Development of a bunch-by-bunch longitudinal feedback system with a wide dynamic range for the HIGS facility
SCIE
SCOPUS
- Title
- Development of a bunch-by-bunch longitudinal feedback system with a wide dynamic range for the HIGS facility
- Authors
- Wu, WZ; Kim, Y; Li, JY; Teytelman, D; Busch, M; Wang, P; Swift, G; Park, IS; Ko, IS; Wu, YK
- Date Issued
- 2011-03-11
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- Electron beam coupled-bunch instabilities can limit and degrade the performance of storage ring based light sources. A longitudinal feedback system has been developed for the Duke storage ring to suppress multi-bunch beam instabilities which prevent stable, high-current operation of the storage ring based free-electron lasers (FELs) and an FEL driven Compton gamma source, the high intensity gamma-ray source (HIGS) at Duke University. In this work, we report the development of a state-of-the-art second generation longitudinal feedback system which employs a field programmable gate array (FPGA) based processor, and a broadband, high shunt-impedance kicker cavity. With two inputs and two outputs, the kicker cavity was designed with a resonant frequency of 937 MHz, a bandwidth of 97 MHz, and a shunt impedance of 1530 Omega. We also developed an S-matrix based technique to fully characterize the performance of the kicker cavity in the cold test. This longitudinal feedback system has been commissioned and optimized to stabilize high-current electron beams with a wide range of electron beam energies (250 MeV to 1.15 GeV) and a number of electron beam bunch modes, including the single-bunch mode and all possible symmetric bunch modes. This feedback system has become a critical instrument to ensure stable, high-flux operation of HIGS to produce nearly monochromatic, highly polarized Compton gamma-ray beams. (C) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Longitudinal feedback system; Coupled bunch beam instabilities; RF kicker cavity; HIGS; Storage ring FEL
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/108039
- DOI
- 10.1016/J.NIMA.2010.12.077
- ISSN
- 0168-9002
- Article Type
- Article
- Citation
- NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 632, no. 1, page. 32 - 42, 2011-03-11
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