Effect of Irradiation with Pulsed Fluxes of High-Temperature Deuterium Plasma and Fast Ions on the Structure of the Surface Layer of W-1% La_2O_3 Alloy

摘要

Scanning electron microscopy, X-ray electron probe analysis, and X-ray phase analysis are used to investigate the surface structure of W-1% La_2O_3 alloy after irradiation with submicrosecond pulses of deuterium ions and high-temperature deuterium plasma in a Plasma Focus installation for simulation of a plasma disruption in the ITER tokamak. It is established that melting of the tungsten surface and formation of micro-cracks take place under irradiation with a power flux density up to 10~(12) W/cm~2. Introduction of La_2O_3 particles in the alloy leads to the formation of complex La-W-O oxides with lower melting points, which results in the formation of a nonuniform structure affecting the high-temperature response of the material.