Abstract:
An investigation was made of the charge, kinetic, and geometric parameters of the ion component of a laser plasma in the final stages of expansion when the radiation was focused into a conical recess in a lead target. The dependences of these parameters on the cone vertex angle were determined and a comparison was made with plane targets. The measurements were made by probe and mass spectrometer techniques. The results suggest that a narrow highly directional plasma jet with a high degree of ionization can be produced by optimizing the target shape and the radiation focusing conditions. A possible mechanism of the influence of collision processes on the resultant plasma parameters is discussed.
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