Author: Li, Z.P.
Paper Title Page
MOA1I3 Intense Beam Issues in CSNS Accelerator Beam Commissioning 16
 
  • L. Huang, H.Y. Liu, X.H. Lu, X.B. Luo, J. Peng, L. Rao
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • Y.W. An, J. Chen, M.Y. Huang, Y. Li, Z.P. Li, S. Wang
    IHEP, Beijing, People’s Republic of China
  • S.Y. Xu
    DNSC, Dongguan, People’s Republic of China
 
  The China Spallation Neutron Source (CSNS) consists of an 80 MeV H⁻ Linac, a 1.6 GeV Rapid Cycling Synchrotron (RCS), beam transport lines, a target station, and three spectrometers. The CSNS design beam power is 100 kW, with the capability to upgrade to 500 kW. In August 2018, CSNS was officially opened to domestic and international users. By February 2020, the beam power had reached 100 kW, and through improvements such as adding harmonic cavities, the beam power was increased to 140 kW. During the beam commissioning process, the beam loss caused by space charge effects was the most significant factor limiting the increase in beam power. Additionally, unexpected collective effects were observed, including coherent oscillations of the bunches, after the beam power reached 50 kW. Through a series of measures, the space charge effects and collective instabilities causing beam loss were effectively controlled. This paper mainly introduces the strong beam effects discovered during the beam commissioning at CSNS and their suppression methods. It also briefly discusses the research on beam space charge effects and collective effects in the beam dynamics design of CSNS-II project.  
slides icon Slides MOA1I3 [8.597 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-MOA1I3  
About • Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 24 October 2023
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WEA4C1 Beam Loss Studies in the CSNS Linac 297
 
  • J. Peng, X.Y. Feng, Y. Han, H.C. Liu, X.B. Luo
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • S. Fu, M.Y. Huang, Y. Li, Z.P. Li, X. Liu, S. Wang, Y. Yuan
    IHEP, Beijing, People’s Republic of China
  • S.Y. Xu
    DNSC, Dongguan, People’s Republic of China
 
  The China Spallation Neutron Source¿CSNS¿accelerator comprises an 80MeV linac and a 1.6GeV rapid cycling synchrotron. It started operation in 2018, and the beam power delivered to the target has increased from 20kW to 140kW, step by step. Various beam loss studies have been performed through the accelerator to improve the beam power and availability. For the CSNS linac, the primary source of the beam loss is the halo generated by beam mismatches. In the upgrade plan of the CSNS, the beam current will increase five times, which requires more strict beam loss control. Much work is done during the design phase to keep the loss down to 1W/m of loss limit. This paper will report results obtained from beam experiments and optimization methods applied to the CSNS linac upgrade design.  
slides icon Slides WEA4C1 [3.736 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA4C1  
About • Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 13 October 2023
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THAFP02 Resonance Extraction Research Based on China Spallation Neutron Source 397
 
  • Y.W. An, L. Huang, Z.P. Li, S.Y. Xu, Y.S. Yuan
    IHEP, Beijing, People’s Republic of China
 
  Resonance extraction based on the RCS ring is an important aspect of beam applications. This article proposes a new design of resonance extraction based on the CSNS-RCS ring. By adjusting parameters such as the skew sextupole magnet, beam working point, RF-Kicker, etc., the simulation results from PyOrbit demonstrate the ability to rapidly extract a large number of protons within a few turns.  
slides icon Slides THAFP02 [1.497 MB]  
poster icon Poster THAFP02 [0.960 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP02  
About • Received ※ 01 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 01 November 2023
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