Closed Orbit Measurement and Correction of the SRRC Storage Ring

The commissioning of the storage ring at Synchrotron Radiation Research Center have been successful and the residual closed orbit distortion was reduced to 0.23 and 0.13 mm rms in the horizontal and vertical plane, respectively. This paper describes the works related to the closed orbit at SRRC, ranging from the design tolerances of the magnetic field, alignment, correction scheme, orbit measurement methods to orbit correction methods. The performance of the beam position monitor system is described and the on-line orbit correction programs are discussed