Abstract
Characteristics of divertor plasmas are studied by using a one-dimensional electrostatic particle simulation code with a binary collision model. Dependence of plasma parameters, such as temperature, flow speed, pre-sheath potential, etc., on the collisionality is investigated in detail. Collisions play an important role in supplying electrons with large velocity parallel to the magnetic field, which can pass through the sheath potential barrier near the divertor plate. The pre-sheath with the scale length of the system size is formed by the collisional relaxation of the velocity distribution as well as by the particle source. The flow speed is increased by this potential and exceeds the sound speed.
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