-
Author(s):
Y. Tomita, R. Smirnov, T. Takizuka and D. Tskhakaya
-
Title:
Effect of Oblique Magnetic Field on Release Conditions of Dust Particle from
Plasma-Facing Wall
Date of publication:
Aug. 2007
-
Key words:
Dust, divertor plasma, electric field, oblique magnetic field
-
Abstract:
Effects of oblique magnetic field on release condition of a spherical dust
particle from a plasma-facing vertical wall is studied analytically. The
magnetic presheath and the Debye sheath are coupled to obtain the plasma
quantities and the electric field at the wall, which are necessary to
analyze the release condition. It is clarified that for the deeper potential
drop inside the Debye sheath than the floating one the critical radius for
release increases as the magnetic field approaches parallel to the wall. The
smaller dust than the critical one can be released from the wall. On the
other hand in the case of the shallower potential drop the critical radius
disappears at some angle of the oblique magnetic field. From this analysis
we find that the size of the released dust particle can be controllable by
adjusting the plasma parameters such as plasma density and temperature as
well as biasing the wall potential.
-
|
