A Parametric Study of Extended-MHD Drift Tearing
Abstract
The linear drift-tearing mode is analyzed for different regimes of the plasma-β, ion-skin-depth parameter space with an unreduced, extended-MHD model. New dispersion relations are found at moderate plasma β and previous drift-tearing results are classified as applicable at small plasma β. The drift stabilization of the mode in the regimes varies from non-existent/weak to complete. As the diamagnetic-drift frequency is proportional to the plasma β, verification exercises with unreduced, extended-MHD models in the small plasma-β regimes are impractical. The new dispersion relations in the moderate plasma-β regimes are used to verify the extended-MHD implementation of the NIMROD code [C. R. Sovinec et al., J. Comput. Phys. 195, 355 (2004)]. Given the small boundary-layer skin depth, discussion of the validity of the first-order finite-Larmour-radius model is presented.
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