EFFECTS OF VIBRATION IN STORAGE-RING OF POHANG LIGHT-SOURCE

Effects of vibrations in a storage ring are described. For convenience , vibrational sources are categorized as internal and external sources depending on their locations. Internal sources are likely to cause a random vibration of magnets, and their effects on the motion of a circ ulating beam are described well by the conventional closed orbit ampli fication factor. External sources cause all or some magnets to vibrate in a coherent manner, and their effect on the beam motion requires se parate treatment. In this paper, we discuss the effects of both intern al and external vibrational sources on the motion of a stored beam in a storage ring. The results are applied to the Pohang Light Source (PL S) 2 GeV storage ring, currently under construction in Pohang, Korea. Some recent measurement results of the PLS storage ring floor vibratio n are also presented.