Speaker
Description
As part of the effort to establish Hermes-3 as a simulation tool for the stellarator edge and scrape-off layer, we examine the current implementation of the advanced fluid neutral model.
Due to the toroidal asymmetry of the strike line, stellarator scenarios could be more sensitive to artificial anisotropies in the neutral transport than tokamaks. We therefore evaluate the neutral anisotropy introduced by the pressure-diffusion model by means of simple test cases. This effort leads to an estimation under which conditions a full velocity fluid neutral model might be more opportune.
To further substantiate trust in the Hermes-3 neutral model, we attempt a qualitative comparison of steady-state results to the kinetic neutral model EIRENE, commonly used in conjunction with the fluid plasma model EMC3 as the state-of-the-art simulation suite for the stellarator edge.