Kajikawa Kazuhiro, Gettliffe Gwendolyn V, Chu Yong, Miyagi Daisuke, Lécrevisse Thibault P, Hahn Seungyong, Bascuñán Juan, Iwasa Yukikazu
K. Kajikawa was with the Francis Bitter Magnet Laboratory of the Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA. He is now with the Research Institute of Superconductor Science and Systems, Kyushu University, Fukuoka 819-0395, Japan. G. V. Gettliffe is with the Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.Y. Chu, D. Miyagi, T. P. Lécrevisse, S. Hahn, J. Bascuñán, and Y. Iwasa are with the Francis Bitter Magnet Laboratory of the Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
IEEE Trans Appl Supercond. 2015 Jun;25(3). doi: 10.1109/tasc.2014.2363495. Epub 2014 Oct 16.
Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.
两种类型的振荡线圈旨在减少用高温超导(HTS)带绕制的螺线管线圈中感应出的屏蔽电流。一种是一对同轴位于HTS线圈内部和外部的铜质振荡线圈,用于在轴向施加交流磁场。另一种是仅位于HTS线圈外部且带有切口的HTS振荡线圈,以尽可能减小施加到HTS线圈绕组上的局部交流场的径向分量。结果发现,铜质振荡线圈在液氦中产生的功率耗散量是可允许的。使用窄宽度的市售涂层导体,在液氮中还通过实验验证了HTS振荡线圈对于减少由另一个磁化的HTS线圈产生的屏蔽电流感应场的有效性。