Moderate beta baseline scenario in preparation to D-T operations at JET

In 2021, JET will operate with a D-T plasma mixture. To achieve high fusion power with a steady performance, two ELMy H-mode scenarios are under development: the baseline scenario, with low βN where good confinement is achieved at high current and the hybrid scenario, at lower current and higher βN, with a shaped current profile. Most of the extrapolations done for baseline plasmas used as reference one of the baseline most performing pulses with a βN ≈ 2.2 which is higher than usual in typical baseline pulses. In this work we present the results of the predictive simulations done with the JINTRAC suite of codes and the QuaLiKiZ transport model, using as reference a more conventional baseline with q95 ≈ 3 and βN ≈ 1.8. The simulation settings and the transport model have been validated against the experimental results obtained in D-T plasma mixture during DTE1, when JET was equipped with a carbon wall, and against the experimental results obtained in D plasmas both with the C wall and the ITER-like wall (Be/W) installed in 2011. The extrapolations to D-T plasma mixture at high current show that 10 MW of fusion power are achievable in a wide range of experimental conditions, while 15 MW of fusion power could be approached only with full auxiliary power (40 MW)in particularly pure plasmas.