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Description
This paper presents the measurement results of the Triplet magnets assemblies for the Swiss Light Source (SLS) 2.0 upgrade. Emphasises is given to the measurement challenges related to the tuning process of those magnets guarantying the production quality. The complete renewal of the SLS storage ring (SLS 2.0) relies on the longitudinal gradient bend (LGB) function, implemented by a Triplet, that results in a critical component of its seven-bend achromatic structure. The precise tuning of the integral LGB function, with a relative uncertainty of 0.2 % from the nominal design value, sets demanding requirements in terms of measurement precision.
The Triplet assembly comprises three magnets, namely, a central dipole flanked by two combined-function magnets that integrate quadrupole and dipole components. Each magnet is constructed with NdFeB permanent magnet blocks, ensuring a compact and high-performance design. This paper provides an overview of the Triplet magnets characteristics, highlighting design choices and the meticulous assembly process required to meet the stringent beam dynamics specifications. Finite Element (FE) simulations play a pivotal role in deriving measurement requirements, authors show from there how to tailor measurements procedures for individual magnets and fully assembled Triplets according to the chosen measurement technique. The series measurement results provide valuable insights into the production quality and performance consistency. Key lessons from that process are thereafter discussed. The findings highlight the critical importance of rigorous measurement frameworks in achieving the ambitious performance goals of SLS 2.0.
