商: AIP
数据来源: AIP
摘要:
Electron distributions in a Penning discharge, consisting of two glow discharges separated by a cylindrical microwave cavity with gridded ends, were measured using the shift of resonant microwave frequencies and Langmuir probe data. The shape and magnitude of the distributions were determined for a range of pressure, discharge current, magnetic field, and for several cathode shapes. The microwave technique gives the distribution as a two‐parameter function, and the probe data gives a more detailed profile but quantitatively less reliable. All data indicated that the plasmas were electron rich. The distributions were azimuthally symmetric with a maximum at the center at higher pressures; at lower pressures and higher magnetic fields, the densities were depressed in the center, indicating the development of a circulating sheath of electrons. The data indicates that the microwave diagnostic technique is quite suitable when the distribution is a maximum at the center, and it is a useful procedure for calibrating a probe when there is no suitable probe theory for a particular range of experimental parameters.
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