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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.
Journal of Synchrotron Radiation
|December 24, 2016
Summary
A new bunch-by-bunch measurement system diagnoses particle beam instabilities at Pohang Light Source II. It identifies coupled-bunch modes and injection oscillations, improving accelerator operations.
Area of Science:
- Accelerator physics
- Particle beam diagnostics
Background:
- Particle accelerators require precise beam control.
- Understanding beam dynamics is crucial for stable operation.
Purpose of the Study:
- To develop a novel bunch-by-bunch measurement system.
- To diagnose beam instabilities and operational issues in accelerators.
Main Methods:
- Utilized a four-channel button pick-up and a 20 GHz sampling oscilloscope.
- Implemented an 800 MHz low-pass digital filter for signal processing.
- Applied singular-value decomposition analysis to spatio-temporal beam motion data.
Main Results:
- Successfully measured bunch-by-bunch spatio-temporal beam motion over multiple turns.
- Identified dominant coupled-bunch modes using singular-value decomposition.
- Diagnosed injection oscillations and resistive-wall impedance effects.
Conclusions:
- The developed system effectively diagnoses beam instabilities.
- It provides valuable insights for optimizing accelerator performance and reliability.
