A new approach to a superconducting joining process for carbon-doped MgB2 conductor

Patel D., Al Hossain M. S., Maeda M., Shahabuddin M., Yanmaz E., Pradhan S., ...More

Superconductor Science and Technology, vol.29, no.9, 2016 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 9
  • Publication Date: 2016
  • Doi Number: 10.1088/0953-2048/29/9/095001
  • Journal Name: Superconductor Science and Technology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: C-doped MgB2 wire, field-decay measurement, MRI application, persistent-mode magnets, superconducting joints
  • Istanbul Gelisim University Affiliated: Yes

Abstract

© 2016 IOP Publishing Ltd.We report a new approach to a superconducting joining process for unreacted in situ carbon (C)-doped magnesium diboride (MgB2) wires. To operate a magnetic resonance imaging (MRI) magnet in the persistent mode, the superconducting joints between two conductors are as critical as the other key components. In addition, a stable and reliable joining process enables the superconducting magnet to operate without an external power supply. However, joint results using unreacted in situ C-doped MgB2 wires, which are used for high-field operation, have been limited, and only very poor performance has been obtained. By controlling the pressure inside a joint part, in this study, we successfully obtained current carrying retention in the joint of up to 72% compared to wire without a joint. The closed-circuit resistance of our closed-loop coil was less than 1.8 × 10-13 Ω at 16.7 ± 4.7 K, as measured by the field-decay measurement method. These results indicate that MgB2 has a promising future in MRI application.