Abstract
AbstractA divertor plasma is treated using a kinetic model to evaluate impurity control effects of an expanding magnetic field and effects of plasma‐neutral collisions on power transmission in a divertor chamber. Cold ions of fuel and ionized impurities are effectively trapped in the divertor chamber by the electrostatic potential caused by magnetic expansion if the ionization rate is smaller than an upper limit. Plasma‐neutral collisions remarkably reduce the impact energy of ions reaching the divertor plates through removal of energetic ions and through reduction of the potential drop in the divertor chamber.
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