Closure theory for high-collisionality plasmas with multiple ion species

A general formalism is developed for calculating closures for high-collisionality plasmas with multiple ion species. Parallel and transverse closures can be obtained by solving sets of linearized moment equations for arbitrary mass, temperature, charge, density, and collision time ratios. A convergence study increasing the number of moments shows that practically exact coefficients within 0.4% error can be obtained from 3 moment calculations for parallel closures and from 12 moment calculations for transverse closures. As an example study, closure coefficients for a deuterium-carbon plasma are presented for various temperature ratios across the entire Hall parameter range.