Latest advances in the V3FIT 3D equilibrium reconstruction code

V3FIT is a code that determines the optimal inputs of a 3D equilibrium model by searching parameter space to minimize differences between observable and synthetic signals. Initially built around VMEC, V3FIT is routinely used to reconstruct many 3D equilibria in stellarators, tokamaks, and RFPs. A recent inclusion of the SIESTA equilibrium code has expanded 3D reconstruction to cases with magnetic islands and stochastic fields. In an effort to make V3FIT suitable for island divertor reconstruction of W7-X, this presentation will focus on the implementation of new capabilities. Among these are Gaussian process profiles, a machine learning method for automatic generation of radial profiles; and implementation of the TRAVIS ECE diagnostics for non-optically thick conditions and its extension to non-nested equilibria. We will also report progress on the implementation of a SIESTA free boundary mode for extension of reconstruction into the scrape-off layer.