Temperature gradient effect on impurity-ion transport

Effects of temperature gradient on the impurity transport are considered in MHD regime, taking account of the effects of the inertia of impurity ion and temperature equipartition between ions. For light impurities, the temperature equipartition effect nullifies the temperature screening term. The diffusion flux of heavy impurities largely varied in considering the ion inertia. When the host ion has a long mean free path, the impurity diffusion flux is outward when eta= d ln T sub(i)/d ln n sub(i)>0 with T sub(i) the ion temperature and n sub(i) the ion density. (auth.)