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Recent progress on CORC® cable and wire development and their application in prototype accelerator magnets
Description
Abstract: Advanced Conductor Technologies has been developing high-temperature superconducting (HTS) Conductor on Round Core (CORC®) cables and wires wound from ReBa2Cu3O7-δ (REBCO) coated conductors for use in high-field magnets that would ultimately operate at fields exceeding 20 T. An overview of the development CORC® conductors for accelerator magnets is presented, with the goal to meet the stringent requirements of operating currents of 5 – 10 kA and engineering current densities (Je) of 400 – 600 A/mm2 at 4.2 K in a background field of 20 T. The push to reach higher current densities and improved conductor flexibility will be highlighted, where a reduction of the substrate thickness from 50 to 30 µm, and recently to 25 μm has allowed a Je of 450 A/mm2 at 20 T in long-length, high-quality CORC® wires.
CORC® cables and wires have matured into practical magnet conductors that are now being implemented into several prototype accelerator magnets. Canted-cosine-theta (CCT) accelerator magnets are being developed at Lawrence Berkeley National Laboratory, and recently reached a dipole magnetic field of 2.9 T, while a 5 T CCT magnet is currently under development. Brookhaven National Laboratory is developing a Common Coil insert magnet using CORC® cables, that should reach a combined dipole field of 13 T when operated in series with a 10 T LTS outsert.
A CORC® cable insert solenoid was developed in collaboration with the National High Magnetic Field Laboratory and was recently tested in a 14 T background magnetic field. The 45-turn CORC® cable solenoid was designed to operate at high current, high current density, and high Hoop stress; a combination that is essential in the development of low-inductance high-field cable magnets. The CORC® cable insert solenoid was successfully tested in liquid helium in background magnetic fields of up to 14 T, where it could be safely operated within the flux flow regime. The CORC® insert solenoid demonstrated a critical current of 4,404 A in a 14 T background field, resulting in a combined central magnetic field of 15.86 T and a peak magnetic field on the conductor of 16.77 T. No significant degradation in critical current was measured after 16 high-current tests in high magnetic field, clearly demonstrating the robustness of the CORC® cable in high-field magnet applications. To our knowledge, the successful test was the first HTS insert magnet test at currents over 1 kA in a significant (or any) background magnetic field.
Jerome Fleiter
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