Steady state plasma performance on JT-60U

Recent results from JT-60U on high performance experiments and studies on steady state plasma are presented. High fusion performance of n_D(0) tau _ET_i(0)=1.1*10²¹m^-3s keV, S_n=5.6*10¹⁶s^-1, Q_DT=0.6, T_i(0)=40 keV has been obtained in the regime names 'high- beta _p H-mode'. By intensive survey on pressure/current profile control, beta limit has been substantially expanded: beta _p<or=4.3, beta _N<or=4.0%mT/MA. As a result, up to 10 seconds of quasi steady state high confinement discharges, with a substantial bootstrap current fraction have been experimentally demonstrated. Up to 3.6 MA of plasma current has been driven by LHCD. In low current (<or=1.2 MA), full non-inductive current drive has also been achieved by NB and NB+LHCD.