Manufacture of the Winding Pack and Development of Key Parts for the JT-60SA Poloidal Field Coils

Abstract

Manufacture of poloidal field (PF) coil system in JT-60SA is progressing. Recently, fabrication of the winding machines for equilibrium field (EF) coils and central solenoid (CS) were completed and the winding with the superconducting conductor was started for an EF coil (EF4). A few double pancake (DP) coils for EF4 were fabricated, and it was realized that the error of circularity for DP coils became less than the designed value. Design of the conductor end structure was also progressed. This part had the role of restraining the conductor end to prevent its separation from the winding pack. It was confirmed by the structural analysis that the conductor end structure for CS, which receives the large electromagnetic (EM) force, had sufficient mechanical strength. It was also checked by the cold test that this structure satisfied the designed performance for the electrical isolation in addition to the mechanical performance. Regarding the design of the inlet for CS, mechanical reinforcement was considered for its structure. Final design of CS inlet was determined by structural analysis to confirm the sufficient mechanical strength against the vertical compression induced by EM forces.Index Terms-Conductor end structure, inlet, JT-60SA, poloidal field (PF) coil, winding pack.

Resonance Characteristics and Maximum Turn Voltage of JT-60SA EF Coil

“…The resonance characteristics of the EF4 dummy pancake [7] are almost the same as the resonance characteristics of the real EF4 pancake because the shapes and the insulation configurations of the EF4 dummy pancake are the same as the real EF4 pancake. The EF4 dummy pancake as shown in Fig.…”

“…The resonance characteristics of the EF4 dummy pancake manufactured by the copper dummy conductor [7] were measured to estimate the actual turn voltage of the EF4 coil. The resonance characteristics of the dummy pancake is almost the same as it of the real EF4 pancake since the shapes and the insulation configurations of the dummy pancake are the same as the real EF4 pancake.…”

Mechanical design of the central solenoid assembly for the JT-60SA Tokamak

“…JT-60SA is the tokamak designed to realize the high performance plasma with long duration (100 sec) The superconducting magnet system in JT-60SA has a toroidal field (TF) coil system which consists of 18 D-shaped coils, and a poloidal field (PF) coil system which consists of 4 modules of central solenoids (CS) and 6 equilibrium field (EF) coils [3][4][5]. Japan is in charge of PF coil system and EU is in charge of TF coils, respectively.…”