Persistent Current Mode of a 1-T-Class HTS Pancake Coil for NMR/MRI Applications

Author

Woo-Seok Kim ; Seyeon Lee ; Yungil Kim ; Ji Young Lee ; Sang-Ho Park ; Ji-Kwang Lee ; Gye-Won Hong ; Jinho Han ; Kyeongdal Choi

Author_Institution

Korea Polytech. Univ., Siheung, South Korea

Volume

25

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1

Lastpage

4

Abstract

We had proposed a winding method, the so-called “wind-and-flip,” which enables a persistent current-mode operation of a high-temperature superconducting (HTS) pancake coil. Two pancake coils had been fabricated using this method and tested in a liquid nitrogen bath with an external magnetic field. The result showed that the time stability was not good enough to use for magnetic resonance imaging or nuclear magnetic resonance when they were magnetized by field cooling at 77 K. In this paper, the test results of a stacked HTS pancake coil for a center magnetic field of 1 T are presented. The coils were cooled to 20 K by conduction cooling using a Gifford-McMahon cryocooler. We measured the time stability of the persistent current-mode operation at 20 K, which shows a strong possibility of a high-field HTS magnet using this method.

Keywords

NMR imaging; magnetic fields; persistent currents; superconducting coils; superconducting magnets; Gifford-McMahon cryocooler; HTS pancake coil; MRI application; NMR; class HTS pancake coil; conduction cooling; high-temperature superconducting pancake coil; magnetic field; magnetic resonance imaging; nuclear magnetic resonance; persistent current mode; time stability; wind-and-flip method; Coils; High-temperature superconductors; Magnetic field measurement; Magnetic fields; Magnetic flux density; Superconducting magnets; HTS magnets; magnetic field drift; persistent current; wind-and-flip;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2014.2376593

Filename

6971134