Description
The ITER High Fidelity Plasma Simulator (HFPS), developed by integrating the core-edge-SOL transport modelling code (JINTRAC) with the free-boundary equilibrium evolution code (DINA), has previously demonstrated its ability to model transient core-edge/SOL plasma transport. These studies introduced a novel scheme for the conservation of physical quantities and successfully demonstrated core-edge coupled plasma transport simulations under time-varying conditions, including plasma current ramp-up, L-H transitions, and the update of 2D SOL grids that match the evolving plasma equilibrium.
Building upon these developments, an ITER SRO 5MA Deuterium plasma scenario has been extended to include the H-L back transition and the current ramp-down, towards the development of a full free-boundary coupled core-edge transport scenario. The reliable current ramp-down and plasma termination have been explored by employing various tools for controlling the plasma state, such as the application of auxiliary heating, density control, and plasma shape evolution. Initially, coupled free-boundary and core transport (DINA-JETTO) simulations are developed to establish candidate scenarios satisfying the assumptions and requirements for reliable current ramp-down and plasma termination. Subsequently, coupled free-boundary and core-edge coupled transport (DINA-COCONUT) simulations are developed to validate the core transport boundary conditions, as well as to refine the scenarios by satisfying the requirements for the plasma boundary and targets.