Magnetic field measurements of the JT-60SA CS1 module

The JT-60 tokamak is being upgraded to an advanced superconducting tokamak to be called the JT-60 Super Advanced (JT-60SA) at the National Institute for Quantum and Radiological Science and Technology in Japan. In the JT-60SA, the magnet system consists of a central solenoid (CS), 18 toroidal field coils, and six plasma equilibrium field coils. As the CS is composed of four modules, CS1, CS2, CS3, and CS4. Fig.1 shows the photograph of the CS1 module. In the superconducting coil test facility of the National Institute for Fusion Science, a cold test of the CS1 module was conducted before the CS1 module was installed in the magnet system of the JT-60SA. In this conference, the measurement of self-magnetic fields generated by the CS1 module in the cold test is presented. In addition, magnetic fields with long time constants observed in the CS1 module are discussed.31th International Symposium on Superconductivity (ISS2018