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Top-up operation at Pohang Light Source-II.
The Review of Scientific Instruments
|June 2, 2014
Summary
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.
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.