Tungsten transport due to the neoclassical toroidal viscosity induced by resonant magnetic perturbation in the EAST tokamak

The impact of neoclassical toroidal viscosity (NTV) induced by resonant magnetic perturbations (RMPs) on tungsten has been studied in EAST. Modeling results from NTVTOK show that the NTV effect on low charge state tungsten ions is greater than that on high charge state tungsten ions, and the effective transport coefficient of W 20 + is only on the order of 10( - 4) - 10( - 3) m( 2) / s, while the effective transport coefficient of W 1 + can reach 0.1-1 m( 2 )/ s, which is close to the 2D neoclassical diffusion coefficient of W 1 +. The flux of W 1 + exhibits a clear phase dependence on the RMP spectrum, and the W 1 + flux obtained from NTVTOK is higher at low toroidal mode numbers compared to high toroidal mode numbers of RMPs, which is qualitatively consistent with EAST experiments.