Über die Rolle der Trägheitskräfte beim linearen z-Pinch

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Abstract
In a fast linear z-pinch (f=600 kc/s, W=800 joules) the LORENTZ-force is essentially effective on the plasma near the chamber wall. Only during the later phase of the implosion it prevents the formation of the rarefaction wave, which propagates radially outward from the outer surface of the pressure wave following the shock front. The vanishing of the LORENTZ-force does not influence further propagation of the cylindrical shock wave if the discharge is crowbarred in the first currentzero before the shock front hits the axis or if the current is damped to a small amount compared with its initial value. No KRUSKAL-SCHWARZSCHILD instabilities have been observed. Under these conditions the z-pinch may be followed by a θ-pinch before the plasma of the first reaches the chamber walls. There is no screw-shaped superposition of the magnetic fields in this case. Theoretical calculations of the plasma flow are in good qualitative agreement with the experiments. For a 60 kJ discharge plasma pressure and temperature are calculated at the time of maximum contraction by numerical integration of the equation of motion.

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