Japanese Progress in the Large Coil Task and the High Field Cluster Test Program

In 1982, Japan Atomic Energy Research Institute (JAERI) succeeded in rated operation of two development toroidal coils : 8 T Nb-Ti D shape LCT coil and 10 T Nb₃Sn circular coil. The two successes correspond to scaling-up technology and high field technology of toroidal coil, respectively. These two projects were started in 1978 in JAERI. This paper describes the design concepts, the key parameters, and the experiments of these two coils. The main results, described on the both coils, are cool-down characteristics, superconducting recovery characteristics, discharge characteristics and strain measurements.