In addition to the dipole and quadrupole magnets that guide and focus the charged particles, corrector magnets are used to cure imperfections in the magnets and compensate for alignment errors, Accelerating News.
Successful tests of canted correctors for HL-LHC
Successful tests of canted correctors for HL-LHC
Successful tests of canted correctors for HL-LHC
Corrector magnets