Benchmarking Chapman-Enskog-Like (CEL) Kinetic Results in NIMROD

In the simplified regime of axisymmetric geometry and fixed magnetic field, steady-state results for the neoclassical, poloidal flow constant are compared between NIMROD and DK4D [1]. These quantities are obtained by evolving the Chapman-Enskog-like drift kinetic equation (CEL-DKE) [2] in NIMROD to steady state, and then taking appropriate moments of the non-Maxwellian part of the distribution. The full CEL approach differs from a traditional delta-f approach in that the lowest-order Maxwellian evolves according to n, T, and \mathbf{V}, which may be advanced using NIMROD's fluid model. The CEL-DKE results are also compared to analytics, as well as to previous results obtained using NIMROD's delta-f DKE implementation [3]. Future work will include using the CEL implementation in NIMROD to better understand the role of island formation in ELM supression by RMPs. [1] B. C. Lyons, S. C. Jardin, and J. J. Ramos, Phys. Plasmas \textbf{22}, 056103 (2015). [2] J. J. Ramos, Phys. Plasmas \textbf{18}, 102506 (2011), [3] E. D. Held, et al., Phys. Plasmas \textbf{22}. 032511 (2015).