Development of an indirectly cooled superconductor for the LHD fusion reactor FFHR

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Abstract

A 100-kA indirectly cooled superconductor has been designed and optimized for the heliotron fusion power reactor FFHR. A doubly transposed Rutherford cable composed of 216 Nb3Sn superconducting wires is embedded in an aluminum-alloy jacket with a high filling factor. Additional high purity aluminum strips around the cable reduce the hotspot temperature to 150 K. The final design has a rectangular cross section that is 100mm wide and 25mm high, which will achieve an operating current of 100 kA at a current density of 40A/mm2. A prototype of the conductor was developed to demonstrate the fabrication process. The prototype has the same configuration as the design, except that the aluminum strips are eliminated.

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Takahata, K., Tamura, H., Mito, T., Imagawa, S., & Sagara, A. (2014). Development of an indirectly cooled superconductor for the LHD fusion reactor FFHR. Plasma and Fusion Research, 9(SpecialIssue2). https://doi.org/10.1585/pfr.9.3405034

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