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

• Published in: Superconductor science & technology 2016-07, Vol.29 (9)
• Main Authors: Patel, Dipak, Al Hossain, Md Shahriar, Maeda, Minoru, Shahabuddin, Mohammed, Yanmaz, Ekrem, Pradhan, Subrata, Tomsic, Mike, Choi, Seyong, Kim, Jung Ho
• Format: Article
• Language: English
• Subjects: C-doped MgB; field-decay measurement; MRI application; persistent-mode magnets; superconducting joints; wire
• ISSN: 0953-2048; 1361-6668
• DOI: 10.1088/0953-2048/29/9/095001

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 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.