Speaker
Description
The Research Racetrack Dipole Demonstrator (R2D2) is a short model magnet developed by CEA Paris-Saclay, in collaboration with CERN. The main goal is to demonstrate the feasibility of key technologies for future high field 16 T Nb3Sn magnets for particle colliders. Using a block-coil design, two different cable grades are wound in the same coil layer, in order to maximize the current density, therefore to minimize the size of the magnet and the use of superconductor. The choice was made of the concept of external joints, for which the cable exits are guided outside of the coil to perform the connections between the cable grades. Two Nb3Sn instrumented single-layer racetrack coils are required to manufacture the magnet. Through the manufacturing of a copper coil, followed by a Nb3Sn practice coil, all the toolings and the manufacturing procedures have been validated. Two coils are now ready to be assembled in the mechanical structure, which has been tested in parallel. An overview of the coil manufacturing experience will be given, with an analysis of the various measurements performed and a feedback on the manufacturing process.
