Development of Central Solenoid for JT-60SA

Concept design of the CFETR central solenoid

“…The superconductor should be in a steady state at any operation scenario such as plasma disruption at peak magnetic field [7]. The maximum magnetic field which appears on the inside area of CS coils is set to be lower than 13 T according to the performance of Nb 3 Sn material at 4.5 K. The central solenoid can be roughly taken to be infinite in length because the radial dimension of central solenoid is far less than its axial size.…”

Modeling of Butt Joint Composed of Nb₃Sn Cable-In-Conduit Conductors

“…The joint sample is composed of Nb 3 Sn CIC conductors [1,2] used in the JT-60SA CS coil. The conductor conauthor's e-mail: obana.tetsuhiro@LHD.nifs.ac.jp * ) This article is based on the presentation at the 23rd International Toki Conference (ITC23).…”

“…Figure 4 shows the measurement results of joint resistance. The measurements indicated that the performance of the butt joint fulfilled the design requirement in which the joint resistance was less than 5 nΩ at 2 T [2,5]. In addition, to investigate stable operating conditions of the butt joint, a stability test was performed using the joint sample.…”

“…The butt joint is very attractive for central solenoid (CS) coils of tokamak machines because it allows embedding of the joint into a winding pack that provides maximum magnetic flux at a given peak field in the winding [1]. The butt joint was adopted for JT-60 Super Advanced (JT-60SA) CS coils composed of Nb 3 Sn cable-in-conduit (CIC) conductors [1,2].…”

Electrically insulated MLI and thermal anchor

“…In JT-60SA, the thermal shields surround the magnet system [2] and shield it against the radiation from the vacuum vessel, the ports, and the cryostat. The thermal shields are composed of several sections namely the Cryostat Thermal Shield -CTS, the Port Thermal Shield -PTS, and the Vacuum Vessel Thermal Shield -VVTS.…”