Study of kink instability and current relaxation by three dimensional macroscale particle simulation
Abstract
Using the macroscale particle simulation code (MACROS code), the authors were able to study nonlinear particle transport on the magnetohydrodynamics (MHD) (large time and space) scales. The authors apply a semiimplicit version of the MACROS code to problems with a change in the magnetic field structure. They first study qualitatively and quantitatively a pure MHD phenomenon, an ideal kink instability (m/n equals 1/1). A simple tokamak system with no toroidal effect is used to simulate the time evolution of the instability starting from a typical initial configuration. They observe an occurrence of the kink instability whose growth rate gamma MACROS given by the MACROS code takes a value up to, but not greater than twice the linearanalytical value of gamma linear. Secondly, they study a current relaxation process from an initial nonequilibrium to a forcefree like equilibrium configuration. They find that kinetic effects may contribute to the relaxation process of the magnetic field current system.
 Publication:

Plasma Physics and Controlled Nuclear Fusion. Nonlinear Phenomena in Fusion Plasmas: Theory and Computer Simulation
 Pub Date:
 April 1991
 Bibcode:
 1991ppcn.proc..135T
 Keywords:

 Computerized Simulation;
 Magnetic Field Configurations;
 Magnetohydrodynamic Stability;
 Magnetohydrodynamics;
 Tokamak Devices;
 Nonlinearity;
 Three Dimensional Models;
 Plasma Physics