Experimental Results of the Design for the APS PID
Global Orbit Control System

Jeffrey A. Kirchman, Youngsoo Chung
Argonne National Laboratory

James P. Bobis
Northern Illinois University

The Advanced Photon Source third generation synchrotron light source needs a stabilized particle beam position to produce high brightness and low emittance of the beam. Global orbit correction control is introduced which is utilized to achieve the demanding needs of the accelerator. This paper presents the experimental results for determining an effective and optimal controller to meet the global orbit correction's requirements. These requirements include frequency/time domain demands consisting of vibrational noise attenuation, limiting of controller gains for stability, and improving the system time response. Experiments were conducted with a digital signal processor implementing various PID sets to make comparisons between simulations and experiments. Measurements at these PID sets supported the assertions made by the software simulations.