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Description
The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) stands as one of the world’s leading experimental facilities for research in rare isotope science. At FRIB, the High Rigidity Spectrometer (HRS) is a new system that combines a magnetic spectrometer with an associated analysis beamline. Designed for experiments utilizing fast beams (≳100 MeV/𝑢), the HRS accommodates magnetic rigidities of up to 8 Tm. As part of the high-transmission beamline (HTBL) within the HRS, a discrete cosine-theta superconducting quadrupole triplet has been designed. This triplet magnet has a nested coil structure that includes quadrupole and multipole corrector coils. This paper firstly analyzes the mechanical response of the magnet when nested coils operate at different polarities. Secondly, the reinforcement structure is developed to improve the structural stability of the magnet. Lastly, the fabrication process of the multipole coils and the field mapping test setup for the quadrupole magnet are presented. The field mapping test will validate the mechanical design and fabrication accuracy of the quadrupole magnet.
