NB3SN SUPERCONDUCTING STRAND DEVELOPMENT IN JAPAN FOR ITER

The development work of the high-performance Nb3Sn superconducting str and for the Center Solenoid Coil, a high-field large pulse coil, of th e International Thermonuclear Experimental Reactor (ITER) have been pr ogressed by Japan Atomic Energy Research Institute with Japanese wire and cable companies. The main required performances for the 0.8 mm-dia meter chromium plated strand were 550 A/mm(2) or higher as the critica l current density at 12 T and 200 mJ/cm(3) or lower as the hysteresis loss for +/-3T. As the result of research and development work, the re liable manufacturing process of the high-performance strand was establ ished, and the mass-production for the ITER Center Solenoid Model Coil was started.