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Based on a magnetohydrodynamic (MHD) model, a two-dimensional transient MHD model of a vacuum arc was developed. In this model, the unsteady terms in mass, momentum, and energy conservation equations, Maxwellpsilas equations, and generalized Ohmpsilas law were considered. In energy conservation equations, work done by the electrical field, the force of friction and the thermal force were considered...
The motion of cathode spots in the initial expansion process of triggered vacuum arc under bell-shaped and saddle-shaped AMF was investigated with the aid of high-speed digital camera with exposure time of 2 microseconds. Experimental results indicated that cathode spots expanded faster under saddle-shaped AMF than under bell-shaped AMF. Furthermore, the motion of cathode spots slowed down between...
The influence of the distribution of axial magnetic filed (AMF) was investigated experimentally with three pairs of specially designed testing electrodes generating conventional bell-shaped AMF profile and different saddle-shaped AMF distributions. The characteristics of high-current vacuum arc (HCVA) up to 20 kA (rms), e.g., the shape of arc column, and the distribution of cathode spots, was investigated...
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