Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 29, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/29/4/04LT02
Keywords
persistent-mode operation; MgB2; superconducting joint; solid nitrogen; MRI
Categories
Funding
- Australian Research Council [FT110100170, DE130101247]
- University of Wollongong and Australian Institute for Innovative Material internal grant
- Korea Basic Science Institute [C36222]
- JSPS KAKENHI [26709021]
- Deanship of Scientific Research at King Saud University [RGP-VPP-290]
- Hyper Tech Research Inc., USA
- Australian Research Council [FT110100170] Funding Source: Australian Research Council
- Grants-in-Aid for Scientific Research [26709021] Funding Source: KAKEN
- National Research Council of Science & Technology (NST), Republic of Korea [C36220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 < 7.4 x 10(-14) Omega at 19.5 K +/- 1.5 K, which meets the technical requirement for magnetic resonance imaging application.
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