Abstract
Abstract The Pohang Light Source (PLS) storage ring uses a longitudinal feedback system (LFS) that is a bunch-by-bunch feedback system employing the digital electronics and the DSP filter algorithm to cure the longitudinal coupled bunch instabilities due to higher order modes of RF cavities. The LFS is able to suppress all longitudinal instabilities in stored beam below 320 mA at 2 GeV. Above 320 mA, however, transverse instabilities appeared and the LFS ceased to control longitudinal instabilities. The performance of the LFS is very reliable and repeatable. This paper describes on the PLS LFS test results of suppressing the longitudinal instabilities.
Published Version
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