Ion beam storage with eleceton cooler (EC) has a possibility of increasing ion beam intensity and enhancing beam quality, in order to expand attractive industrial and medical applications field of the synchrotron. It is experimentally observed that the circulation orbit of the storage beam become unstable when the spatial beam density exceeds a certain value during the beam stacking with electron cooling, especially in the vertical direction. Concept of feedback damping has proved to be effective for suppressing the beam oscillation. Digital feedback damping is recently installed at the main ring in NIRS. This paper reports the experimental result of the analog feedback damping, and design process of the digital feedback system.The Eighth International Topical Meeting on Nuclear Applications and Utilization of Accelerators (ACCAPP ’07
