Manufacturing Error Analysis of Field Quality for the HL-LHC CCT Corrector

The High Luminosity LHC (HL-LHC) project, as an upgrade of the Large Hadron Collider (LHC), is to be started in the next decade. A set of canted cosine theta (CCT) twin aperture orbit corrector magnets will be developed in China, with a field quality requirement of 10−3 in the two apertures. Cooperating with CERN, twin aperture correctors are being fabricated as prototypes before the series production. During the fabrication of the CCT coils, certain manufacturing errors including winding error, rotating error and concentricity error appeared which will affect the field quality. This study analyzed the effects on field harmonic components by these manufacturing errors, and the manufacturing process and the first test result of the prototype were introduced briefly. Suggestions from the analysis results are provided for further series production of the 2.2-m orbit correctors.