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Bunch-by-bunch position measurement and analysis at PLS-II
Jaeyu Lee1, M H Chun1, G J Kim1
1Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea.
Abstract:
A bunch-by-bunch measurement system has been developed at Pohang Light Source II. The system consists of a four-channel button pick-up, 20 GHz sampling oscilloscope and an 800 MHz low-pass digital filter. Upon measuring a bunch-by-bunch spatio-temporal beam motion matrix over many turns, singular-value decomposition analysis is used to reveal the dominant coupled-bunch modes. The system can diagnose injection oscillations due to kicker errors and the effect of resistive-wall impedance that gives rise to instability during operation.
