Testing Secondary-Emission Self-Oscillatory Probe
https://doi.org/10.1134/S207956292004017X
Abstract
The test results of the prototype of the secondary-emission probe operating in the mode of self-oscillatory sweep intended for diagnosing nonequilibrium plasma in the presence of epithermal group of electrons are given. Earlier, the method of self-oscillatory probe was tested using an aluminum water-cooled contact surface with formation of a nanoscale thick high-emission oxide coating. The structure of the described probe is peculiar owing to application of refractory tantalum, which is capable of working in the mode of radiation cooling, which simplifies the structure and increases the reliability of the probe. It is shown that, owing to secondary-emission characteristics, oxide-coated tantalum allows under plasma loading obtaining a pronounced N-type current–voltage characteristic with a large excess in the electron-emission current component against the ion saturation current and satisfies all requirements for realization of the method of self-oscillatory probe.
Keywords
nonequilibrium plasma,
probe characteristic,
self-oscillatory development,
plasma discharge,
secondary emission
Supporting agencies: The work was carried out with financial support RSF grant No. 17-12-01575
About the Authors
I. V. Vizgalov
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
115409; Moscow
I. А. Sorokin
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute); Fryazino Branch, Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences
Russian Federation
Russian Federation
115409; Moscow; 141120; Moscow oblast; Fryazino
References
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Review
For citations:
Vizgalov I.V., Sorokin I.А. Testing Secondary-Emission Self-Oscillatory Probe. Nuclear Physics and Engineering. 2020;11(4):225-233. (In Russ.) https://doi.org/10.1134/S207956292004017X
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