Optimization of a Stern–Gerlach Magnet by Magnetic Field–Circuit Coupling and Isogeometric Analysis


Stern–Gerlach magnets are used to magnetically separate a beam of atoms or atom clusters. The design is difficult, since each the magnetic field gradient and its homogeneity ought to be maximized. This paper proposes the numerical optimization of the device’s pole-shoe shapes, starting from a reference geometry given within the literature. The main contributions of this paper are the generalization of a magnetic field–magnetic circuit coupling and the application of isogeometric analysis (IGA), which are shown to reduce the computational complexity and increase the accuracy. The sphere–circuit coupling significantly reduces the size of the field model part, in that the IGA’s spline-based framework allows a highly correct evaluation of local field quantities, even across elements.

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