The ITER correction coils are an integral part of the ITER magnet system, forming a layer of coils inserted in between the toroidal and poloidal field coils. Some of them, such as the six bottom correction coils, will be among the first components to be installed during assembly thus requiring early delivery to the ITER site.
Magnet experts gather around the full-size dummy bottom correction coil prepared for vacuum pressure impregnation. The dummy coil is wrapped inside its glass-polyimide ground insulation (visible on the left side), enclosed inside a thin stainless steel sealed vessel and inserted inside a thick vacuum impregnation mould, clamped all around to provide accurate final dimensions.
Four years ago, in November 2009, the Final Design Review was held in Hefei for this component. Since that time, a new manufacturing line for the correction coils was designed, manufactured or procured, and commissioned by ASIPP, including the winding line, the resin system for vacuum pressure impregnation (VPI), and the laser welding system for case enclosure. All the manufacturing drawings have been designed and approved, the qualification of various manufacturing processes has begun, and the winding qualification is finished.
Wei Jing, team leader at ASIPP for the correction coils, showing model cases to Michel Huguet and, from the ITER Organization, Mark Gardner and Adamo Laurenti. One bottom correction coil model case and one side correction coil model case are visible. (Both are of reduced overall size but with full-size cross section.)
The review panel commended both for the quality of their presentations, fully impressed by the achievements of the R&D and qualification activities. In particular, conductor winding has successfully passed all qualification examinations, opening the way for the winding of the first-of-series ITER correction coil with real superconductor in 2014.
Magnet experts from Europe, Japan, USA and China hear a presentation on the preparation of the manufacturing line by Li Hongwei, Technical Responsible Officer for the correction coils.