Integrated Performance and Critical Issues Towards Steady-State Operation in JT-60U

摘要

This paper reports the integrated performance, achieved in JT-60U, towards the steady-state operation foreseen in ITER and DEMO reactor. Advanced tokamak plasmas with weak shear or reversed shear have been optimized to confront the critical issues such as the high-beta operation with high confinement, the compatibility of high-density operation with high confinement, and long sustainment with high non-inductive current drive. As a result, high-integrated performances were achieved in both plasma regimes. For example, high confinement reversed shear plasmas with high bootstrap current fraction exceeding no-wall beta limit are obtained in reactor relevant regime, where β_N ~ 2.7, β_p ~ 2.3 is achieved with reversed q profile with q_(min) ~ 2.3, and then HH_(98y2) ~ 1.7, n_e-(GW) ~ 0.87 and f_(BS) ~ 0.9 are also obtained at q-(95) ~ 5.3.