Garkusha I. Mechanisms of erosion and modification for surface layers of solids under irradiation with powerful plasma streams

The object is physical processes in surface layers of solids under irradiation with powerful plasma streams. Aim: determination of the dominant mechanisms of radiation damage and surface modification under the impact of plasma particle and energy loads. Methods: SEM, EDX, conversion Messbauer spectroscopy, XRD, laser mass-analyzer, RBS, tribology and corrosion tests etc. Dominating mechanisms of radioactive erosion of divertor materials (tungsten, graphite etc.) and their relative contribution in extreme conditions of fusion reactor are determined. Threshold changes of tungsten morphology and mass losses under the repetitive irradiation are found. Physical basis of surface modification of solids under irradiation with pulsed plasma streams is developed. Heterophase transformations in surface layers of steels and alloys under the influence of pulsed plasma streams as well as features of alloying from gas and metallic plasma and by mixing in liquid phase are investigated. Field of application: solid state physics, radioactive physics.