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

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.
Authors:
;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22489891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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