Аннотация:An 8-km long MgB 2 wire 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 I c of this wire was evaluated by several methods. Deviation of I c values in short sample wires was very small. In addition, the current sharing temperature of the MgB 2 magnet (made of two reels of wire 2.9 km long each) agreed well with the estimated value of the I c -B-T properties in short sample wires. Based on the obtained results, it can be said that the I c properties of the entire wire length are quite uniform.
