Monte Carlo analysis of plasma-surface interactions in a fusion ignition experiment

Summary form only given. A Monte Carlo routine has been developed for simulation of the velocity distribution of plasma ions incident on a surface with a floating potential. This routine was incorporated into the code TRIM.SP, which was then used to calculate sputtering, backscattering, and implantation values for a deuterium plasma in contact with a carbon surface. The plasma configuration considered consists of a Maxwellian plasma bounding a collisionless plasma presheath and sheath. To simulate each incident plasma ion, the code generates the velocity components for an ion which is initially in the Maxwellian plasma and subsequently passes through the 3
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electrostatic potential. Comparisons for sputtering, backscattering, and implantation between plasma, monoenergetic, and Maxwellian incident ions were carried out at the same average incident energy. Values for the plasma ions were found to be significantly different from the values for the monoenergetic and Maxwellian ions. The differences are attributed to the different distributions of incident angles