Diffusion coefficients of Fokker-Planck equation for rotating dust grains in a fusion plasma

Journal Article · Sun Nov 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4935873· OSTI ID:22489891

Bakhtiyari-Ramezani, M., E-mail: [e-mail]; Alinejad, N., E-mail: [e-mail] ^[1]; Mahmoodi, J., E-mail: [e-mail] ^[2]

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1. Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute (NSTRI), 14395-836 Tehran (Iran, Islamic Republic of)
2. Department of Physics, Faculty of Science, University of Qom, Qom (Iran, Islamic Republic of)

In the fusion devices, ions, H atoms, and H{sub 2} molecules collide with dust grains and exert stochastic torques which lead to small variations in angular momentum of the grain. By considering adsorption of the colliding particles, thermal desorption of H atoms and normal H{sub 2} molecules, and desorption of the recombined H{sub 2} molecules from the surface of an oblate spheroidal grain, we obtain diffusion coefficients of the Fokker-Planck equation for the distribution function of fluctuating angular momentum. Torque coefficients corresponding to the recombination mechanism show that the nonspherical dust grains may rotate with a suprathermal angular velocity.

• OSTI ID: 22489891
• Journal Information: Physics of Plasmas, Vol. 22, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ADSORPTION
ANGULAR MOMENTUM
ANGULAR VELOCITY
ATOMS
DESORPTION
DIFFUSION
DISTRIBUTION FUNCTIONS
DUSTS
FOKKER-PLANCK EQUATION
HYDROGEN
IONS
MOLECULES
PLASMA
RECOMBINATION
STOCHASTIC PROCESSES
THERMONUCLEAR DEVICES
TORQUE