TY - JOUR
T1 - Feasibility Study for Elimination of the Screening Current-Induced Fields in HTS Coil
AU - Kim, K. L.
AU - Hahn, S.
AU - Choi, Y. H.
AU - Kim, Y. G.
AU - Kang, D. H.
AU - Kazikawa, K.
AU - Lee, H. G.
N1 - Funding Information:
This work was supported by the KETEP grant from the International Collaborative R&D Program, funded by the Korean government MKE (20118520020020). This work was supported by the Mid-Career Researcher Program through an NRF grant funded by the MEST (2012-046999).
Publisher Copyright:
© 2014, Springer Science+Business Media New York.
PY - 2015/1
Y1 - 2015/1
N2 - Herein, we report a feasibility study for elimination of the screening current-induced field (SCIF) in fully insulated (INS) and no-insulation (NI) GdBCO coated conductor (CC) coils exposed to an external AC magnetic field generated by background solenoid copper coils. Prior to investigating the effects of external AC magnetic fields on SCIF in the GdBCO CC coils, the magnetic flux density (Bz) was calculated using the equivalent circuit model and compared to the Bz obtained empirically to quantify the SCIF in the INS and NI coils. The value of the SCIF in the NI coil was smaller than that in the INS coil without the use of an external AC magnetic field, due to the current paths originating from the turn-to-turn and layer-to-layer contacts, suggesting that the screening current dissipated by contact resistance during charging. When the INS and NI coils were exposed to the external AC magnetic field, the Bz of the coils increased gradually, and eventually saturating to the calculated Bz values, indicating full removal of the SCIF. In addition, the SCIF of the NI coil could be removed under subjection to a lower external AC magnetic field compared to the INS coil, due to the lower SCIF occurring in the NI coil after charging.
AB - Herein, we report a feasibility study for elimination of the screening current-induced field (SCIF) in fully insulated (INS) and no-insulation (NI) GdBCO coated conductor (CC) coils exposed to an external AC magnetic field generated by background solenoid copper coils. Prior to investigating the effects of external AC magnetic fields on SCIF in the GdBCO CC coils, the magnetic flux density (Bz) was calculated using the equivalent circuit model and compared to the Bz obtained empirically to quantify the SCIF in the INS and NI coils. The value of the SCIF in the NI coil was smaller than that in the INS coil without the use of an external AC magnetic field, due to the current paths originating from the turn-to-turn and layer-to-layer contacts, suggesting that the screening current dissipated by contact resistance during charging. When the INS and NI coils were exposed to the external AC magnetic field, the Bz of the coils increased gradually, and eventually saturating to the calculated Bz values, indicating full removal of the SCIF. In addition, the SCIF of the NI coil could be removed under subjection to a lower external AC magnetic field compared to the INS coil, due to the lower SCIF occurring in the NI coil after charging.
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U2 - 10.1007/s10948-014-2790-y
DO - 10.1007/s10948-014-2790-y
M3 - Article
AN - SCOPUS:84925541962
VL - 28
SP - 83
EP - 88
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 1
ER -