Present status of JT-60

The Japan Atomic Energy Research Institute has been constructing a large tokamak JT-60, which constitutes a focus of the second phase (1975-□) of the Japanese fusion development program. Its objective is to investigate plasma confinement and heating in reactor-grade hydrogen plasmas and to conduct an integrated test of associated fusion technologies. It has a long-pulse capability of 5–10 s in pulse length and, among other features, has a magnetic limiter (divertor), various methods of supplementary heating, and radiofrequency current drive. Construction of the JT-60 device, which started in April 1978, will be completed in April 1985. Development of heating devices has been successful, and full installation and test of the heating devices of 30 MW in absorbed power in plasmas will be completed by July 1986. The present paper describes the JT-60 project for its objective, device features, status of construction and development, and its experimental program.