Manufacture and test of a 5 T bi-2223 insert coil

• Published in: IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.1484-1487
• Main Authors: Beckenbach, M., Hornung, F., Klaser, M., Leys, P., Lott, B., Schneider, T.
• Format: Article
• Language: English
• Subjects: A defects; Applied sciences; BSSCO wires; COILING; Coils (windings); critical current; DEFECTS; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; High temperature superconductors; hybrid LTS-HTS magnets; Inserts; MAGNETIC FIELD; Magnetic fields; Magnetic properties; MANUFACTURE; Manufacturing; Materials; n-value; Prototypes; QUENCHING MECHANISMS; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Steel; Superconducting coils; Superconducting devices; Superconducting films; Superconducting magnets; Superconducting tapes; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TAPE; Testing; Training; Various equipment and components
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2005.849137

With the goal of obtaining a magnetic field of 25 T in our facility HOMER II with a superconducting LTS-HTS hybrid magnet, a first prototype 5 T high temperature superconducting (HTS) insert coil has been constructed and tested. The HTS insert consists of 16 double pancakes made of stainless steel reinforced Bi-2223 tapes manufactured by American Superconductor. The HTS coil was operated at 1.8 K and produced 5.4 T at a current of 151.2 A. In a background field of 11.5 T provided by our facility HOMER I, a total field of 16.9 T was obtained several times. No training or quench of the coil was observed during the test, but after warming up a defect in the winding of one double pancake was detected, presumably due to a ballooning of the tape. The design of the coil and the results of the test are presented and discussed.