MODELING OF PLASMA INTERACTION WITH FIRST WALL IN FUSION REACTOR - MEASURING RESIDUAL MECHANICAL STRESSES IN TUNGSTEN AFTER IRRADIATION AT GOL-3 FACILITY

Residual stresses in rolled tungsten after pulsed irradiation with a plasma and an electron beam at the GOL-3 facility were measured. The mechanical stresses were derived from the strain, which was measured by the change in the interplanar distance in different directions. The interplanar distance was gaged from the shift of the peak of diffraction scattering of X-rays. The measured tension turned out to be a tensile stress along the surface. The tension along the direction of rolling and grinding was approximately three times larger than that in the perpendicular direction. The work was carried out at the VEPP-3/VEPP-4 complex.