Enhancement of charging and discharging rates for partially insulated MgB2 magnets composed of Cr-coated MgB2 superconducting wires

• Published in: Results in physics 2019-12, Vol.15, p.102754, Article 102754
• Main Authors: Kim, Y.G., Kim, J.M., Kim, K.H., Noh, H.S., Kim, H.S., Hwang, D.Y., Lee, H.G.
• Format: Article
• Language: English
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2019.102754

•The use of Cr-coated MgB2 wires enhanced charging/discharging rates by 10 times.•The time constant of magnet using Cr-coated MgB2 wires was reduced by 10 times.•The self-protection can also be achieved in PI magnet using Cr-coated MgB2 wires. In this paper, we propose the use of Cr-coated MgB2 wires to enhance the charging/discharging rates of the MgB2 magnet fabricated with a partial insulation (PI) winding technique that can provide a self-protecting feature to the magnet. The charging/discharging rates of the PI magnets with the Cr-coated MgB2 wires was approximately 10 times faster than that the magnets with un-coated wires. In addition, the self-protective behavior of the PI magnet with the Cr-coated wires was verified via over-current analysis. From the test results, the effectiveness of the proposed winding technique was verified for the development of self-protective MgB2 magnetic resonance imaging (MRI) magnets with rapid charging/discharging rates.