Recent results and modification program of JT-60 toward high integrated performance

The first half of this paper briefly describes the major achievements of the existing JT-60U machine, i.e., high-performance plasma with full noninductive current drive, long time sustainment of high-beta plasma, and real-time neoclassical tearing modes (NTM) suppression experiments. In addition, the ongoing minor modification of the pulse length prolongation for further enhancement of numerous plasma properties is mentioned. The second half describes the major modification program for the next generation full superconducting coil tokamak called JT-60SC. The object of JT-60SC is to help in the design of DEMO reactor which will improve the attractiveness of fusion power plants from the economical and environmental viewpoints. The present status of the machine design and major technological developments are also presented.