MHD aspects of fire-hose type instabilities

On MHD waves, fire-hose and mirror instabilities in anisotropic plasmas

Temperature or pressure anisotropies are characteristic of space plasmas, standard magnetohydrodynamic (MHD) model for describing large-scale plasma phenomena however usually assumes isotropic pressure. In this paper we examine the characteristics of MHD waves, fire-hose and mirror instabilities in anisotropic homogeneous magnetized plasmas. The model equations are a set of gyrotropic MHD equat...

Magnetohydrodynamic Waves and Instabilities in Homogeneous Gyrotropic Ultrarelativistic Plasma

In some astrophysical systems the ionized gas may be of such high temperature and so strongly magnetized that relativistic effects and pressure anisotropy must be considered in the magnetohydrodynamic (MHD) model. This paper gives an overview of the characteristics of linear MHD waves and instabilities in homogeneous ultrarelativistic plasmas with gyrotropic pressure. The energy closure is the ...

Some Aspects of Disruptive Instabilities

Nonlinear simulations of macro-instabilities in tokamak plasmas beyond MHD

The simulation of the interaction between macroscopic Alfvén modes and a population of hot ions is one of the challenges in tokamak plasma physics, mainly because of its possible negative impact on the plasma confinement in a future fusion device. The bi-fluid XTOR-2F code [1], using a fully implicit method with an iterative pre-conditioned Newton-Krylov for its solution at every time step has ...

Direct Simulation of Mhd Instabilities in Aluminum Reduction Cells

Introduction. Magnetohydrodynamic (MHD) instabilities in aluminum reduction cells (see Fig. 1) have been the subject of several studies, since the pioneering work of Urata et al. [1]. The interaction between the electrolysis current in the cell and the background magnetic field due to remote currents gives rise to a strong magnetic force acting on the fluids inside the cell. Different kinds of ...