Steady state plasma performance on JT-60U

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Abstract
Recent results from JT-60U on high performance experiments and studies on steady state plasma are presented. High fusion performance of nD(0) tau ETi(0)=1.1*1021m-3s keV, Sn=5.6*1016s-1, QDT=0.6, Ti(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 pN<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.