Carbon implantation into tungsten at elevated temperatures

The bombardment of W with 2.4 keV C at normal incidence in the temperature range between 293 and 973 K is investigated experimentally and by computer simulation. At room temperature the measured weight is at first increasing but then changing to a weight gain with the incident C fluence. This weight gain is reduced at temperatures above 750 K, and at 973 K a constant weight loss is observed. The computing approach was to couple the dynamic Monte Carlo program TRIDYN with the diffusion program PIDAT. Input data for C diffusion in W are taken from the literature. Agreement between experimental data and computed results can be achieved at temperatures around 800 K by using a smaller diffusion coefficient in the simulations than those found in the literature. (C) 1999 Elsevier Science B.V. All rights reserved.