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3D NonLinear Progress https://w3.pppl.gov/m3d/index.php
In order to better analyze alternate concept devices as well as advanced tokamaks, the physics capabilities of the 3D extended-MHD code M3D have been generalized to include an option to include more kinetic effects. Finite Larmor radius (FLR) corrections to the energetic ion pressure tensor in the pressure coupling scheme have been derived and incorporated into M3D. This new capability with gyrokinetic ions and fluid electrons has been used to study the effect of background thermal ions on the fish-bone mode, and it was shown that the growth rate is reduced due to Landau damping on the thermal ions. This new capability extends the multi-level capabilities of M3D which also include resistive MHD, two-fluid, and hybrid (MHD background with gyrokinetic energetic particles) models. Another important new capability that was incorporated this year was the addition of an all real space representations to the existing 2D real space and 1D Fourier space, unstructured mesh version of the M3D-code. This will enable the highly desirable computational flexibility for dealing with separatrix configurations. These important advances have been developed in collaboration with NYU and MIT.
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