Development of full electromagnetic plasma burn-through model and validation in MAST

Abstract This paper describes the improvement of the electromagnetic plasma burn-through model. Full circuit equations describing the currents in solenoid, poloidal field coils, and toroidally conducting passive structures have been integrated into the differential equation system of the plasma energy and particle balances in DYON. This enables consistent calculation of the time-evolving loop voltage at a plasma position only using operation signals in a control room, which are current (or voltage) waveforms in solenoid and poloidal field coils and prefill gas pressure. The synthetic flux loop data calculated in the modelling agrees well with the measurement in MAST, confirming the validity of the loop voltage calculation. The electromagnetic modelling also enables calculation of 2D time-evolving poloidal magnetic flux map, thereby modelling the plasma volume evolution during the plasma …