Status of Winding and Forming Technology Development for CFETR CSMC

The central solenoid model coil (CSMC) for China Fusion Engineering Test Reactor (CFETR) is being developed in ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences). It is a hybrid superconducting magnet of 12 T maximum magnetic field and 1.5 T/s changing rate, which is composed of Nb3Sn coils and NbTi coils in high and low magnetic fields, respectively. The coil continuous winding and forming is one of the key manufacture technologies for CSMC. This paper describes the developing status of the coil winding and forming processes. Based on the short sample bending trials, the winding design and optimization have been completed. At present, the winding production line has been constructed and is subjected for debugging. The forming tools for joggles and leads are being tested. Several technical issues during trials have been solved, e.g., the vertical plastic deformation of the coil and the keystoning of bent conductor. As a result, the continuous winding and forming trial for quad-pancake (QP) of Nb3 Sn inner coil has been conducted successfully, and presented here.