Response of carbon and tungsten surface to deuterium and tritium plasmas

Abstract

The interaction between plasma and confining material surface is crucial for better understanding of plasma-wall interactions. In this work, we have studied the interactions of carbon and tungsten surfaces in an oblique magnetic field with deuterium and tritium plasmas using Kinetic Trajectory Simulation (KTS) approach not considering the induced emissions of electrons by incident ions. The parameters including ion reflection coefficient, ion absorption coefficient, total charge density and Thomas Fermi reduced energy at various ion temperatures has been calculated. The choice of plasma facing material surface is also important to study plasma-wall interaction phenomenon. It has been observed that ion reflection coefficient decreases with the increase in ion temperature and its value is comparatively higher on tungsten wall and in tritium plasma respectively. On the other hand the ion absorption coefficient increases due to increase in projectile energy as the ion temperature increases. The total charge density increases linearly with the temperature. The Thomas Fermi reduced energy by carbon and tungsten surface are higher in deuterium plasma and also increases linearly with ion temperatures. For carbon wall the ion reflection coefficient is found to be 0.0076 at 0.5 eV and decreases to 0.0010 at 2.5 eV in deuterium plasma which slightly increases to 0.0085 and 0.0012 at the respective temperatures. Similarly for tungsten wall the ion reflection coefficient is 0.2576 and 0.1164 in deuterium plasma but is slightly higher in tritium plasma which is found to be 0.2582 and 0.1170 at 0.5 eV and 2.5 eV respectively.