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Designs and Tests of Shaking Coils to Reduce Screening Currents Induced in HTS Insert Coils for NMR Magnet
Kazuhiro Kajikawa1, Gwendolyn V Gettliffe1, Yong Chu1
1K. 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.
Abstract:
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.
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