The Effect of Magnetic Field on Dust Dynamic in the Edge Fusion Plasma

In this paper, the effect of the magnetic field on dust dynamic and lifetime in the edge fusion plasma has been studied. A computational model of tungsten dust evolution formed on the surface of the reactor wall was constructed on the basis of particle-in-cell and Monte Carlo methods. The time dependence of the characteristic parameters (charge, temperature and radius, and heat fluxes) of the dust particle was determined. On the basis of these calculations, estimates of the tungsten dust lifetime in the edge fusion plasma were made. It was found that the magnetic field can have a significant effect on charging processes and lifetime of dust particles in the edge fusion plasma. The obtained results show that the larger the dust particle size, the stronger the magnetic field affects its charge, which leads to the suppression of the heat flux of plasma particles on the dust surface and an increase in 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.