Author: Huang, M.Y.
Paper Title Page
MOPAB200 Parameters Measurements of Proton Beam Extracted from CSNS/RCS 668
 
  • Z.P. Li, Y.W. An, M.Y. Huang
    IHEP, Beijing, People’s Republic of China
  • Y. Li, S.Y. Xu
    DNSC, Dongguan, People’s Republic of China
  • H.Y. Liu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  In order to study the emit­tance evo­lu­tion of the cir­cu­lat­ing beam in the fast-cy­cling syn­chro­tron (RCS) of the Chi­nese Spal­la­tion Neu­tron Source (CSNS), pa­ra­me­ter mea­sure­ments of the beam ex­tracted at dif­fer­ent times were car­ried out. The mea­sure­ments were mainly based on wire-scan­ners mounted in RCS to tar­get trans­port line (RTBT) for beam pro­file mea­sure­ment, and dif­fer­ent meth­ods were ap­plied in the so­lu­tion processes. The emit­tance and C.S pa­ra­me­ters of the ex­tracted beam at dif­fer­ent times were ob­tained and stud­ied, which pro­vided an im­por­tant ref­er­ence basis for the beam com­mis­sion­ing of RCS. The beam en­ve­lope along the RTBT has been matched and re-mea­sured, which was in good agree­ment with the de­sign op­tics.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB200  
About • paper received ※ 19 May 2021       paper accepted ※ 21 May 2021       issue date ※ 25 August 2021  
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TUPAB196 Achievement of 100-kW Beam Operation in CSNS/RCS 1869
 
  • S.Y. Xu, Y.W. An, J. Chen, L. Huang, M.Y. Huang, Y. Li, S. Wang
    IHEP, Beijing, People’s Republic of China
  • H.Y. Liu, X.H. Lu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  The China Spal­la­tion Neu­tron Source (CSNS) is an ac­cel­er­a­tor-based sci­ence fa­cil­ity. CSNS is de­signed to ac­cel­er­ate pro­ton beam pulses to 1.6 GeV ki­netic en­ergy, strik­ing a solid metal tar­get to pro­duce spal­la­tion neu­trons. CSNS has two major ac­cel­er­a­tor sys­tems, a lin­ear ac­cel­er­a­tor (80 MeV Linac) and a 1.6 GeV rapid cy­cling syn­chro­tron(RCS). The RCS ac­cu­mu­lates and ac­cel­er­ates the pro­ton beam to 1.6 GeV and then ex­tracts the beam to the tar­get at the rep­e­ti­tion rate of 25 Hz. The Beam com­mis­sion­ing of CSNS/RCS had been started since April 2017. The most im­por­tant issue in high-power beam com­mis­sion­ing is the beam loss con­trol, as well as the con­trol of in­duced ac­tiv­i­ties, to meet the re­quire­ment of man­ual main­te­nance. A se­ries of beam loss op­ti­miza­tion work had been done to re­duce the un­con­trolled beam loss. At the end of Feb­ru­ary 2020, the CSNS reached the de­sign beam power of 100 kW with very low un­con­trolled beam loss.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB196  
About • paper received ※ 19 May 2021       paper accepted ※ 31 May 2021       issue date ※ 28 August 2021  
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WEPAB199 Study on the Important Technologies of 300MeV Upgrade for the CSNS Injection System 3089
 
  • M.Y. Huang, C.D. Deng, L. Kang, L. Liu, Y. Liu, X. Qi, S. Wang, Q.B. Wu, Y.W. Wu, S.Y. Xu, W.Q. Zhang, Y.L. Zhang
    IHEP, Beijing, People’s Republic of China
  • J.X. Chen, T. Huang, H.C. Liu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Funding: This work was supported by National Natural Science Foundation of China (Project Nos. U1832210 and 12075134).
The China Spal­la­tion Neu­tron Source (CSNS-I) have achieved the de­sign goal of 100kW beam power on the tar­get in Feb., 2020. As the sec­ond phase of the CSNS, CSNS-II will achieve a beam power on the tar­get of 500 kW. The in­jec­tion en­ergy of CSNS-II will be in­creased from 80 MeV to 300 MeV and the av­er­age beam cur­rent of the Linac will in­crease 5 times. There­fore, the in­jec­tion sys­tem will re­quire a com­plete up­grade. In this paper, the de­sign scheme of the in­jec­tion sys­tem for CSNS-II will be in­tro­duced. The key tech­nolo­gies of the up­grade in­jec­tion sys­tem will be care­fully an­a­lyzed and pre-de­vel­oped, such as the pulse power sup­plies and their mag­nets, the spe­cial-shaped ce­ramic vac­uum cham­bers, the main strip­ping foil, the stripped elec­tron col­lec­tion, and so on. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB199  
About • paper received ※ 17 May 2021       paper accepted ※ 09 June 2021       issue date ※ 21 August 2021  
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WEPAB200 Study on the Measurement and Residual Dose of the CSNS Stripping Foil 3093
 
  • M.Y. Huang, L. Kang, S. Wang, Q.B. Wu, S.Y. Xu, Y.L. Zhang
    IHEP, Beijing, People’s Republic of China
  • J.X. Chen, W.L. Huang, H.C. Liu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Funding: This work was supported by National Natural Science Foundation of China (Project Nos. 12075134 and U1832210).
In this paper, firstly, the ap­pli­ca­tion and ser­vice life of the main strip­ping foil for the China Spal­la­tion Neu­tron Source (CSNS) were in­tro­duced. The strip­ping ef­fi­ciency of the main strip­ping foil have been mea­sured and stud­ied. Then, by using the codes FLUKA and ORBIT, the par­ti­cle scat­ter­ing of the main strip­ping foil has been sim­u­lated and the the­o­ret­i­cal resid­ual doses in the in­jec­tion re­gion caused by the foil scat­ter­ing were ob­tained. By weekly mea­sure­ment of the resid­ual doses in the in­jec­tion re­gion, the ac­tual resid­ual doses near the main strip­ping foil were given. The resid­ual doses com­par­i­son re­sults have con­firmed that the par­ti­cle scat­ter­ing of the main strip­ping foil is the most im­por­tant source of the resid­ual doses in the in­jec­tion re­gion. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB200  
About • paper received ※ 09 May 2021       paper accepted ※ 25 August 2021       issue date ※ 23 August 2021  
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THPAB185 Solution to Beam Transmission Decline in the CSNS Linac Operation Using Measurements and Simulations 4134
 
  • J. Peng, M.T. Li, X.H. Lu, X.B. Luo
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan
    IHEP, Beijing, People’s Republic of China
  
  The CSNS linac op­er­a­tion at its de­sign av­er­age power cur­rently. How­ever, the beam trans­mis­sion is de­clin­ing and the beam loss is in­creas­ing dur­ing the op­er­a­tion. With sim­u­la­tions and ex­per­i­ments, we found there is a long lon­gi­tu­di­nal tail exist in the beam bunch out­put from the RFQ. And this tail caused the beam loss in the fol­low­ing linac. After in­hi­bi­tion of the lon­gi­tu­di­nal tail in the beam bunch, the beam trans­mis­sion in op­er­a­tion can keep sta­ble.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB185  
About • paper received ※ 19 May 2021       paper accepted ※ 01 July 2021       issue date ※ 02 September 2021  
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