| Popis: |
The problem of the evolution of an ion beam in a fully ionized plasma is investigated using computer simulation. The 2D-3V axisymmetric composite numerical model is based on the particle-in-cell (PIC) method for both the ion component of the background plasma and the ion beam. The magnetohydrodynamics (MHD) approximation is used for the plasma electron component. Possibilities of using the PIC method for research non-stationary phenomena in astrophysics and plasma physics are limited due to the large difference in the masses of ions and electrons. We use a different approach, the hybrid MHD-PIC, which reduces computational costs and takes into account the final size of the Larmor radius of ions. When solving the kinetic equations by the particle-in-cell method, Cartesian coordinates are used, and then the reverse transition to cylindrical coordinates is carried out. As a result of computer simulation, the evolution of the ion beam depending on its energy and current, magnetic field and plasma density is studied. The possibility of forming regions with a low plasma density and a displaced magnetic field is shown. |
