Abstract
A high-recycling divertor plasma is treated using a kinetic model to examine impurity retention and power exhaust by charge-exchange collisions in a divertor chamber in which magnetic field is expanded. Cold ions of fuel and ionized impurities are effectively trapped in the divertor chamber by the electrostatic potential caused by magnetic expansion if cold ion density is smaller than an upper limit. Charge-exchange collisions remove momentum of the plasma along field lines and reduce ion heat flow to the divertor plates through removal of energetic ions remarkably.
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