Coupled Equilibrium-Transport Modeling with Feedback Control in FUSE

FUSE is an open-source, flexible framework for integrated whole-facility modeling of fusion experiments and pilot plants (FPPs). FUSE actors include first-principle, AI/ML, and reduced models that span from the tokamak plasma core all the way to the site boundary, with physics (equilibrium, transport, heating & current drive, stability, scrape-off layer), engineering (1D, 2D, & 3D builds, structural mechanics, neutronics, and coil optimization), balance of plant, costing, and risk. Originally created for FPP design, FUSE can now model the time evolution of both the plasma and plant. We present progress towards a modern, Grad-Hogan-like solver, which couples first-principle equilibrium evolution, high-fidelity transport models, and realistic plasma control. A novel algorithm for coupling coil-current evolution to internal plasma current dynamics has been implemented. Coil/plasma current simulations can be iterated with equilibrium calculations for standalone VDE modeling or pulse simulation with magnetic control via co-simulation with TokSys. We will discuss the underlying models, existing couplings, and ongoing development. This tool will serve as a "flight simulator" that can ensure the accessibility and controllability in experiments and FPPs.