Diffusion of particles from tokamak by stochastization of magnetic field lines

0353401 - ÚFP 2011 CZ eng D - Thesis
Cahyna, Pavel
Diffusion of particles from tokamak by stochastization of magnetic field lines.
Institute of Plasma Physics. Defended: MFF UK, Ke Karlovu 3, 121 16 Praha 2. 15.12.2010. - Prague: Institute of Plasma Physics, 2010. 144 s.
Institutional research plan: CEZ:AV0Z20430508
Keywords : tokamak * deterministic chaos * magnetic islands * edge localized mode
Subject RIV: BL - Plasma and Gas Discharge Physics

The thesis summarizes the current state of research of thermonuclear fusion with magnetic confinement and decribes the possible role of stochastization of magnetic field lines and magnetic perturbations in solving some of the problems that are encountered on the road to fusion. It presents a theoretical introduction to deterministic chaos and explains the connection of this theory to magnetic perturbations in tokamak. Among the results are: the comparison of chaotic diffusion of particles and field lines, where significant differences were found; the application of chaotic diffusion of particles to the problem of runaway electrons originating in disruptions, where our simulations contributed to explaining the experimental results from the JET tokamak; the calculation of spectra of perturbations for the COMPASS tokamak; and modelling of screening of perturbations by plasma, where the observations of divertor footprints show as a promising method to detect the screening.
Permanent Link: http://hdl.handle.net/11104/0192658