Field Quality of the Series of Short Orbit Nested Corrector Magnets for HL-LHC

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Abstract
MCBXF magnets are orbit correctors for the High-Luminosity (HL) Large Hadron Collider (LHC) upgrade. The magnet design consists of two nested dipoles, with an aperture of 150 mm, which is described elsewhere. The magnets have been designed in two physical lengths, namely of 2.5 m (MCBXFA) and 1.5 m (MCBXFB), with the same cross section. The series production of the magnets consists of 5 long and 10 short magnets. The component production is being carried out at CIEMAT and magnet assembly is made at CERN. This paper summarizes the results of the magnetic measurements of the short magnets produced so far, including warm magnetic measurements. The first magnets featured repetitive results regarding field quality. Afterwards, some of the magnets showed a shift of the main harmonics. After careful analysis of the fabrication steps, it was found out that the impregnation mold assembly strategy impacted on the coil dimensions. The shimming plan was tuned to deal with this feature, and the field quality was enhanced accordingly.
Funding Information
  • Spanish Center for Technological and Industrial Development
  • Spanish Ministry of Science and Innovation through PRISMAC Program
  • CERN (KE-3797)

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