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A feature of dynamical pinches is their tendency to generate nonthermal (fast) particles. The development of ion runaway and manifestations of a recently proposed ion gyro-reflection-acceleration in computer simulations and Schlierenpictures taken at plasma focus experiments are studied. Consequences concerning pinch equilibrium and stability are outlined.

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Part of the dye laser tune-up and preliminary Schlieren investigation was performed by M. Milanese and J. Pouzo (scholar of Alexander von Humboldt-Foundation).