Full-pulse simulations for SPARC using MOSAIC

MOSAIC (Modelling framewOrk for ScenArIo and Control) is a flexible, modular simulation framework built for efficient planning and optimization of the pulse scenarios needed to achieve the target missions of the SPARC tokamak. The framework supports predictive full-pulse, time-dependent simulations with medium-fidelity plasma models at close-to-real-time computational speeds in order to enable automated optimization of actuator trajectories that satisfy the device constraints and maximize the likelihood of achieving the mission of the scenario. Control-oriented models are derived from the actuator and plasma parameter trajectories in order to support separate closed-loop calculations for control development and testing, particularly for off-normal event response. The first application of MOSAIC illustrates the integration of the Matlab EQuilibrium (MEQ) tools and the core transport solver RAPTOR with reduced models for divertor PFC sputtering and heat flux constraints in order to establish the target pulses demonstrating Q > 1 operation. MOSAIC will provide a framework for broad community participation in developing scenario and control solutions for SPARC and ARC that easily translate to the proprietary control system platforms developed at Commonwealth Fusion Systems.