Chemical Erosion of CFC at High Ion Flux Densities

Abstract

Former measurements at PSI-1 have been completed by new investigations of the chemical erosion yield for a D+ flux density of 1.8 · D+/m2 · s in the upgraded plasma generator PSI-2. Si doped CFC samples (NS 31) were exposed to a deuterium plasma. By increasing the neutral gas pressure the electron temperature could be kept below 10 eV. Changing the heat contact between the sample and the cooling components of the water cooled target holder the surface temperature was varied between 300 and 900 °C. The measured erosion yield of about 0.5% at a target temperature of 500 °C confirms with the decreasing flux dependence.