TY - JOUR
T1 - Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors
AU - Miyazaki, Hiroshi
AU - Iwai, Sadanori
AU - Uto, Tatsuro
AU - Otani, Yasumi
AU - Takahashi, Masahiko
AU - Tosaka, Taizo
AU - Tasaki, Kenji
AU - Nomura, Shunji
AU - Kurusu, Tsutomu
AU - Ueda, Hiroshi
AU - Noguchi, So
AU - Ishiyama, Atsushi
AU - Urayama, Shin Ichi
AU - Fukuyama, Hidenao
N1 - Funding Information:
This work was supported by the Ministry of Economy, Trade and Industry and the Japan Agency for Medical Research and Development.
Publisher Copyright:
© 2017 IEEE.
PY - 2017/6
Y1 - 2017/6
N2 - Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.
AB - Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.
KW - REBCO-coated conductor
KW - Screening-current-induced magnetic field
KW - conduction-cooled
UR - http://www.scopus.com/inward/record.url?scp=85015056916&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85015056916&partnerID=8YFLogxK
U2 - 10.1109/TASC.2017.2657636
DO - 10.1109/TASC.2017.2657636
M3 - Article
AN - SCOPUS:85015056916
SN - 1051-8223
VL - 27
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 4
M1 - 7835760
ER -