Predictive modelling of D-T fuel mix control with gas puff and pellets for JET 3.5 MA baseline scenario

Fuel mix control is a relevant problem in present experiments featuring mixed isotope fusion plasmas, and it will be crucial in future fusion reactors operating with a D-T plasma mixture. To maximise the deuterium-tritium (D-T) thermal reactions the plasma mixture has to be close to 50-50. However, the fusion power can be maximised in presence of D neutral beam injection (NBI) in a T rich plasma, so to favour the beam target component of fusion reactions. Integrated modelling can help explore and compare different fuelling schemes and provide guidance to arrive to a suitable recipe that leads to the desired experimental condition. The starting point for this paper is the wide database of fully predictive simulations carried out in preparation to the D-T operations of the JET baseline scenario. The baseline and hybrid are two ELMy H-mode scenarios envisaged for high fusion performance at JET. In the baseline, featuring low beta, good confinement is achieved at high plasma current. The simulations in this work are performed using the JINTRAC suite of codes using QuaLiKiz as first-principle transport model to predict the plasma current density, the electron density, the D, T ion densities, the electron and ion temperatures, self-consistently with the equilibrium computed by ESCO.