The vacuum arc cathode spot can be applied to pretreatment of thermal spray because the surface of cathode is evaporated by the vacuum arc cathode spot However, the behavior of cathode spot is random manner caused by the current density. Thus, it is necessary to calculate the electron and ion current. In this paper, simulation of vacuum arc cathode spot movement affected by electron and ion current density distribution is elucidated. As a result, the electromagnetic force caused by ion and electron current was calculated. The moving speed of the cathode spot increases with increasing the magnetic flux density. Therefore, it can be expected to improve the surface treatment technology with vacuum arc cathode spot.
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