Full Wave Modeling of HHFW Heating for WHAM

The Wisconsin HTS Axisymmetric Mirror (WHAM) experiment will utilize up to 1 MW of High Harmonic Fast Wave (HHFW) heating power in the Ion Cyclotron Range-of-Frequencies (ICRF) to preferentially create a high energy sloshing ion population. To provide quantitative predictions of antenna loading and the wave field profile while capturing accurate geometric features, a full wave Finite Element Method (FEM) model has been constructed based on COMSOL Multiphysics' RF module. The model utilizes a cold plasma dielectric tensor with artificial damping, and we will report on the progress of implementing and validating an external iterative solver in which a hot plasma dielectric tensor with a bi-Maxwellian ion distribution function is used to account for parallel spatial dispersion and finite Larmor radius effects. Results from 2D axisymmetric and 3D simulations will be compared across scenarios with different source frequency, plasma density and temperature profiles. Based on these results, a preliminary single loop antenna and transmission line design will be shown along with predicted antenna loading. Finally, the effect of scrape-off layer thickness and density on antenna loading will be demonstrated.