Simulations of ITER Scenario 2 with different schemes of current ramp-up

Abstract

The paper presents the results of a study of the ITER 15 MA inductive Scenario 2 using self-consistent simulations performed with the DINA code. The primary goal was to develop poloidal field scenarios with an early transition from the limiter to divertor magnetic configuration. Such scenarios give the opportunity to reduce the heat flux to the limiters. An algorithm of the online control of the rate of plasma current ramp-up after formation of the divertor configuration (feedback control of the plasma internal inductance) is proposed for such scenarios. The study demonstrates the sensitivity of the resistive losses of the poloidal magnetic flux and the maximum duration of burn to a current at the X-point formation and to a waveform of plasma current ramp-up in the divertor magnetic configuration. It is demonstrated that the linear ramp-up of the plasma current after X-point formation is preferable.