AC Loss Evaluation of a 10T Class Small REBCO Coil With Conduction-Cooled Configuration
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Abstract:
In order to use a coil wound with REBCO-coated conductor in a conduction cooling configuration, ac loss of the coil should be quantitatively predicted and designed under the operating conditions, for example during charging-up and -down, or shutdown operation. A tape-shaped REBCO-coated conductor is suited to be composed of a stack of single pancake coils for generating high magnetic field. Various researchers have measured and evaluated the ac loss of REBCO tape; however, there are few reports about the ac loss of the coil as measured at liquid nitrogen temperature. In this report, the ac loss of REBCO coil composed of a stack of 22 single pancakes with 50 mm in inner diameter, 132 mm in outer diameter, and 105 mm in height, generating 13.5T at 10 K, was measured by electrical method and evaluated with conduction cooling configuration. The experimental results were compared with the calculated results and discussed.Keywords:
Liquid nitrogen
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A multi-laminated HTS tape conductor has been recently developed to fabricate large pancake coils such as SMES. If the HTS tapes are simply laminated to form the conductor, the current distribution in the laminated tape conductor of the coil is unbalanced because of different inductances of all tapes. The pancake coil has been widely used for large magnet, because the pancake coil is tightly wound and endures large electromagnetic force. The tape transpositions at both ends of the pancake coil are effective for the coil fabrication, because it cannot damage the conductor. It is very important to analyze current distribution in the multi-laminated tape conductor used for the pancake coil. In this paper, we analyze the current distribution in the tape conductor by using circuit model, and then propose a relationship between the laminated tape number of the conductor and the pancake coil number to obtain the homogeneous current distribution. We fabricated the double pancake coil based on the relation, tested it to verify the relation and demonstrated the homogeneous current distribution in the conductor.
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