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Tomita, Yukihiro*; Smirnov, R.*; Chutov, Y.*; Takayama, Arimichi*; Takizuka, Tomonori
Contributions to Plasma Physics, 44(1-3), p.162 - 167, 2004/04
Times Cited Count：2 Percentile：6.49(Physics, Fluids & Plasmas)Electrostatic potential formation due to negatively charged dust particles near a divertor plate is studied by one-dimensional kinetic analysis. It is shown that the negatively charged dust particles reduce the ion-sheath potential drop in front of the plate. Dust particles with a large radius (100 micron) reduce the potential drop significantly despite the low dust-to-plasma density ratio (
10to-8). The plasma particle flux is reduced appreciably by the absorption by the dust particles.
Smirnov, R.*; Tomita, Yukihiro*; Takizuka, Tomonori; Takayama, Arimichi*; Chutov, Y.*
Contributions to Plasma Physics, 44(1-3), p.150 - 156, 2004/04
Times Cited Count：10 Percentile：31.99(Physics, Fluids & Plasmas)Dynamics of dust particles in a divertor plasma is simulated using numerical solutions of dust momentum and charging equations in an electrostatic sheath and an ionizing presheath. Spatial distribution of plasma parameters in a divertor are obtained with particle simulations including ionization by electron-impact. We found that dust particles with a larger radius are incapable to come off a divertor plate. Middle-size dust particles come off the plate but come back to the plate. Smaller dust particles come off the plate and reach an equilibrium position in the divertor plasma.
Tomita, Yukihiro*; Smirnov, R.*; Chutov, Y.*; Takayama, Arimichi*; Takizuka, Tomonori
Purazuma, Kaku Yugo Gakkai-Shi, 6, p.429 - 432, 2004/00
Formation of an electrostatic potential due to negatively charged dust particles near a target plate was studied by one-dimensional kinetic analysis. Immovable dust particles are distributed uniformly inside a system. It is clarified that the negatively charged dust particles reduce the ion-sheath drop. A threshold dust density makes the electric field at the target plate zero. The stationary oscillation appears in the electrostatic potential for the dust density above the threshold. We confirm that this oscillation is the Dust Ion-Acoustic Wave with a wave length of the order of Debye length, where dust charges are effective to determine the coefficient.
Smirnov, R.*; Tomita, Yukihiro*; Takizuka, Tomonori; Takayama, Arimichi*; Chutov, Y.*
Purazuma, Kaku Yugo Gakkai-Shi, 6, p.752 - 755, 2004/00
Dynamics of a single dust particle in near-wall plasma is studied in wide range of dust radii and masses. Dust motion and charging equations are solved in the plasma simulated for sheath and ionizing presheath using one-dimensional particle model. It was found that balance of electric and ion drag forces acting on the dust particle provides two critical dust radii differentiating motion of dust started at the wall between pinned against the wall, short and long-range oscillating. Delayed charging causes the mass dependence of the second critical radius until transition from short to long-range oscillations becomes undistinguishable.
Smirnov, R.*; Tomita, Yukihiro*; Takizuka, Tomonori; Takayama, Arimichi*; Chutov, Y.*
NIFS-784, 9 Pages, 2003/10
Dynamics of dust particles in a divertor plasma is simulated using numerical solutions of dust momentum and charging equations. Spatial distributions of plasma parameters in a divertor are obtained with particle simulations including electron-impact ionization. We find that the large-radius dust particles are not released from the divertor plate. The middle-size-radius particles are released but retuned to the plate. The small-radius particles can be released from the plate.
