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Description
Achieving high beam stability in the 3 GeV SPS-II storage ring critically depends on the precision of its quadrupole magnets.This work presents a crucial phase of the magnet prototype development, which is central to fostering domestic high-technology manufacturing with Thai industry partners.Field measurements on the initial quadrupole design featuring removable poles revealed a critical engineering issue of significant multipole errors caused by mechanical pole rotation. This error was traced to the stresses and assembly error that occurred during pole removal and re-assembly for coil installation.To solve this specific problem, an improved quadrupole design was employed.The new symmetrical geometry eliminates the pole-removal step, thus intrinsically preventing the assembly error and significantly increasing structural stability and field quality. Coupled mechanical-magnetic analysis using ANSYS Workbench and Opera-3D confirms this approach. The simulations demonstrate that the improved design provides the required mechanical stability to minimize multipole field errors. The data presented validates this successful design change. The strict production tolerances were defined, and it is demonstrated precisely how the new design resolves the pole rotation issue. The presentation will feature a direct comparison of magnetic field measurements from both the initial and the improved prototypes, definitively verifying the enhanced performance necessary for SPS-II commissioning.
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