Magnetic field measurements of JT-60SA CS model coil

Investigation of long time constants of magnetic fields generated by the JT-60SA CS1 module

“…A cold test of the CS1 module was conducted using a test facility which can accommodate testing of a forced-cooling superconducting coil [6,7]. The details of the test facility are described in Refs.…”

“…The details of the test facility are described in Refs. [6,7,10,11]. The helium cryogenics system of the test facility was upgraded in the 2014 Japanese Fiscal Year [12].…”

“…A model coil was fabricated to verify the process of coil manufacturing and fabrication jigs for the CS1 module [3,6,7]. The model coil was wound with a Nb3Sn CIC conductor which was the same as the conductor used for the CS1 module.…”

“…In a coil wound with CIC conductors, the length of which is over several tens of meters, loop currents have been observed in the past [6,[16][17][18][19][20][21]. On the other hand, in a short CIC conductor, the length of which was approximately 1 m, there is no observation of the loop currents [22].…”

“…1, the CS is composed of four modules, CS1, CS2, CS3, and CS4. In the superconducting coil test facility of the National Institute for Fusion Science (NIFS) [6,7], a cold test of the CS1 module was conducted before the CS1 module was installed in the magnet system of the JT-60SA. This paper describes the measurement of self-magnetic fields generated by the CS1 module in the cold test.…”