Abstract
The paper describes investigation of characteristics of vacuum-arc cathode spots on refractory metal electrodes (Mo, W) that depend on magnetic field and the arc current and length: velocity of spot motion, average current per spot, and Robson angle. In the experiments, the arcs have lengths <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$h={2}$</tex></formula> and 6 mm and are subjected to magnetic field inclined to the cathode surface. The cathode surface is filmed during arcing by high-speed photography camera. The results obtained are compared with ones found in the literature.
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