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 simil ar to those required in ITER. Wall loading changeover from 100% deuter ium to 90% tritium was achieved in about twenty discharges with 100% t ritium injection. H mode threshold power was found to have inverse iso topic mass dependence whereas there was little mass dependence of glob al 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 dep endence but a stronger density dependence than the ITERH93-P form. The second harmonic ICRH ITER reference scenario (2 omega(CT) with and wi thout the addition of a small amount of He-3) was assessed in JET D-T plasmas. High performance combined heating (neutral beam + ICRH) hot i on and optimized shear regime experiments were carried out with only h alf the installed neutral beam power. Nevertheless, internal confineme nt barriers in the optimized shear regime were also demonstrated in D- T plasmas.