Abstract
When the shock front (SF) hits the central axis of plasma focus device, a reflected shock moves radially outwards. The magnetic piston (MP) continues to compress inwards until it hits the out-going reflected shock front. In the Lee model, to avoid of complexity and explanation of nonzero radius for the plasma pinched column, the pressure assumed uniform from the SF to the MP. In this paper shock wave propagation by MHD equations and pressure propagations between two electrodes had been investigated. The results showed that influence of shock wave propagation on the inward motion current sheath by Lorentz force had considerable effects on plasma pinch behavior and it may have an important responsibility for dense plasma column disruption before occurrence of m = 0 instability.
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