Published 2024-01-01
“…Moreover, the removal
efficiency of light fully ionized impurities, quantified by the ratio between the impurity
diffusivity and effective ion heat conductivity $\frac{{{D_{\text{z}}}}}{{\chi _{\text{i}}^{{\text{eff}}}}}\approx \frac{{1 - {b_{\text{z}}}+ {{4{\omega _{{\text{Dz}}}}}\mathord{\left/ {\vphantom {{4{\omega _{{\text{Dz}}}}}{\omega_\text{r}^{\prime}}}}\right. }{{{\omega_\text{r}^{\prime}}}}}}}{{{{3\left({1+{1\mathord{\left/ {\vphantom {1 {{\eta _{\text{i}}}}}}\right. }{{\eta _{\text{i}}}}}}\right)}\mathord{\left/ {\vphantom {{3\left( {1 + {1 \mathord{\left/ {\vphantom {1 {{\eta _{\text{i}}}}}}\right. }{{\eta _{\text{i}}}}}}\right)}2}}\right. }2}}}$ , increases with an increase of $Z$ mainly due to the smaller impurity finite Larmor radius (FLR) effects
reflected by ${b_{\text{z}}}\propto {1 \mathord{\left/ {\vphantom {1 Z}}\right. }Z}$ . …”
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