A Parametric Study of Extended-MHD Drift Tearing
Abstract
The linear drift-tearing mode is analyzed for different regimes of the plasma-, ion-skin-depth parameter space with an unreduced, extended-MHD model. New dispersion relations are found at moderate plasma and previous drift-tearing results are classified as applicable at small plasma . 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 , verification exercises with unreduced, extended-MHD models in the small plasma- regimes are impractical. The new dispersion relations in the moderate plasma- 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.
Cite
@article{arxiv.1407.3864,
title = {A Parametric Study of Extended-MHD Drift Tearing},
author = {Jacob R King and Scott E Kruger},
journal= {arXiv preprint arXiv:1407.3864},
year = {2014}
}
Comments
22 pages, 7 figures