Effects of construction and alignment errors on the orbit functions of the Advanced Photon Source Storage Ring

The orbit functions for the Advanced Photon Source storage ring have been studied using the simulation code RACETRACK. Nonlinear elements are substituted into the storage ring lattice to simulate the effects of construction and alignment errors in the quadrupole, dipole, and sextupole magnets. The effects of these errors on the orbit distortion, dispersion, and beta functions are then graphically analyzed to show the RMS spread of the functions across several machines. The studies show that the most significant error is displacement of the quadrupole magnets. Further studies using a three-bump correction routine show that these errors can be corrected to acceptable levels.<
>