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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
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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.

Keywords:
bunch by bunchinstabilityposition

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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.