A feasibility has been demonstrated for numerical reconstruction of geometrical displacement or deformations of the winding occurred in the manufacture and assembly of magnet coils using magnetic measurements, that is one of the principal issues for the quality control of the magnet. For validations of the proposed approach, test results of reconstruction of possible misalignments and deviations of the ITER coil are presented.The method described is applicable for a variety of coils.
The work has been carried out at the Efremov Institute according to the new PETRA-III machine optics. Normal-conducting magnets (quadrupole, dipole and corrector magnets) for the PETRA-III project were designed and calculated. Prototypes were built and magnetic measurements were carried out.Two precision quadrupole magnets with asymmetrical yoke lengths were developed. Their apertures are 70 mm and their design gradients 21.5 T/m. The integral field nonlinearity in the good field region (GFR), r o 25 mm should be less than 0.0005. The new dipole magnets for the PETRA-III project have a H-shaped magnetic yoke with a length of 1 m. In the GFR area of 60 mm 36 mm a magnetic field of B max = 1 T should be obtained. Within the GFR limits the integral field nonlinearity should be less than 0.0005, which is achieved by profiling the poles (longitudinal chamfers, slants and shims). The vertical correction dipole magnet has a horizontal magnetic field of B x = 0 062 T, its aperture is 112 mm 50 mm and its total length, including the coil end parts, is limited to L = 200 mm. The authors have designed two versions one with aircooling and one with water-cooling. Results of the magnetic measurements are given and compared with the simulation.
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