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Title: Top-up operation at Pohang Light Source-II

Abstract

After three years of upgrading work, PLS-II (S. Shin, Commissioning of the PLS-II, JINST, January 2013) is now successfully operating. The top-up operation of the 3 GeV linear accelerator had to be delayed because of some challenges encountered, and PLS-II was run in decay mode at the beginning in March 2012. The main difficulties encountered in the top-up operation of PLS-II are different levels between the linear accelerator and the storage ring, the 14 narrow gap in-vacuum undulators in operation, and the full energy injection by 3 GeV linear accelerator. Large vertical emittance and energy jitter of the linac were the major obstacles that called for careful control of injected beam to reduce beam loss in the storage ring during injection. The following measures were taken to resolve these problems: (1) The high resolution Libera BPM (see http://www.i-tech.si ) was implemented to measure the beam trajectory and energy. (2) Three slit systems were installed to filter the beam edge. (3) De-Qing circuit was applied to the modulator system to improve the energy stability of injected beam. As a result, the radiation by beam loss during injection is reduced drastically, and the top-up mode has been successfully operating since 19th Marchmore » 2013. In this paper, we describe the experimental results of the PLS-II top-up operation and the improvement plan.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2]
  1. Pohang Accelerator Laboratory, Pohang, Kyungbuk 790-834 (Korea, Republic of)
  2. Department of Physics, POSTECH, Pohang, Kyungbuk 790-834 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22308860
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; GEV RANGE; LINEAR ACCELERATORS; POHANG LIGHT SOURCE; RESOLUTION; STORAGE RINGS; WIGGLER MAGNETS

Citation Formats

Hwang, I., Huang, J. Y., Kim, M., Lee, B. -J., Kim, C., Choi, J. -Y., Kim, M. -H., Lee, H. S., Moon, D., Lee, E. H., Kim, D. -E., Nam, S. H., Shin, S., and Cho, Moohyun. Top-up operation at Pohang Light Source-II. United States: N. p., 2014. Web. doi:10.1063/1.4878256.
Hwang, I., Huang, J. Y., Kim, M., Lee, B. -J., Kim, C., Choi, J. -Y., Kim, M. -H., Lee, H. S., Moon, D., Lee, E. H., Kim, D. -E., Nam, S. H., Shin, S., & Cho, Moohyun. Top-up operation at Pohang Light Source-II. United States. https://doi.org/10.1063/1.4878256
Hwang, I., Huang, J. Y., Kim, M., Lee, B. -J., Kim, C., Choi, J. -Y., Kim, M. -H., Lee, H. S., Moon, D., Lee, E. H., Kim, D. -E., Nam, S. H., Shin, S., and Cho, Moohyun. 2014. "Top-up operation at Pohang Light Source-II". United States. https://doi.org/10.1063/1.4878256.
@article{osti_22308860,
title = {Top-up operation at Pohang Light Source-II},
author = {Hwang, I. and Huang, J. Y. and Kim, M. and Lee, B. -J. and Kim, C. and Choi, J. -Y. and Kim, M. -H. and Lee, H. S. and Moon, D. and Lee, E. H. and Kim, D. -E. and Nam, S. H. and Shin, S. and Cho, Moohyun},
abstractNote = {After three years of upgrading work, PLS-II (S. Shin, Commissioning of the PLS-II, JINST, January 2013) is now successfully operating. The top-up operation of the 3 GeV linear accelerator had to be delayed because of some challenges encountered, and PLS-II was run in decay mode at the beginning in March 2012. The main difficulties encountered in the top-up operation of PLS-II are different levels between the linear accelerator and the storage ring, the 14 narrow gap in-vacuum undulators in operation, and the full energy injection by 3 GeV linear accelerator. Large vertical emittance and energy jitter of the linac were the major obstacles that called for careful control of injected beam to reduce beam loss in the storage ring during injection. The following measures were taken to resolve these problems: (1) The high resolution Libera BPM (see http://www.i-tech.si ) was implemented to measure the beam trajectory and energy. (2) Three slit systems were installed to filter the beam edge. (3) De-Qing circuit was applied to the modulator system to improve the energy stability of injected beam. As a result, the radiation by beam loss during injection is reduced drastically, and the top-up mode has been successfully operating since 19th March 2013. In this paper, we describe the experimental results of the PLS-II top-up operation and the improvement plan.},
doi = {10.1063/1.4878256},
url = {https://www.osti.gov/biblio/22308860}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 85,
place = {United States},
year = {Thu May 15 00:00:00 EDT 2014},
month = {Thu May 15 00:00:00 EDT 2014}
}