NDLI: An experimental study of the dynamics of formation of plasma in a vacuum-arc discharge

Content Provider	Springer Nature Link
Author	Prozorov, E. F. Fedorov, V. A. Ul’yav, K. N.
Copyright Year	2009
Abstract	An experimental study is made of the dynamics of formation of plasma in a vacuum-arc discharge (VAD) at different currents and different transverse dimensions of CuCr50 electrodes. High-speed multipleframe photography is used to obtain the time dependence of the current channel diameter and determine the rate of plasma expansion. It is demonstrated that the rate of expansion under the experimental conditions is independent of the discharge current, as well as of the presence or absence of external axial magnetic field. Two modes are identified, which differ from one another by the rate of expansion. Experiments are performed with anodes and cathodes of different diameters in the range of currents from 2 to 15 kA. It is demonstrated that, with electrodes of different sizes, a discharge initiated at the cathode center expands with time to the size of the smaller electrode while retaining the cylindrical shape. The anode temperature is calculated for two modes in view of the variation of the source power and of the transverse dimension of the zone of heating. It is demonstrated that the anode spot in the mode of rapid expansion is formed under insignificant heating of the anode. In the case of slow expansion, a strong heating of the anode is possible, under which its intense evaporation occurs. The anode temperature is calculated in view of the evaporation losses for modes with different numbers of jumpers arising as a result of the breaking of vacuum switch contacts.
Ending Page	164
Page Count	7
Starting Page	158
File Format	PDF
ISSN	0018151X
e-ISSN	16083156
Journal	High Temperature
Issue Number	2
Volume Number	47
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-04-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atoms and Molecules in Strong Fields, Plasma Physics Mechanics, Fluids, Thermodynamics Materials Science Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Condensed Matter Physics

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