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New analytical expressions for parallel transport coefficients inmulticomponent collisional plasmas are presented in this paper. They areimproved versions of the expressions written in [V. M. Zhdanov. TransportProcesses in Multicomponent Plasma, vol. 44. 10 2002.], based on Grad's21N-moment method. Both explicit and approximate approaches for transportcoefficients calculation are considered. Accurate application of this closurefor the Braginskii transport equations is discussed. Viscosity dependence onthe heat flux is taken into account. Improved expressions are implemented intothe SOLPS-ITER code and tested for deuterium and neon ITER cases. Some typosfound in [V. M. Zhdanov. Transport Processes in Multicomponent Plasma, vol. 44.10 2002.] are corrected.

Equations and improved coefficients for paralleltransport in multicomponent collisional plasmas: method and application for tokamak modelling