Influence of the source's form in the model of phase moves in metals exposed to pulsed ion beams

A numerical study has been performed of the influence of the source's characteristics (intensity, duration, multiplicity of action, etc.) on the form of the interphase ξ(t) that separates the melted and firm parts in a sample irradiated by a high current pulsed ion beam. An algorithm of a numerical solving of the corresponding Stephan's problem of the first kind is described. An analysis of the accuracy of the computational scheme has been done, and the obtained numerical results describing some characteristics of the interphase ξ(t) are presented (melting depth, melting rate, beginning of hardening, etc.). It has been found that at the interphase ξ(t) the temperature derivative with respect to time has a gap