A 20 T dipole magnet for future circular colliders requires high-temperature superconducting (HTS) materials such as Bi-2212 and REBCO conductors. These HTS conductors feature higher minimum quench energy compared to the low-temperature superconductors such as NbTi and Nb3Sn conductors, which may significantly reduce the magnet training. REBCO conductors can also enable high-field magnets operating at 20 – 50 K with gas or conduction cooling. Despite the significant potential of HTS accelerator accelerator magnets, the enabling cable and magnet technology remains to be demonstrated, in particular for REBCO conductors. Lawrence Berkeley National Laboratory, as part of the U.S. National Magnet Development Program, is developing high-temperature superconducting magnets with a goal of generating 5 T dipole fields. In collaboration with Advanced Conductor Technologies LLC, we have built several subscale magnets based on the Canted-Cos-Theta (CCT) concept using commercial REBCO Conductor on Round Core (CORC®) wires. We will present the status of magnet technology development, including the latest results on the two-layer and four-layer CORC CCT magnets, and next steps. Our work can contribute to the community effort that enables HTS accelerator magnets as a new paradigm for accelerator magnet technology with a broad impact on high-energy physics, medical and other applications.
Xiaorong Wang is a research scientist at Berkeley Center for Magnet Technology, Accelerator Technology and Applied Physics Division at Lawrence Berkeley National Laboratory. He received a PhD in Electrical Engineering from Florida State University on the quench behavior of REBCO conductors. Together with colleagues and collaborators, he is working on building REBCO accelerator magnets for the U.S. Magnet Development Program.