Beam oscillation and long-term movement research in KEK-ATF using the digital BPM system 'Libera'

We are performing fast and high resolution beam position measurement with a digital BPM system 'Libera' manufactured by Instrumentation Technologies for the purpose of establishing submicron level beam stability needed in cutting-edge accelerators. We performed a beam test at KEK-ATF damping ring to verify performance in ultra low emittance beam position measurement, comparing its results to ones of a bench tests that was performed to verify performance of Libera in stand-alone. Furthermore we researched both beam oscillation and long-term beam movement in KEK-ATF. The results of the performance tests and the measurement of beam oscillation and long-term beam movement are reported in this paper. (author)