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Top-up operation at Pohang Light Source-II.

I Hwang1, J Y Huang1, M Kim1

  • 1Pohang Accelerator Laboratory, Pohang, Kyungbuk 790-834, South Korea.

The Review of Scientific Instruments
|June 2, 2014
PubMed
Summary
This summary is machine-generated.

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The Pohang Light Source II (PLS-II) successfully achieved top-up operation after overcoming challenges with beam injection. Advanced diagnostics and control systems significantly reduced beam loss, enabling stable operation of this synchrotron light source.

Area of Science:

  • Accelerator physics
  • Synchrotron radiation technology
  • Particle beam manipulation

Background:

  • The Pohang Light Source II (PLS-II) underwent a three-year upgrade and commenced operation in March 2012.
  • Initial operation was in decay mode due to challenges with top-up mode implementation.

Purpose of the Study:

  • To detail the experimental results and improvements for achieving stable top-up operation at PLS-II.
  • To address and resolve difficulties encountered during the top-up injection process.

Main Methods:

  • Implementation of high-resolution beam position monitors (BPM) for trajectory and energy measurement.
  • Installation of slit systems for beam edge filtering.
  • Application of a De-Qing circuit to the modulator system for enhanced energy stability.

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Main Results:

  • Difficulties including level differences, narrow gap undulators, and full energy injection were addressed.
  • Large vertical emittance and energy jitter from the linear accelerator were managed.
  • Beam loss during injection was drastically reduced, enabling successful top-up mode operation since March 19, 2013.

Conclusions:

  • The implemented measures effectively resolved injection challenges at PLS-II.
  • Successful transition to and sustained top-up operation of PLS-II has been achieved.
  • The findings provide valuable insights for future synchrotron light source operations.