An EDDY/particle-in-cell simulation of erosion of plasma facing walls bombarded by a collisional plasma

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  • An EDDY particle in cell simulation of erosion of plasma facing walls bombarded by a collisional plasma

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<jats:p> To investigate the erosion of a plasma-facing wall intersecting an oblique magnetic field, we performed a kinetic particle-in-cell (PIC) simulation of magnetized plasma, in which collision processes between charged and neutral particles were taken into account. Sheath formation and local physical quantities, such as the incident angle and energy distributions of plasma ions at the wall, were examined at a plasma density of 10<jats:sup>18</jats:sup> m<jats:sup>-3</jats:sup>, a temperature of 10 eV, and a magnetic field strength of 5 T. The erosion rate of a carbon wall was calculated using the ion–solid interaction code EDDY. At a high neutral density (>10<jats:sup>20</jats:sup> m<jats:sup>-3</jats:sup>), the impact energy of the ions dropped below the threshold for physical sputtering, so that the sputtering yield was drastically decreased and wall erosion was strongly suppressed. Sputter erosion was also suppressed when the angle of the magnetic field with respect to the surface normal was sufficiently large. </jats:p>

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