THE EFFECT OF MAGNETIC FIELD ON DUST DYNAMIC IN THE EDGE FUSION PLASMA

Abstract

The effect of the magnetic field on dust dynamic and lifetime in the edge fusion plasma has been studied. On the basis of particle-in-the-cell and Monte Carlo methods, a computational model of  evolution of tungsten dust particle formed on the surface of the reactor wall was constructed. In the model the equations of motion, the equations of mass and energy balance, and equations for the dust particle charge are solved. The time dependence of the characteristic parameters (charge, temperature and radius, heat fluxes) of the dust particle were determined. On the basis of these calculations, the tungsten dust lifetime in the edge fusion plasma was estimated. It was found that the magnetic field can have a significant effect on charging processes and the lifetime of dust particles in the edge fusion plasma. The obtained results show that the magnetic field causes a decrease in the charge modulus of the dust particle, which leads to suppression of the heat flux of plasma particles on the dust particle, thereby increasing its lifetime. Also, the magnetic field increases the charging time of small dust particles due to the limitation of the trajectory along the magnetic field lines.

Keywords: Edge fusion plasma, Dust particle charge, Dust lifetime.