We describe the progress and status of utilizing two high-temperature superconductors, Bi-2212 round wires and REBCO coated conductors, for accelerator magnet applications in USA, with a focus on the work performed at LBNL and our partners. The talk covers the efforts to improve the consistency of industrial Bi-2212 wire production to achieve high wire engineering current density of > 1100 A/mm2 at 4.2 K and 5 T consistently, to understand the science and technology of Bi-2212 Rutherford cables, results of a campaign to understand and remove ceramic leakage in Rutherford cables, and a new quench detection algorithm and the hardware developed that are effective in enabling early quench detection. For REBCO magnets, we will cover the progress with fabricating canted cosine theta magnets using round CORC® conductors and our efforts in modeling shielding current induced field and mechanical effects and design strategies in controlling them.
This work is supported by the US Department of Energy, Office of Science, Office of High Energy Physics.
Keywords: HTS magnets and materials, REBCO, Bi-2212