Evaluation of Magnetic Field Hysteresis and Flux Creep of a QMG Coil Magnet

• Published in: IEEE transactions on applied superconductivity Vol. 17; no. 2; pp. 2390 - 2393
• Main Authors: Tsuchimoto, M., Osanai, S., Morita, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bulk HTS; Coiling; Creep; Creep (materials); Crystalline materials; Current distribution; Electrical engineering. Electrical power engineering; Electromagnets; Exact sciences and technology; Flux; flux creep; Gd-Ba-Cu-O; High temperature superconductors; Hysteresis; Magnetic fields; Magnetic flux; Magnetic hysteresis; Magnetic materials; Magnetic shielding; Mathematical models; QMG coil magnet; Superconducting coils; Superconducting magnets; Superconductors; Various equipment and components; Critical state model; Magnetization; Magnet; Flux creep; Doping; Machining; Doped materials; Magnetic hysteresis; Numerical method; Experimental study; Axial symmetry; Field experiment; Crystalline material; QMG coil magnet; Shielding effect; High field; Gd-Ba-Cu-O; Current distribution; Numerical simulation; Bulk HTS; Magnetic field; Electric current; High temperature superconductor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2007.899955

This paper presents an evaluation of the magnetic hysteresis of a coil type QMG magnet for a high field application of oxide bulk high Tc superconductors (HTS). The QMG is a high Jc bulk material, which consists of single crystalline 123 with finely dispersed 211. The bulk coil is made from a slice of Ag doped Gd based QMG by using precise machining techniques. In the present study, magnetic field profile on the QMG coil in experiment is discussed from shielding current distribution. Magnetic field hysteresis in experiments is numerically analyzed with an axisymmetric model, where the superconductive characteristic is evaluated with a critical state model. Flux creep phenomenon in rapid magnetization with rectangular applied current is also evaluated by the numerical simulation.