Author: Wei, Y.
Paper Title Page
MOPAB053 Progress of Lattice Design and Physics Studies on the High Energy Photon Source 229
 
  • Y. Jiao, Y. Bai, X. Cui, C.C. Du, Z. Duan, Y.Y. Guo, P. He, X.Y. Huang, D. Ji, H.F. Ji, S.C. Jiang, B. Li, C. Li, J.Y. Li, N. Li, X.Y. Li, P.F. Liang, C. Meng, W.M. Pan, Y.M. Peng, Q. Qin, H. Qu, S.K. Tian, J. Wan, B. Wang, J.Q. Wang, N. Wang, Y. Wei, G. Xu, H.S. Xu, F. Yan, C.H. Yu, Y.L. Zhao
    IHEP, Beijing, People’s Republic of China
  • X.H. Lu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Funding: Work supported by High Energy Photon Source (HEPS), a major national science and technology infrastructure and NSFC (11922512)
The High En­ergy Pho­ton Source (HEPS) is a 34-pm, 1360-m stor­age ring light source being built in the sub­urb of Bei­jing, China. The HEPS con­struc­tion started in mid-2019. While the physics de­sign has been ba­si­cally de­ter­mined, mod­i­fi­ca­tions on the HEPS ac­cel­er­a­tor physics de­sign have been made since 2019, in order to deal with chal­lenges emerg­ing from the tech­ni­cal and en­gi­neer­ing de­signs. In this paper, we will in­tro­duce the new stor­age ring lat­tice and in­jec­tor de­sign, and also pre­sent up­dated re­sults of re­lated physics is­sues, in­clud­ing im­ped­ance and col­lec­tive ef­fects, lat­tice cal­i­bra­tion, in­ser­tion de­vice ef­fects, in­jec­tion de­sign stud­ies, etc. 		 
poster icon Poster MOPAB053 [0.699 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB053  
About • paper received ※ 10 May 2021       paper accepted ※ 24 May 2021       issue date ※ 17 August 2021  
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TUPAB007 A Correction Scheme for the Magnet Imperfection on the CEPC Collider Ring 1346
 
  • B. Wang, Y. Wang, Y. Wei, C.H. Yu, Y. Zhang
    IHEP, Beijing, People’s Republic of China
  
  This paper de­scribes the error cor­rec­tion scheme for the CEPC CDR lat­tice in Higgs mode, which has a small beta func­tion at the in­ter­ac­tion point. The low emit­tance op­tics has an en­hanced sen­si­tiv­ity to the mag­net mis­align­ments and field er­rors, es­pe­cially for the final focus quadru­pole mis­align­ment. The mag­net im­per­fec­tion will cause the closed orbit dis­tor­tion and op­tics dis­tor­tion. The cor­rec­tion scheme for these mag­net im­per­fec­tions in­cludes the closed orbit cor­rec­tion, the dis­per­sion cor­rec­tion, the beta func­tion cor­rec­tion and the be­ta­tron cou­pling cor­rec­tion. The re­sult­ing per­for­mance and the dy­namic aper­ture for the cor­rected lat­tice are stud­ied.  
poster icon Poster TUPAB007 [1.075 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB007  
About • paper received ※ 14 May 2021       paper accepted ※ 09 June 2021       issue date ※ 14 August 2021  
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TUPAB304 Preliminary Investigation of the Noises and Updates on Physics Studies of FOFB in HEPS 2197
 
  • X.Y. Huang, Y. Jiao, Y. Wei
    IHEP, Beijing, People’s Republic of China
  
  High En­ergy Pho­ton Source (HEPS) is a Fourth-gen­er­a­tion stor­age ring light source in China and is under con­struc­tion. Noises, such as the am­bi­ent me­chan­i­cal vi­bra­tion and the power sup­ply rip­ples of mag­nets, may in­duce large orbit mo­tions of elec­tron bunches and hence dra­mat­i­cally de­grade the emit­ted pho­ton beam qual­ity. The ef­fect of noises be­comes sig­nif­i­cant and needs to be con­sid­ered very care­fully, es­pe­cially when the emit­tances of the elec­tron beam ap­proach the dif­frac­tion limit of x-ray. For the HEPS, the noises are mod­elled and the total beam orbit mo­tion is eval­u­ated con­sid­er­ing the spec­tral char­ac­ter­is­tics of all the trans­for­ma­tion processes from the er­rors to the orbit. In this paper, we pre­sent the pre­lim­i­nary cal­cu­la­tion of the ef­fects of noises in HEPS, and the con­trol of the orbit mo­tion with the FOFB sys­tem.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB304  
About • paper received ※ 17 May 2021       paper accepted ※ 02 July 2021       issue date ※ 16 August 2021  
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WEPAB033 Lattice Design of the CEPC Collider Ring for a High Luminosity Scheme 2679
 
  • Y. Wang, S. Bai, J. Gao, B. Wang, D. Wang, Y. Wei, J. Wu, C.H. Yu, J.Y. Zhai, Y. Zhang, Y.S. Zhu
    IHEP, Beijing, People’s Republic of China
  • Y. Zhang
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
  
  A high lu­mi­nos­ity scheme of the CEPC has been pro­posed aim­ing to in­crease the lu­mi­nos­ity mainly at Higgs and Z modes. In this paper, the high lu­mi­nos­ity scheme will be in­tro­duced briefly, in­clud­ing the beam pa­ra­me­ters and RF stag­ing. Then, the lat­tice de­sign of the CEPC col­lider ring for the high lu­mi­nos­ity scheme will be pre­sented, in­clud­ing the bare lat­tice de­sign and dy­namic aper­ture op­ti­miza­tion at Higgs en­ergy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB033  
About • paper received ※ 20 May 2021       paper accepted ※ 05 July 2021       issue date ※ 27 August 2021  
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THPAB258 Status of Time-Domain Simulation for the Fast Orbit Feedback System at the HEPS 4311
 
  • Y. Wei, Z. Duan, X.Y. Huang, Y. Jiao
    IHEP, Beijing, People’s Republic of China
  
  High En­ergy Pho­ton Source (HEPS) is a com­plex de­signed at ul­tra-low emit­tance. A fast orbit feed­back sys­tem is pro­posed to meet the re­quire­ment of beam orbit sta­bil­ity at the sub-mi­cron level. In this paper, we pre­sent our work on set­ting up an orbit feed­back process com­bined with noise model, sys­tem mod­el­ing, and par­ti­cle track­ing in the time do­main. RF phase pa­ra­me­ter is ad­justed to­gether with fast cor­rec­tors to mit­i­gate the orbit fluc­tu­a­tion due to en­ergy vi­bra­tion. The pre­lim­i­nary re­sults are shown here. By the fol­low­ing op­ti­miza­tion, we hope to pro­vide an ef­fec­tive tool to spec­ify and con­fig­ure the FOFB sys­tem with the sim­u­la­tion.  
poster icon Poster THPAB258 [1.334 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB258  
About • paper received ※ 19 May 2021       paper accepted ※ 27 July 2021       issue date ※ 31 August 2021  
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