Response of carbon and tungsten surface to deuterium and tritium plasmas
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Amrit Campus
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.