Author: Li, F.
Paper Title Page
TU3C05 Low Intensity Beam Current Measurement of the Associated Proton Beam Line at CSNS 174
 
  • R.Y. Qiu, W.L. Huang, F. Li, M.A. Rehman, Z.X. Tan, Zh.H. Xu, R.J. Yang, T. Yang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • M.Y. Liu, L. Zeng
    IHEP, Beijing, People’s Republic of China
  • Q.R. Liu
    UCAS, Beijing, People’s Republic of China
  
  Funding: National Natural Science Foundation, U2032165
The Associated Proton beam Experiment Platform (APEP) beamline is the first proton irradiation facility to use naturally-stripped protons which come from H− beams interacting with the residual gas in the linac beampipe at CSNS. The stripped beam current, which is in the order of 0.1% of the original H− beam and approximately 10 mi-croamperes, should be measured precisely to provide the proton number for irradiation experiments. Therefore, a low-intensity beam current measurement system was developed with considerations to eliminate the external interferences. An anti-interference design is adopted in this system with an elaboration of probes, cables and electronic low-noise technology to minimize the impact of environmental noise and interferences. This improves the signal-to-noise ratio and enables a more precise measurement of the microampere-level pulsed beam cur-rent. The system was installed and tested during the summer maintenance in 2021 and 2022. It shows a good agreement with the measurement of the Faraday cup. 		 
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C05  
About • Received ※ 14 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 28 September 2023 — Issue date ※ 29 September 2023
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WEP009
 Emittance Measurement of RF Ion Source in CSNS  
 
  • F. Li
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  The emittance reflectes the quality of the beam which is an important parameter of ion source. Oscillation of emittance and Twiss parameters in the negative ion (H−) beam is measured by application of a double-slit emittance monitor located at the RFQ entrance. The systematic error was valued in emittance measurement of CSNS RF ion source. This article mainly discussed the measurement accuracy and reliability of the double-slit emittance meter. Therefore it is shown that the working principle, mechanical disign, electronics and the application in CSNS RF ion source were introduced.  
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