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Controllability of the Contact Resistance of 2G HTS Coil With Metal Insulation
Sohn, Myung-Hwan,Sim, Kideok,Eom, Beomyong,Ha, Hong-Soo,Kim, Ho-Yong,Seong, Kichul Institute of Electrical and Electronics Engineers 2018 IEEE transactions on applied superconductivity Vol.28 No.3
<P>The turn-to-turn contact resistance of second-gene-ration (2G) HTS coil with metal insulation is a very important parameter in the viewpoint of the stability and current charging speed of the HTS coil. Controllability of the contact surface resistance of the 2G HTS coil with advanced metal insulation was observed in contrast with the case of the stainless steel (SS) metal insulation (MI). Three types of model coils—a no insulation coil, a metal insulation coil cowound with SS tape, and an MI coil cowound with copper (Cu) electroplated SS tape—were prepared and evaluated. The contact surface resistances between two Cu-plated 2G HTS tapes, between a Cu-plated 2G HTS tape and an SS tape, and between a Cu-plated 2G HTS tape and a Cu-plated SS tape are 6.3, 362.4, and 7.9 <I>μ</I> Ω·cm<SUP>2</SUP>, respectively. Dramatic reduction of the turn-to-turn contact surface resistance in model coils was achieved by using MI coil cowound with the Cu-plated SS tape. Also, the possibility of changing such contact surface resistance will be useful for designing the MI magnet.</P>
Stability of 2G HTS Double Pancake Coil With Metal Insulation and Two Parallel Resistors
Myung-Hwan Sohn,Kideok Sim,Haejong Kim,Beomyong Eom,Kichul Seong,Jeonwook Cho Institute of Electrical and Electronics Engineers 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>The enhanced stability of 2G HTS double pancake (DP) coil with metal insulation and parallel resistor was observed in contrast with the case of only metal insulation. Here, we used stainless steel tape and additional indium metal sheet as metal insulator and parallel resistor. The total length of the DP coil was 66 m and the critical current (I<SUB>c</SUB>) of the DP coil was about 78.1 A in liquid nitrogen in the criterion of 0.1 μV/cm. Minimum quench energies (MQEs) were 3.154 J at 60 A of the coil current in liquid nitrogen. MQE was 1.295 J at 60 A of the coil current and 77 K in conduction cool. New DP coil was fabricated by using the indium sheet resistor. MQE was 10.935 J in liquid nitrogen and 1.306 J in conduction cool. In this case, 2G DP MI coil attached with parallel resistors was robust under the condition of the quench induced by the heater.</P>