Abstract
A simple model of the collisional divertor plasma indicates that neutral gas collisions should be important in determining the power transmission factor at the transition layer. Inflow of low-energy electrons created by ionization reduces the total potential drop at the transition layer, and the reduction of the power transmission factor is remarkable when the particle amplification factor is much larger than 1. The secondary-electron inflow is effectively diminished due to deflection of the electron by the Lorentz force when the electron cyclotron frequency is much larger than the plasma frequency. The electron emission coefficient under the space-charge limitation is reduced to a value much smaller than 1 due to formation of the magnetic presheath when the magnetic angle approaches 90°.
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