Optimization of the high order correctors for HL-LHC toward the series production

INFN is developing at the LASA lab (Milano, Italy) the High Or-der corrector magnets for the High Luminosity-LHC (HL-LHC) project, which will equip the interaction regions. Five prototypes, from skew quadrupole to dodecapole, have been designed and tested at LASA. All the HO correctors are based on a superferric design, which allows a relatively simple, modular, and easy to construct magnet. This modularity has been exploited for an en-gineering change request. The tradeoff between safe handling, force management during cooldown, powering and protection of the magnet is explained in detail. The design of the coils and the mechanical assembly have been improved to increase the efficien-cy of the series production. Most of the optimizations are aimed to guarantee both a good integration in the LHC framework, i.e. ra-diation hardness, easiness of installation, safe operation over years, and compatibility with the series production, i.e. standard-ization of procedures and components for different magnets, re-duction of the number of components, standardization of the quality control systems and acceptance tests. All the produced magnets will be tested at LASA and then delivered to CERN, the design of the test-bed and the optimization of cryogenic and test-ing procedures is also described in this paper. After the prototyp-ing phase, we report in detail the solutions chosen for the HO cor-rectors and we give a perspective of the series construction in in-dustry and acceptance tests at LASA.