TY - JOUR
T1 - Analytical and experimental investigation of electrical characteristics of a metallic insulation GdBCO coil
AU - Yang, D. G.
AU - Choi, Y. H.
AU - Kim, Y. G.
AU - Song, J. B.
AU - Lee, H. G.
N1 - Funding Information:
We would like to thank Professor Yukikazu Iwasa at the Francis Bitter Magnet laboratory of MIT for valuable comments and feedback in the preparation of this manuscript. This work was supported by the Materials and Components Technology Development Program of KEIT [No. 10053590, Development of MgB2 wire and coil with high critical current and long length for superconducting medical·electric power equipment].
Publisher Copyright:
© 2016 AIP Publishing LLC.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - This paper presents results, experimental and analytical, of the electrical characteristics of GdBCO single-pancake coils co-wound with a brass tape as metallic insulation (MI coil). The GdBCO pancakes were subjected to sudden discharge, charge-discharge, and over-current tests. The sudden discharge and charge-discharge test results of the MI coil demonstrated that MI coils can be charged and discharged significantly faster than non-insulated coils that are wound only with GdBCO tape. In over-current tests at 150 A (1.25Ic), the MI coil exhibited better electrical behavior, i.e., self-protecting features, than its counterpart co-wound with Kapton tape, an insulator. Moreover, the experimental and analytical results are in agreement, validating the use of a concise equivalent parallel-RL circuit model for the MI coil to characterize its electrical behavior. Overall, the MI winding technique is highly promising to help build compact, mechanically robust, and self-protecting magnets composed of REBCO pancake coils. With no organic material in the winding, MI REBCO pancakes will be immune to neutron radiation damage, making the MI winding technique a viable option for fusion reactors, such as for toroidal field, poroidal field magnets, and central solenoid.
AB - This paper presents results, experimental and analytical, of the electrical characteristics of GdBCO single-pancake coils co-wound with a brass tape as metallic insulation (MI coil). The GdBCO pancakes were subjected to sudden discharge, charge-discharge, and over-current tests. The sudden discharge and charge-discharge test results of the MI coil demonstrated that MI coils can be charged and discharged significantly faster than non-insulated coils that are wound only with GdBCO tape. In over-current tests at 150 A (1.25Ic), the MI coil exhibited better electrical behavior, i.e., self-protecting features, than its counterpart co-wound with Kapton tape, an insulator. Moreover, the experimental and analytical results are in agreement, validating the use of a concise equivalent parallel-RL circuit model for the MI coil to characterize its electrical behavior. Overall, the MI winding technique is highly promising to help build compact, mechanically robust, and self-protecting magnets composed of REBCO pancake coils. With no organic material in the winding, MI REBCO pancakes will be immune to neutron radiation damage, making the MI winding technique a viable option for fusion reactors, such as for toroidal field, poroidal field magnets, and central solenoid.
UR - http://www.scopus.com/inward/record.url?scp=84959503877&partnerID=8YFLogxK
U2 - 10.1063/1.4942911
DO - 10.1063/1.4942911
M3 - Article
AN - SCOPUS:84959503877
SN - 0034-6748
VL - 87
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 3
M1 - 034701
ER -