Temperature dependence of sputtering yield of carbon fiber-reinforced carbon composites with low energy and high flux deuterium ions

A super low energy ion source (SLEIS) was used to simulate the sputtering conditions at the divertor in next fusion experimental reactors such as ITER. One directional:1D-, two directional:2D-, three directional:3D-CFCs, isotropic graphite, and B4C doped 1D-CFC were sputtered by SLEIS with high fluxes (1-2 x 1020/m2/s) of 200 eV D3+ ions. Test samples were sputtered at temperatures of 200-800 C, where chemical sputtering dominates, with an incident angle of 30 and also at 500 C with incident angles of 0-60 . Sputtering yields were calculated from the weight loss of irradiated samples and the fluences. The sputtering yields of 1D-, 2D- and 3D-CFCs showed nearly the same temperature dependence as an isotropic graphite, though the yield of B4C doped-1D CFCs was smaller than those of these CFCs. The angular dependence of the chemical sputtering yield is determined by the cosine value of the incident angle in each CFC, where the yield of B4C doped-1D CFC is lower than those of MFC-1 (1D) and CX-2002U (2D). (orig.)