A generalized Frenet frame for computing MHD equilibria in stellarators

For the representation of axi-symmetric plasma configurations (tokamaks), it is natural to use cylindrical coordinates $(R,Z,\phi)$, where $\phi$ is an independent coordinate. The same cylindrical coordinates have also been widely used for representing 3D MHD equilibria of non-axisymmetric configurations (stellarators), with cross-sections, defined in $(R,Z)$-planes, that vary over $\phi$. Stellarator equilibria have been found, however, for which cylindrical coordinates are not at all a natural choice, for instance certain stellarators obtained using the near-axis expansion (NAE), defined by a magnetic axis curve and its Frenet frame. In this contribution we demonstrate how to use an \emph{axis-following frame} that we call a 'generalized Frenet frame', as an alternative to using cylindrical coordinates in a 3D MHD equilibrium solver. We see two advantages: 1) the capability to easily represent configurations where the magnetic axis is highly non-planar or even knotted. 2) a reduction in the degrees of freedom needed for the geometry, enabling progress in optimization of these configurations. We discuss the definition of the generalized Frenet frame, and details of the implementation of the new frame in the 3D MHD equilibrium solver GVEC. Furthermore, we demonstrate for a highly shaped QI-optimized stellarator that far fewer degrees of freedom are necessary to find a high quality equilibrium solution, compared to the solution computed in cylindrical coordinates.