Jet results in D-T divertor plasmas

Recent results obtained during the first part of the JET D-T phase are presented. Emphasis is placed on conditions carefully set to be similar to those required in ITER. Wall loading changeover from 100% deuterium to 90% tritium was achieved in about twenty discharges with 100% tritium injection. H mode threshold power was found to have inverse isotopic mass dependence whereas there was little mass dependence of global energy confinement time in the ELM free or ELMy H mode discharges. Preliminary results are consistent with the gyro-Bohm physics form of global energy confinement time. This form has a weak negative mass dependence but a stronger density dependence than the ITERH93-P form. The second harmonic ICRH ITER reference scenario (2 omega(CT) with and without the addition of a small amount of He-3) was assessed in JET D-T plasmas. High performance combined heating (neutral beam + ICRH) hot ion and optimized shear regime experiments were carried out with only half the installed neutral beam power. Nevertheless, internal confinement barriers in the optimized shear regime were also demonstrated in D-T plasmas.