WB12-5

Superconducting joints using multifilament MgB₂ wires for MRI application

*Dipak Patel¹, Akiyoshi Matsumoto², Hiroaki Kumakura², Minoru Maeda³, Su-Hun Kim⁴, Hao Liang¹, Yusuke Yamauchi^5,6, Seyong Choi³, Jung Ho Kim⁷, Md Shahriar A Hossain¹

• School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland 4067, Australia¹
• National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan²
• Department of Electrical Engineering, Kangwon National University, Kangwon 25913, Republic of Korea³
• Department of Electrical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea⁴
• Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St Lucia, Queensland 4072, Australia⁵
• JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (WPI-MANA), NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan⁶
• Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia⁷

This talk will present superconducting joints using 36 filaments magnesium diboride (MgB₂) wires in continuation joint orientation and their characterisation results. One of the joints demonstrated the critical temperature of 34.4 K and the critical current (I_c) of 38.5 A at 10 K in self-field. Unconventional I_c behaviour of the joint was observed at 20 K in self-field when the I_c was measured in a high to a low field due to the effect of field trapping in the MgB₂ bulk within the joint. Elemental mapping at the interface between the MgB₂ bulk and the filament revealed oxidation, which was attributed to being responsible for reducing the I_c of the joint.

Keywords: Magnesium diboride, MgB2 superconducting joint, Multifilament MgB2 wire, MRI application