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ú{}CNO‰reBžpwï Vol. 22 No. 1 2005 (3_11)
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Dynamics of Fine Particles in a Complex Plasma
Osamu ISHIHARA
Abstract
Dust particles in a plasma are charged either negatively or positively and are subject to various types of forces in a plas­
ma, including a drag force by plasma particles and a force due to collective nature of a plasma. Dust particles are found
in layers in ground experiments balanced dominantly by the gravitational force and the electric force, while dust particles
in the gravitation­free environment form three dimensional structures subject mainly to forces of ion/neutral drag and
the electric ˆeld. Dynamic motion of ˆne particles in a complex (dust) plasma is reviewed with the emphasis of collective
nature of plasmas.
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¡l‘§åwåw@Hw¤†@ §240_8501 ¡lsÛy–JæíÕä79_5
Faculty of Engineering, Yokohama National University 79_
5 Tokiwadai, Hodogaya­ku, Yokohama 240_8501, Japan
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Fig. 1
Wake potential behind a dust particle in the ion ‰ow.
Mach number M1.5. Three­dimensional view of the
potential structure and its projection on r­z plane. (a)
View from the positive potential. (b) Side view to show
the oscillating potential. A large negative potential at
the front, indicating the presence of a dust particle, is
followed by a large positive potential and then an oscil­
latory nature in space.
J. Jpn. Soc. Microgravity Appl. Vol. 22 No. 1 2005
Ä¢éD
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Surface plot of the ion density, showing ion focusing be­
hind the dust particles, for three diŠerent separations D
between two dust grains. D(a) 0.8 lDe (b) 0.4 lDe (c)
0.2 lDe. M 2 . Dust particles are placed perpendicu­
lar to the ion ‰ow. (From Ref. 29)
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(1 kG/B) msec ðgÁÄ\³êéD_Xg÷±qn̞Ô
Fig. 3
Contour plots of the plasma potential for two dust grains
separated by four diŠerent distances. The plot is
presented in the gray scale topographic style. Note that
the potential wells (region B) are formed behind the
dust grains. The potential wells merge together when
the separation distance is less than the electron Debye
length. (From Ref. 29)
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Fig. 4
Trajectory of a dust particle in a plane perpendicular to
the magnetic ˆeld, which is in parallel with the gravity.
|Zd|eB/md0.17(k1/md)1/2. Initially a dust particle is
injected in a clockwise direction with velocity 0.05 r0(k1/
md)1/2. (From Ref. 38)
J. Jpn. Soc. Microgravity Appl. Vol. 22 No. 1 2005
zuƵÄÀèÈ\¢ª¾ç©É³ê46)C¯Só̅k\
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16340179̕¬ð¾Äißçê½D
Spindle­shaped Coulomb cluster formed in the molecu­
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particles. (a) Side view. (b) Projected view. (From
Ref. 52)
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