2D Magnetic Design and Optimization of a 88-mm Aperture 15 T Dipole for NED

Abstract

Abstract-The Next European Dipole (NED) activity supported by the European Union aims at the development of a high-performance Nb 3 Sn conductor ( c = 1500 A mm 2 @ 15 T, 4.2 K) in collaboration with European industry and at the design of a highfield dipole magnet making use of this conductor. In the framework of the NED collaboration which coordinates the activity of several institutes, CERN has contributed to the electromagnetic design study of a cos , layer-type superconducting dipole with an 88 mm aperture that is able to reach 15 T at 4.2 K. Part of the optimization process was dedicated to the reduction of the multipole coefficients so as to improve field quality while keeping an efficient peak-field to main-field ratio. In this paper, we present the optimization of the coil cross-section and of the shape of the iron yoke to reduce saturation-induced field errors during ramp. The effects of persistent magnetization currents are also estimated and different methods to compensate persistent-current-induced field distortions are presented.Index Terms-High field dipole magnet, iron yoke saturation, Nb 3 Sn, persistent magnetization currents.

Comparison of 2-D Magnetic Designs of Selected Coil Configurations for the Next European Dipole (NED)

“…Layered Design The conventional layered configuration has been optimized at CERN [3]. Table II reports outstanding figures of merit of the 88 mm aperture dipole with round iron yoke.…”