Abstract
At the interface between a magnetized plasma and solid surface, a magnetic presheath region exists before the Debye sheath. The subsonic ion flow at the entrance to the magnetic presheath is investigated under divertor-relevant plasma conditions. The collisional sheath problem is investigated with a simple fluid model. Reasonable boundary conditions at the Debye sheath edge are found based on the analysis of the Sagdeev potential. By using a fluid model, the relationship between ion flow at the presheath entrance and the presheath length is evaluated. It is found that the starting value of the ion velocity along the magnetic field lines decreases with the increase of the presheath length for a fixed collisionality, which has a limitation imposed only by the presheath length. Chodura’s sonic ion flow is approached when the presheath length L→0. For a fixed presheath length, the required ion velocity at the presheath entrance decreases with increasing collisionality.
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