Publication Details

Patel, D., Hossain, M. Al., See, K., Qiu, W., Kobayashi, H., Ma, Z., Kim, S., Hong, J., Park, J., Choi, S., Maeda, M., Shahabuddin, M., Rindfleisch, M., Tomsic, M., Dou, S. Xue. & Kim, J. (2016). Evaluation of persistent-mode operation in a superconducting MgB2 coil in solid nitrogen. Superconductor Science and Technology, 29 1-6.


We report the fabrication of a magnesium diboride (MgB2) coil and evaluate its persistent-mode operation in a system cooled by a cryocooler with solid nitrogen (SN2) as a cooling medium. The main purpose of SN2 was to increase enthalpy of the cold mass. For this work, an in situ processed carbon-doped MgB2 wire was used. The coil was wound on a stainless steel former in a single layer (22 turns), with an inner diameter of 109 mm and height of 20 mm without any insulation. The two ends of the coil were then joined to make a persistent-current switch to obtain the persistent-current mode. After a heat treatment, the whole coil was installed in the SN2 chamber. During operation, the resultant total circuit resistance was estimated to be <7.4x10−14 Ω at 19.5 K±1.5 K, which meets the technical requirement for magnetic resonance imaging application.

Grant Number

ARC/FT110100170, ARC/DE130101247