Sputtering experiments on B4C doped CFC under high particle flux with low energy

Sputtering property of newly developed 5-10% B4C doped CFCs with high thermal conductivity, similar to 160 W/m/K, was investigated under high particle flux with low energy by using the super low energy ion source (SLEIS) facility at Japan Atomic Energy Research Institute (JAERI). Hydrogen beam irradiation Lv:is performed with particle flux of 2-3 x 10(20)/m(2)/s and particle fluence of 3-9 x 10(24)/m(2) at 50 eV. Reduction of erosion of the matrix of CFCs by B4C doping was observed with a scanning electron microscope, while the carbon fibers were preferentially eroded. The sputtering yield of the B4C doped CFCs was 0.025-0.034.