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3D Modelling of the MXL Sextupole Magnet

The MXL sextupole magnet at Forschungszentrum Jülich is installed in the COSY (COoler SYnchrotron) storage ring. Its primary function is to correct beam optics and preserve the polarisation of stored particle beams during high-precision experiments.

At COSY, the JEDI (Jülich Electric Dipole Moment Investigations) collaboration conducts experiments to measure the electric dipole moment (EDM) of charged particles, such as protons and deuterons. Detecting the extremely small EDM signal requires the beam polarisation to remain coherent for hundreds or even thousands of seconds. Without sextupole correction, particles following slightly different trajectories gradually lose synchronisation, leading to a rapid decay of beam polarisation. The MXL sextupole is one of the magnet families used to compensate for these effects, thereby extending the spin coherence time and enabling high-precision EDM measurements.

Based on the original 2D engineering drawings, the CATIA Centre developed a fully parameterised 3D CAD model of the MXL sextupole magnet. The model accurately reproduces the principal components of the assembly, including the magnetic yoke, water-cooled copper coils with internal cooling channels, the main support frame, and the associated mechanical fixtures. The parameterised design facilitates efficient modification, analysis, and future optimisation while preserving consistency with the original engineering documentation.

Report: .pdf 1.51Mb