Author: Liu, M.Y.
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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poster icon Poster TU3C05 [1.160 MB]  
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
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP014 Design and Test of a Prototype 324 MHz RF Deflector in the Bunch Shape Monitor for CSNS-II Linac Upgrade 219
 
  • W.L. Huang, X.J. Nie
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • M.Y. Liu, X.Y. Liu, Y.F. Sui
    IHEP, Beijing, People’s Republic of China
  • Q.R. Liu
    UCAS, Beijing, People’s Republic of China
 
  Funding: Natural Science Foundation of Guangdong Province, 2021A1515010269 National Natural Science Foundation, 11475204
Dur­ing the up­grade of linac in CSNS-II, the beam in-jec­tion en­ergy will in­crease from 80.1MeV to 300MeV and the beam power from 100kW to 500kW. A com-bined lay­out of su­per­con­duct­ing spoke cav­i­ties and el­lip-tical cav­i­ties is adopted to ac­cel­er­ate H beam to 300MeV. Due to a ~10ps short bunch width at the exit of the spoke SC sec­tion, the lon­gi­tu­di­nal beam den­sity dis-tri­b­u­tion will be mea­sured by bunch shape mon­i­tors using low en­ergy sec­ondary emis­sion elec­trons. As the most im­por­tant part of a bunch shape mon­i­tor, a pro­to­type 324MHz RF de­flec­tor is de­signed and tuned on the basis of a quasi-sym­met­ric λ/2 325MHz coax­ial res­ona-tor, which was fab­ri­cated for the C-ADS pro­ton ac­cel­era-tor pro­ject. Pre­lim­i­nary pa­ra­me­ters of the bunch shape mon­i­tor are pre­sented. Sim­u­la­tion of the RF de­flec­tor and test re­sults in the lab­o­ra­tory are de­scribed and analysed.
 
poster icon Poster TUP014 [0.648 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP014  
About • Received ※ 30 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)