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

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This paper reports on the integrated performance achieved in JT-60U toward the steady-state operation foreseen in the ITER and DEMO reactors. Advanced tokamak plasmas with weak shear or reversed shear have been optimized to confront critical issues such as high-beta operation with high confinement, the compatibility of high-density operation with high confinement, and long sustainment with a high non-inductive current drive fraction. As a result, high-integrated performance was achieved in both plasma regimes. For example, high-confinement reversed shear plasmas with a high bootstrap current fraction exceeding the no-wall beta limit have been obtained in the reactor relevant q95∼5.3; high values of βN∼2.7, HH98y2∼1.7, ne/nGW∼0.87, and fBS∼0.9 are simultaneously achieved with a reversed q profile with qmin∼2.3.