Speaker
Description
This contribution presents the modeling of the dipole magnets of the Low-Energy Ion Ring (LEIR) at CERN. The LEIR dipoles are iron-dominated C-type 90° sector magnets. Each LEIR dipole consists of 6 blocks of 1-meter-long laminated steel yoke with copper coils. The biggest challenges of the design stem from the axial air gaps and the varying angles between the blocks, causing unwanted harmonics in the magnetic field. These harmonics cause mismatches between measured and predicted linear optics parameters in LEIR. Due to the unconventional magnet design, efforts are made to obtain 3D field maps and multipole field components with high accuracy by modelling the magnet precisely in 3D. The study has started with 2D Finite Element Analysis (FEA) in different cross-sections and then continued with the 3D FEA analysis for the examination of the integrated field and the multipole components. The FEA is computed using different programs for comparison and to increase the model accuracy by fine-tuning. Finally, the model results have been compared with the beam-based optics measurements, and the efficiency of the models has been evaluated.
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