Simulation study of new orbit correction method with the Super-SOR and ALS rings

A new orbit correction method, called the eigenvector method with constraints (EVC), is proposed and formulated to unite global and local orbit corrections for synchrotron radiation (SR) sources. The EVC can exactly correct the beam positions at arbitrarily selected ring positions such as light source points, simultaneously reducing closed orbit distortion (COD) around the whole ring. Computer simulations clearly demonstrate these features of the EVC for both cases of the Super-SOR light source and the ALS (Advanced Light Source) that have typical structures of high-brilliance SR sources. Simulation results show that the EVC is very effective and useful for orbit correction and beam position stabilization in SR sources. (author)