Abstract
A Mather-type small plasma focus device was operated in air filling in the pressure range of 0.5 to 1.0 Torr and capacitor bank charging voltage of 13–15 kV. A strong focusing action was observed in this pressure range. Magnetic probe signals at various axial positions were used to estimate velocity of current sheet and axial magnetic field distribution profiles. It was observed that under the present experimental conditions the magnetic field remains constant at 0.72 T from z=0.0 cm to z=8.0 cm but falls rapidly to 0.52 T at about z=14.5 cm at a fixed radial distance of 2.65 cm. The magnetic field and velocity measurements indicate a current shedding effect—only 68.5% of the total injected current flows into the focus region. The rapid drop of the magnetic field at z=8.0 cm suggests that further (initial shedding is at the insulator) current and mass shedding in the focus tube is significant after this value of z. Experimental values of velocity of the current sheet are compared with those of the snow plough theoretical model.
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