Application of High Voltage Insulation on the Magnet Feeder Superconducting Joints During ITER Machine Assembly

The ITER Magnet Feeders are composed of three main sections which are connected together on the ITER site. During this process, the superconducting busbars which carry the electrical current to the ITER magnets are connected together via superconducting joints. As the magnet system operates under high voltage, it is necessary to apply high voltage insulation over the joints and seamlessly connect it to the existing high voltage insulation on the superconducting busbars. This paper describes the materials and detailed techniques used to apply the high voltage insulation on the superconducting joints in the ITER assembly environment. Prior to performing the work on-site, the entire process was qualified on mock-ups, and a process put in place to qualify the technicians who perform the work. These provisions were put in place so as to ensure the quality of the on-site work.