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Analytical study of statistical error in coupledfinite-volume/Monte Carlo simulations of the plasma edge

Journal Contribution - Journal Article

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Plasma and neutral transport in the plasma edge region of magnetic confinement fusion devices is often simulated by iteratively coupling a finite volume (FV) code for the plasma with a Monte Carlo (MC) code for the neutral particles. Because of the statistical MC noise, the iterative scheme defines a Markov process for the plasma states. We derived relations between the iterative scheme and the statistical distribution of the plasma states. In this paper, we study in detail, for random noise coupling and in a generalized scalar setting, the relation between the artificial time step used in the iterative scheme and the variance of the plasma states. We show numerically that our new insights, gained from the scalar setting, still hold when simulating a simplified 1D plasma edge model.
Journal: Contributions to Plasma Physics
ISSN: 0863-1042
Issue: 6-8
Volume: 58
Pages: 659 - 665
Publication year:2018
BOF-publication weight:1
CSS-citation score:1
Authors from:Higher Education