Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 32, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2021.3132553
Keywords
Superconducting magnets; Magnetic resonance imaging; Magnetic field measurement; Magnetic flux; Insulated gate bipolar transistors; High-temperature superconductors; Voltage measurement; High-temperature superconductivity; bulk superconductors; bulk superconducting rings; trapped field magnets; pulsed field magnetization; waveform control
Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P020313/1, EP/T014679/1]
- EPSRC [EP/T014679/1, EP/P020313/1] Funding Source: UKRI
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The potential application of ring-shaped, single grain RE-Ba-Cu-O bulk superconductors in MRI and NMR systems as an alternative to conventional permanent magnets could be significantly improved by optimizing the waveform of the magnetizing pulse used in the pulsed field magnetization (PFM) method.
One of the potential applications of ring-shaped, single grain RE-Ba-Cu-O bulk superconductors is in desktop magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) systems as an alternative to conventional permanent magnets. The higher magnetic field available from magnetized bulk superconductors could significantly improve the performance of such systems, as well as reduce their size and increase portability. The pulsed field magnetization (PFM) method provides a fast, compact and cost-effective method for magnetizing these materials as trapped field magnets. However, bulk superconducting rings are very susceptible to thermomagnetic instabilities during the PFM process, and thus, to date, the reported trapped fields in ring bulks magnetized by PFM are less than 0.35 T at the centre of single rings. In this work, we demonstrate that the trapped field in a superconducting ring bulk can be enhanced significantly by optimizing the waveform of the magnetizing pulse used in the PFM method. This optimization can be achieved easily by using an Insulated Gate Bipolar Transistor as a fast-switching device with a controllable switching frequency in the pulse-generating electric circuit. Our findings represent a key step forward in utilizing bulk, single-grain superconducting rings magnetized by PFM in portable magnet systems.
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