Two-fluid edge plasma stability analysis in divertor tokamak geometry

Plasma in the edge region of tokamaks sets a boundary condition for the core plasma and interacts with plasma facing components. Edge Localized Modes, which occur in some high-confinement mode plasmas, can restrict the pedestal height and send large heat loads to the divertor. This work applies 2DX, a code capable of solving eigenvalue problems of any fluid model [1], to the ideal magnetohydrodynamic (MHD) fluid models associated with the edge region. Currently, this code has been successfully benchmarked against linear ideal MHD codes such as ELITE [2] for simple shifted circle geometry and ballooning dominated cases of peeling-ballooning (P-B) modes [3]. We extend this simple geometry study to peeling dominated cases before studying P-B modes in the more general case of strongly shaped two-fluid plasmas. Moreover, this code can be used to extend analysis of P-B modes across the separatrix to assess the effect of the scrape off layer model on stability. Ultimately, this code can also be benchmarked against non-ideal MHD models.\\[4pt] [1] D.A. Baver et al., Comp. Phys. Comm. 182, 1610 (2011).\\[0pt] [2] H.R. Wilson et al., Phys. Plasma 9, 1277 (2002).\\[0pt] [3] P.B. Snyder et al., Phys. Plasmas 12, 056115 (2005).