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Influence of Magnetic Field on the Direction of Cathode Spot Plasma Jet Propagation

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4 Author(s)
Konstantin K. Zabello ; A. F. Ioffe Physical-Technical Institute, St.-Petersburg, Russia ; Stanislav U. Myatovich ; Alexander A. Logatchev ; Sergey M. Shkol'nik

This paper presents the method for the simultaneous determination of locations of vacuum arc attachments to the cathode and to the anode by high-speed photography. The method provides a possibility to ascertain the propagation direction of a cathode spot jet subjected to the action of a magnetic field. This method is used to examine single-spot vacuum arcs between Cu electrodes. The arc length is h=8~{\rm mm} , and the arc current is I=65~{\rm A} . The magnetic field have two independently varied components (axial component B_{z}\leq 0.2~ and tangential one B_{t}\leq 0.2~{\rm T} ). The accuracy of the jet angle determination is {\pm}{\rm 3}^{\circ} . The measurement data show that the jet, which is normal to the cathode in the immediate vicinity of its surface, is turned parallel to the magnetic field at some distance Z_{B} , which depends on magnetic field induction B and its inclination to the cathode surface. The experimental results are compared with calculation results found in the literature.

Published in:

IEEE Transactions on Plasma Science  (Volume:41 ,  Issue: 8 )