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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 1: Particle and Photon Sources

AKBP 1.6: Talk

Monday, March 20, 2023, 17:15–17:30, CHE/0183

Computational homogenisation of laminated yokes in finite-element models of fast-ramped orbit corrector magnets — Jan-Magnus Christmann¹, Moritz von Tresckow¹, •Herbert De Gersem¹, Alexander Aloev², Sajjad H. Mirza², Sven Pfeiffer², and Holger Schlarb² — ¹TEMF, TU Darmstadt, Germany — ²DESY, Hamburg, Germany

Fast corrector magnets need to be equipped with iron yokes to keep their inductance sufficiently low. Even iron stacks with thin laminates suffer from relevant eddy-current losses at elevated frequencies, causing Joule losses and invoking a time delay between excitation current and aperture field. Resolving the individual laminates within a finite-element model is not feasible. Instead, computational homogenisation is applied. The lamination stack is modelled as a bulk part and represented by an anisotropic and frequency-dependent surrogate material. This contribution illustrates the validity of this approach. The correction magnets planned for the fast orbit feedback system of PETRA IV at DESY serve as an example.