Abstract
The possibility of supersonic motion of cathode plasma in a low-current vacuum arc in an axial magnetic field has been studied. It is shown that an increase in the electron temperature unavoidably leads to a plasma flow crisis, whereby the plasma velocity decreases to the sound velocity. The dependence of the limiting length of a stationary flow on the magnetic field has been studied. The maximum possible electron temperature Tcr in the plasma is determined by the initial ion energy and can be estimated as Tcr ≈ 3Tm, where Tm is the maximum electron temperature in the cathode spot region.
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