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Recent results of JT-60U towards establishment of physics basis for ITER and advanced tokamak operation are presented. Progress in high integrated performance is achieved with improvement of N-NB and ECRF heating systems. In the next experimental campaign 2003～2004, discharge duration with 17 MW heating will be extended up to 30 s for sustaining high-beta plasma longer than the current diffusion time. Superconducting modification of JT-60is planned to demonstrate high-beta plasma sustainment exceeding ideal MHD instability limit without wall stabilization.