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This thesis has two parts, each based on an application of the renormalizationgroup (RG). The first part is an analysis of the ddimensional Coulomb gas. The goal was to determine if the Wilson RG could provide input into particleincell simulations in plasma physics, which are the main family of simulation methods used in this field. The role of the RG was to identify the effect of coarsegraining on the coupling constants as a function of the cutoffs. The RG calculation reproduced established results, but in a more concise form, and showed the effect of the cutoffs on the Debye screening length.The main part of the thesis is the application of the dynamic RG to turbulence in magnetohydrodynamics. After transformation to Elsasser variables, which is a symmetrisation of the original equations, the solution is presented as a functional integral, which includes stirring forces, their conjugates and functional Jacobian. The coarsegraining of the functional integral is represented as a diagrammatic expansion, followed by rescaling, and casting the results into differential equations for the analysis of RG trajectories. Detailed comparisons are made with the NavierStokes limit and with previous calculations for MHD.
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