Performance of an HTS Persistent Current System for REBCO Pancake Coil

A superconducting joint and a persistent current switch are the key technologies in persistent current operation for MRI and NMR magnets to obtain higher resolution and sensitivity. We prepared a persistent current system including a superconducting joint, a persistent current switch, and a double p...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 28; no. 3; pp. 1 - 4
Main Authors Takahashi, Kohki, Hase, Tomoya, Awaji, Satoshi, Nakai, Akinobu, Yamano, Satoshi, Mukoyama, Shinichi, Sakamoto, Hisaki
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2018
Subjects
High-temperature superconductors
Magnetic fields
Magnetic noise
Persistent current operation
Persistent currents
REBCO tape
shielding current
Superconducting coils
superconducting joint
Superconducting magnets
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Summary:A superconducting joint and a persistent current switch are the key technologies in persistent current operation for MRI and NMR magnets to obtain higher resolution and sensitivity. We prepared a persistent current system including a superconducting joint, a persistent current switch, and a double pancake coil, which were fabricated with a REBCO tape. The magnetic field decay behavior in persistent current operation were observed in a self-field and the external magnetic field of 1 T at 20 K. In the self-field, the decay rate of persistent current excited up to 170 A reached to 1.7 ppm/h after five days operation. This means that the practical persistent current operation has been achieved successfully using the REBCO superconducting joint. From the voltage-current characteristics estimated from the magnetic field decay, it was found that the decay behavior of persistent current is dominated by the joint resistance in 1 T, but by the shielding current in the self-field.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2017.2773826