Systematic Study of Tungsten Impurity Transport in Representative Regimes of Divertor Plasma

The tungsten impurity transport has been studied by IMPGYRO code for a model tokamak geometry of JT-60U tungsten experiments. The background plasma profiles calculated from SOLPS has been used. The density profiles of tungsten are compared between the low background deuterium density (Case A: nD+ = 2.0 × 10¹⁹ m^-3 at core side boundary) and the high background deuterium density (Case B: nD+ = 3.0 × 10¹⁹ m^-3 at core side boundary). In both cases, flow reversal in the SOL has been observed. The impurity density profile in the SOL is more localized for Case B. These features are possibly explained by the force balance between the thermal force and the friction force.