Lee J, Chun MH, Kim GJ, Shin DC, Kim DT, Shin S. Bunch-by-bunch position measurement and analysis at PLS-II.
J Synchrotron Radiat 2017;
24:163-167. [PMID:
28009555 DOI:
10.1107/s1600577516018154]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 11/11/2016] [Indexed: 06/06/2023]
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.
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