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Looking into the future of CERN’s higher energy Accelerators, as in the Future Circular Collider (FCC) and beyond, 16T magnetic fields and above are needed. High Temperature Superconductors (HTS) are now delivering ultra-high fields, with 30 Tesla and higher being achieved by many groups around the world. CERN has the first results of using a high current (10 kA) HTS, with REBCO cables, in an Accelerator type magnet development. This paper presents the multiple technologies and new concepts that were used in the design, build, and testing of a set of high current dipole models. We present the technology advancements in the areas of: advanced modelling, materials used in the magnet construction, quench detection and protection, and field quality. Finally, we take a glimpse at CERN’s exciting 20+ Tesla accelerator conceptual magnet designs. (This summary was ghost authored by T W Bradshaw on behalf of the presenter who is currently undergoing treatment. All involved in ICEC – ICMC wish to congratulate Glyn on his presentation and wish him a speedy recovery) 1. Summary of the talk The talk looked at the studies on future circular high energy colliders that have been proposed. A critical parameter is the magnetic field that can be produced to deflect the beam, this keeps the size of the device manageable. There followed a brief review of high field superconducting magnets (most of which are solenoids). The technology for these magnets uses HTS (High Temperature Superconductor) coil inserts to produce fields in excess of 30T. The highest to date is the 32T magnet at the National High Magnetic Field Laboratory in Tallahassee, Florida, US. Existing high field accelerator magnets (Dipoles and Quadrupoles) can give up to 11T (CERN high luminosity project) which are based on Nb3Sn technology. In development are magnets to give fields in the region of 16 to 20T. Several laboratories around the world are engaged in this endeavour. Highlighted was the CERN Fresca2 14.6T 100mm aperture dipole. In the quest for even higher fields HTS superconductors at low temperatures can be used. The limit for the use of these materials is far beyond 20T although they are limited by the expense. The Rare Earth Barium Copper Oxide (REBCO) conductors hold the promise of being affordable in a few years. The processing of the material using the Powder In Tube (PIT) method to produce multifilamentary wire was described – this uses a silver tube on the outside. Early coils made from this process exhibited leakage caused by bubble formation and chemical incompatibility. Improvements resulting from new processing techniques have nearly doubled the current carrying capacity of the wire. BSCCO (Bismuth Strontium Calcium Copper Oxide) wire has good performance but the heat treatment requirement is extremely demanding, particularly in that a gas over pressure, with a flow of Oxygen is needed to prevent wire leakages. For large coils a pressure vessel system is required. REBCO (Rare Earth Barium Copper Oxide) conductors are usually made in tape form, which is available from a variety of suppliers. Long lengths are available. The options for manufacturing cables

Next generation materials for future magnet development at CERN