Self-consistent reduced model for energetic ion tail formation by ion cyclotron range of frequency (ICRF) power*

A high fidelity simulation capability for self-consistent minority ion heating, such as the combined AORSA-CQL3D model [1], has been available for about 15 years. However, these type of  models tend to be impractical for implementation in time dependent integrated modeling frameworks because of their computational requirements. Here we revisit previous work [2, 3] where TORIC and CQL3D were coupled iteratively through a quasilinear diffusion coefficient formulated in the ion finite Larmor radius (FLR) limit in TORIC and through the nonthermal ion distribution from CQL3D. The TORIC solver employs a reduced model for the ion conductivity valid in the FLR limit, thus greatly reducing the computational requirements relative to AORSA. The Python-based Integrated Plasma Simulator (IPS) [4] will be used to couple TORIC and CQL3D thus providing the test of a workflow that could be used in an integrated modeling calculation.

[1] E. F. Jaeger et al, Nuclear Fusion 46, S397 (2006).

[2] J. P. Lee et al, EPJ Web of Conferences 157, 03028 (2017).

[3] J. O. Lee et al, Plasma Phys. Control. Fusion 60, 025007 (2018).

[4] D. B. Batchelor et al, J. Phys. Conf. Ser. 180, 012054 (2009).