Test particle transport in perturbed magnetic fields in tokamaks

TitleTest particle transport in perturbed magnetic fields in tokamaks
Publication TypeJournal Article
Year of Publication1999
AuthorsM. de Rover, A.M.R. Schilham, A. Montvai, N.JL Cardozo
JournalPhysics of Plasmas
Date PublishedJun
ISBN Number1070-664X

Numerical calculations of magnetic field line trajectories in a tokamak are used to investigate the common hypotheses that (i) field lines in a chaotic field make a Gaussian random walk and (ii) that the poloidal component of the magnetic field is uniform in regions with a chaotic magnetic field. Both hypotheses are found invalid in typical tokamak conditions. A test particle transport model in the so-called "collisionless diffusion" limit is presented, based on the field line excursions in numerical simulations. Decorrelation mechanisms that effectively enhance the transport in a stochastic field are investigated. (C) 1999 American Institute of Physics. [S1070-664X(99)02406-4].



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