Eksenel simetrik olmayan tedirgenimlerin divertor tokamakları üzerindeki etkileri

SUMMARY It is strongly expected that energy consumption of humanity will considerably increase in the next century. The unique long-term solution is to supply fusion energy. The scientists have long tried to obtain energy from the fusion reaction. As a magnetic confinement device in toroidal form, tokamak is one of the experimentally fusion energy production devices, which is widely used. Divertors are used to get cleaner plasma in such devices. In this study, particle motions in a double-null poloidal type divertor tokamak was investigated numerically. Three approach was used. In the first two, the drift motions are neglected, i.e., it is assumed that particles moves along the magnetic field lines. First one is based on modelling tokamak magnetic, field by three, infinitely long, straight wires each carrying codirectioual currents, two for divertors and the middle for the plasma itself. The second one uses more realistic current geometry; three circular wires. Both of the magnetic fields consist n = 1 mode perturbations to simulate the nonaxisymmetries due to the plasma instabilities and the imperfect construction of the field coils. At the last approach, the true particle motion is taken into account under the influence of the magnetic fields used as second approach. V51 Broadening of the magnetic separatrix. both chaotic and coherent structures in magnetic field lines and in particle orbits are observed in three approach by using Poincare sections. Adams-Moulton numerical integration technique was used in calculations. It has been seen that, to see the real effect of nonaxisymmetry on the particle motions and to investigate heat deposition on the divertor plates, one should consider Full particle equations, since the other approximations gives quiet dilFereut phase portraits. The next stages oF this study will be the investigation of the effect of a transversal electric field on the particle drift orbits.