Персона: Степаненко, Александр Александрович
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Equations and improved coefficients for parallel transport in multicomponent collisional plasmas: Method and application for tokamak modeling
© 2021 Author(s).New analytical expressions for parallel transport coefficients in multicomponent collisional plasmas are presented in this paper. They are improved versions of the expressions written in Zhdanov [Transport Processes in Multicomponent Plasma, English ed. (Taylor and Francis, London, New York, 2002)], based on Grad's 21N-moment method. Both explicit and approximate approaches for the calculation of transport coefficients are considered. Accurate application of this closure for the Braginskii transport equations is discussed. Viscosity dependence on the heat flux is taken into account. Improved expressions are implemented into the SOLPS-ITER code and tested for deuterium and neon ITER cases. Some typos found in Zhdanov [Transport Processes in Multicomponent Plasma, English ed. (Taylor and Francis, London, New York, 2002)] are corrected.
Impact of the improved parallel kinetic coefficients on the helium and neon transport in SOLPS-ITER for ITER
© 2021 The Authors. Contributions to Plasma Physics published by Wiley-VCH GmbH.New Grad–Zhdanov module is implemented in the SOLPS-ITER code and applied to ITER impurity transport simulations. Significant difference appears in the helium transport due to improved parallel kinetic coefficients. As a result, 30% decrease of the separatrix-averaged helium relative concentration is observed for the constant helium source and pumping speed. However, for the neon changes are less pronounce. Change of the impurity behaviour is discussed. For the first time the ion distribution functions are studied in the ITER scrape-off layer conditions to reveal the origin of the kinetic coefficient improvements and theory limitations.