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

Journal Article · Sat Nov 14 23:00:00 EST 2015 · Physics of Plasmas

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

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, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 22; ISSN PHPAEN; 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