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WEPSB39 |
A Compact 15 T Dipole for FCC | |
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| 15T dipoles should be used in future colliders. A design a novel option of such a W&R niobium tin dipole is described. Main features of this dipole: 1. A gradated winding consists of four shells, wound with transposed conductors of equal height, but of different widths. The number of existing bronze Nb3Sn rectangular (1 x 2 mm2) wires in the conductors (31, 23,15 and 13) allows each of them to provide a operating current of 34 kA in the maximum local field of each shell. 2. Every shell cross section looks like ellipse, semi-major axes being normal to the median plane. This shape of the shells ensures homogeneity of the magnetic field in the 50 mm aperture. The ratio of the maximum field to the total linear current density is 13% greater than in the case of a dipole with circular cross section. 3. An inner banding is used in contrast with traditional collars. 4. The whole structure is bonded by a film adhesive VK-36, which rigidly fixes every turn at the plate and assures the absence of degradation and training of the winding. 5. The external dimensions of such a compact dipole are 170 x 260 mm, which makes it possible to place a pair of dipoles in a steel yoke with a diameter of 650-700 mm with a distance between the axes of dipoles of about 200 mm. 6. The option should be less expensive than traditional ones due to utilization of the existing bronze wires and grading the conductors. The latter saves 42% of niobium-tin wires. | ||
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