What did scientists discover?
High-field magnets such as accelerator magnets at CERN (with which the Higgs boson was discovered) require superconducting cables carrying currents of over 10,000 amps (A). Superconducting cables used in these magnets are currently limited to magnet fields of about 16 teslas T. A new type of superconducting cable, called CORC® cable, was successfully tested at high field at the MagLab, opening the door for the next generation of accelerator magnets operating at 20 T and above. The measurement showed that high-temperature superconducting CORC® cables are capable of carrying more than 7,000 A in a 5.1 mm diameter cable, while in an externally-applied magnetic field of 17 T.
Why is this important?
Superconducting high-field magnets are wound from cables that must carry a very high current in a small cross-section. No currently available superconducting magnet cables can be operated at fields above 20 T. Our work is important because the current density measured in the CORC® cable of 344 A/mm2 at 17 T establishes a new record that is sufficiently high to enable the next generation of high-field magnets that will operate at fields above 20 T. This work is also important because it showed that the CORC® cable was able to survive Lorenz forces of 120,000 N/m (over 13 tons per meter).
Who did the research?
D.C. van der Laan1, J.D. Weiss2, L.F. Goodrich2, P. Noyes3, U.P. Trociewitz3, A. Godeke3, D. Abraimov3, A. Francis3 and D.C. Larbalestier3
1Advanced Conductor Technologies, U. of Colorado; 2U. of Colorado; 3National High Magnetic Field Laboratory
Why did they need the MagLab?
THE TOOLS THEY USED
This research was conducted in the Cell 4 (Large-bore resistive magnet), at the MagLab's DC Field Facility.
The MagLab is the only facility in the world able to test high-temperature superconducting cables at magnetic fields as high as 17 T. Their large-bore resistive magnet has enough room for the cable and its support system to fit, while running currents as high as 10,000 A through the cable.
Details for scientists
- View or download the expert-level Science Highlight, Record current density in superconducting CORC® magnet cables at 20 T
- Read the full-length publication, Engineering current density in excess of 200 A/mm2 at 20T in CORC® magnet cables containing RE-Ba2Cu3O7−δ tapes with 38 μm thick substrates, in Superconductor Science and Technology .
This research was funded by the following grants: Boebinger (NSF DMR-1157490), D.C. van der Laan (DOE DE-SC0014009, DE-SC0009545)