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An 8-km long MgB2wire for a prototype klystron magnet was made and evaluated. The wire was made by a typical in situ method; it has 10 filaments and 0.67 mm in outer diameter. The homogeneity of Icof this wire was evaluated by several methods. Deviation of Icvalues in short sample wires was very small. In addition, the current sharing temperature of the MgB2magnet (made of two reels of wire 2.9 km long each) agreed well with the estimated value of the Ic-B-T properties in short sample wires. Based on the obtained results, it can be said that the Icproperties of the entire wire length are quite uniform.
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Tanaka et al. (2020) studied this question.
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