ON THE STABILITY OF A VACUUM ARC WITH A DIFFUSE HOT CATHODE ATTACHMENT
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Published:2023
Issue:3
Volume:27
Page:43-49
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ISSN:1093-3611
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Container-title:High Temperature Material Processes An International Quarterly of High-Technology Plasma Processes
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language:en
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Short-container-title:High Temp Mat Proc
Author:
Polishchuk V. P.,Usmanov Ravil A.,Melnikov A. D.,Yartsev I. M.
Abstract
In various applications, intense plasma flows, which do not contain microparticles, are required. In previous works, similar fluxes have been obtained in vacuum arcs with diffuse attachment of hot metal cathodes, comprised of chromium, gadolinium, lead, or titanium. This paper presents experimental studies of an arc on a cerium dioxide (CeO<sub>2</sub>) cathode at currents of 40-90 A and cathode temperatures of 2.1-2.45 kK. Due to the transfer nature of its arc current, CeO<sub>2</sub> is considered to be a semiconductor. In this study, the results showed that the cathode current attachment can exist in diffuse and spot modes. Cathode spots of 0.1-0.3 mm in size appeared on the vacuum arc surface with a decrease in the cathode temperature. The maximum speed of motion of the cathode spots reached ~ 5 cm/s. The occurrence of cathode spots did not affect the discharge voltage, which varied from 10 to 12 V; in addition, there were no chaotic voltage pulsations.
Subject
Physical and Theoretical Chemistry,Spectroscopy,General Engineering,Energy Engineering and Power Technology,Condensed Matter Physics,General Materials Science
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