Division of accelerators, cryogenics and magnetism

After the discovery of the Higgs boson at the LHC, particle physics community is exploring and proposing next accelerators, to address the remaining open questions on the underlying mechanisms and on the constituents of the present universe. One of the studied possibilities is FCC (Future Circular Collider), a 100-km-long collider at CERN. The feasibility study of this future proposed accelerator implies the definition of tolerances on magnets imperfections and corrections strategies in order to guarantee the target performances. The efficiency of the correction scheme, used to control the orbit, directly bounds the corrector needs and magnet tolerances. A first specification of the average rms value of the linear correctors’ strengths and of the tolerances for magnets misalignments and for the field quality along the entire ring can be evaluated analytically. The distribution of the correctors along the ring is simulated in python interfaced with MadX, in order to verify the quality of the residual orbit after the proposed correction strategy and compared with the analytical predictions. First specifications of the orbit correctors strength and tolerances for the alignment of the main elements of the ring are presented. The limits of the studied correction scheme and method are also discussed.