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Electromagnetic Design of the Coil-Ends for the FAIR SIS300 Model Dipole

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8 Author(s)
Sorbi, M. ; Phys. Dept., Milan Univ., Segrate, Italy ; Alessandria, F. ; Bellomo, G. ; Fabbricatore, P.
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Design activities, conductor R&D and model coil construction are under way for developing a curved fast cycled superconducting dipole for the SIS300 synchrotron at FAIR. The main target is the construction within year 2009 of a half-length model magnet (cold mass fully integrated in a horizontal cryostat). This magnet is designed for a maximum central field of 4.5 T in a bore of 100 mm, with a ramp rate of 1 T/s. The magnetic length of the prototype is 3.8 m with a curvature radius of 66.67 m (27 mm of sagitta). This paper describes the electromagnetic design of the coil-ends of the magnet. Particular emphasis is given to the study of the losses due to the eddy currents in collar and yoke, and to the other losses during the cycling of the magnet. The study has been performed with finite element codes, and it allowed to optimize the configuration in order to minimize both the peak field on the conductor and the total losses.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )