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Transverse bunch-by-bunch feedback system for time-resolved experiments at PLS-II.

Jaeyu Lee1, T Nakamura2, K Kobayashi2

  • 1Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea.

Journal of Synchrotron Radiation
|September 3, 2021
PubMed
Summary
This summary is machine-generated.

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The upgraded bunch-by-bunch feedback system at Pohang Light Source II (PLS-II) enhances single-bunch current for time-resolved experiments. This precision upgrade enables higher beam currents in hybrid fill patterns.

Area of Science:

  • Accelerator Physics
  • Synchrotron Radiation Technology

Background:

  • The Pohang Light Source II (PLS-II) facility requires an advanced bunch-by-bunch feedback system for time-resolved experiments.
  • Previous systems limited the achievable single-bunch current in hybrid fill patterns.

Purpose of the Study:

  • To describe the upgraded bunch-by-bunch feedback system at PLS-II.
  • To enhance the single-bunch current capability for time-resolved experiments.
  • To improve feedback control precision and flexibility.

Main Methods:

  • Implemented a single 500 MHz analog-to-digital converter (ADC) replacing four 125 MHz interleaved ADCs.
  • Replaced a single 2D feedback loop with two independent 1D feedback loops.
  • Integrated tune measurement and single-bunch/stretcher control functionalities.
Keywords:
PLS-IIbunch-by-bunch feedbackhigh currentshybrid mode

Related Experiment Videos

Main Results:

  • Successfully achieved a 400 mA hybrid fill pattern.
  • Demonstrated the capability to include a 10 mA single bunch within the hybrid pattern.
  • Validated the precision and effectiveness of the upgraded feedback system.

Conclusions:

  • The upgraded bunch-by-bunch feedback system significantly enhances PLS-II's capability for time-resolved experiments.
  • The system's precision allows for higher single-bunch currents and more flexible operational modes.
  • This upgrade, a result of SPring-8 and PLS-II collaboration, advances synchrotron light source technology.