Author: Li, Y.
Paper Title Page
MOPAB189 Beam Commissioning of XiPAF Synchrotron 639
 
  • H.J. Yao, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, W.B. Ye, H.J. Zeng, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W.L. Liu, D. Wang, Z.M. Wang
    NINT, Shannxi, People’s Republic of China
  
  XiPAF (Xi’an 200MeV Pro­ton Ap­pli­ca­tion Fa­cil­ity) is a pro­ject to ful­fill the need for the ex­per­i­men­tal sim­u­la­tion of the space ra­di­a­tion en­vi­ron­ment. It com­prises a 7 MeV H− linac, a 60-230 MeV pro­ton syn­chro­tron, and ex­per­i­men­tal sta­tions. The In­stal­la­tion of the syn­chro­tron, beam­line and one ex­per­i­men­tal sta­tion were com­pleted at the end of De­cem­ber 2019, and com­mis­sion­ing has just begun. Cir­cu­lat­ing beam around the syn­chro­tron was ob­served on the first day of op­er­a­tion, and now 10-200 MeV pro­ton beam di­rectly ex­tracted from the syn­chro­tron had been trans­ported to the ex­per­i­men­tal sta­tion for user ex­per­i­ments. The re­sults of the com­mis­sion­ing and data analy­sis are pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB189  
About • paper received ※ 18 May 2021       paper accepted ※ 21 May 2021       issue date ※ 17 August 2021  
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TUPAB326 Injection Optimization and Study of XiPAF Synchrotron 2264
 
  • X.Y. Liu, X. Guan, Y. Li, M.W. Wang, X.W. Wang, H.J. Yao, W.B. Ye, H.J. Zeng, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
    NINT, Shannxi, People’s Republic of China
  
  The syn­chro­tron of XiPAF (Xi’an 200MeV pro­ton ap­pli­ca­tion Fa­cil­ity) is a com­pact pro­ton syn­chro­tron, which using H- strip­ping in­jec­tion and phase space paint­ing scheme. Now XiPAF is under com­mis­sion­ing with some achieve­ments, the cur­rent in­ten­sity after in­jec­tion reach 43mA, the cor­re­spond­ing par­ti­cle num­ber is 2.3·1011, and the in­jec­tion ef­fi­ciency is 57%. The sim­u­la­tion re­sults by Py­Or­bit show that the in­jec­tion ef­fi­ciency is 77%. In this paper, we re­port how the in­jec­tion in­ten­sity and ef­fi­ciency were op­ti­mized. We an­a­lyzed the dif­fer­ence be­tween sim­u­la­tion and ex­per­i­ments, and quan­ti­ta­tively in­ves­ti­gate the fac­tors af­fect­ing in­jec­tion ef­fi­ciency through ex­per­i­ments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB326  
About • paper received ※ 14 May 2021       paper accepted ※ 22 June 2021       issue date ※ 22 August 2021  
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WEPAB205 XiPAF Synchrotron Slow Extraction Commissioning 3106
 
  • W.B. Ye, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, H.J. Yao, H.J. Zeng, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
    NINT, Shannxi, People’s Republic of China
  
  Xi’an 200 MeV Pro­ton Ap­pli­ca­tion Fa­cil­ity (XiPAF) is a pro­ject to ful­fill the need for the ex­per­i­men­tal sim­u­la­tion of the space ra­di­a­tion en­vi­ron­ment. It com­prises a 7 MeV H− linac, a 60~230 MeV pro­ton syn­chro­tron, and ex­per­i­men­tal sta­tions. Slow ex­trac­tion com­mis­sion­ing for 60 MeV pro­ton beam in XiPAF syn­chro­tron has been fin­ished. After com­mis­sion­ing, the max­i­mal ex­per­i­ment ex­trac­tion ef­fi­ciency with the RF-knock­out (RF-KO) method can up to 85%. The rea­son for beam loss has been an­a­lyzed and pre­sented in this paper. Be­sides, an ex­per­i­ment of mul­ti­ple en­ergy ex­trac­tion has been con­ducted in XiPAF syn­chro­tron. The pro­ton beams of 3 dif­fer­ent en­er­gies were suc­cess­fully ex­tracted in 1.54 s.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB205  
About • paper received ※ 18 May 2021       paper accepted ※ 07 July 2021       issue date ※ 31 August 2021  
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THPAB317 Experiment and Simulation Study on the Capture and Acceleration Process of XiPAF Synchrotron 4409
 
  • Y. Li, X. Guan, X.Y. Liu, M.W. Wang, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W.L. Liu, D. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
    NINT, Shannxi, People’s Republic of China
  
  The beam com­mis­sion­ing of the cap­ture and ac­cel­er­a­tion process on the XiPAF (Xi’an 200MeV Pro­ton Ap­pli­ca­tion Fa­cil­ity) syn­chro­tron has been car­ried out. The ef­fi­ciency of the ex­per­i­ment re­sults has been com­pared with the sim­u­la­tion re­sults. At pre­sent, the ef­fi­ciency of the cap­ture process with sin­gle-har­monic is about 73%, and the ac­cel­er­a­tion ef­fi­ciency is about 82%, and the sim­u­la­tion re­sults are 77% and 96% with­out space charge ef­fect, re­spec­tively. In order to im­prove ef­fi­ciency, dual-har­monic was used dur­ing the cap­ture and ac­cel­er­a­tion process. Dur­ing the ex­per­i­ment, the cap­ture ef­fi­ciency was in­creased by 5%, and the ac­cel­er­a­tion ef­fi­ciency was in­creased by 4%. The cap­ture ef­fi­ciency de­creases with the in­crease of the max­i­mum RF volt­ages. We an­a­lyzed the rea­sons for the de­crease in cap­ture ef­fi­ciency. In the next step, fur­ther ver­i­fi­ca­tion will be car­ried out through ex­per­i­ments under dif­fer­ent con­di­tions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB317  
About • paper received ※ 19 May 2021       paper accepted ※ 08 July 2021       issue date ※ 23 August 2021  
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THPAB318 Uniformization of the Transverse Beam Profile with Nonlinear Magnet 4413
 
  • Y. Li, X. Guan, X.Y. Liu, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • Y. Yang
    NINT, Shannxi, People’s Republic of China
  
  The beam gen­er­ated after slow ex­trac­tion of the syn­chro­tron is al­ways not uni­form and asym­met­ri­cal in trans­verse dis­tri­b­u­tion. In prac­tice, ra­di­a­tion ther­apy or ra­di­a­tion ir­ra­di­a­tion re­quires a high de­gree of uni­for­mity of beam spot. There­fore, it is nec­es­sary to ad­just the beam dis­tri­b­u­tion with a non­lin­ear mag­net and other el­e­ments on the trans­port line from syn­chro­tron ring to beam tar­get sta­tion. Non­lin­ear mag­net has high re­quire­ments on beam qual­ity. Be­fore pass­ing through the non­lin­ear mag­net field, the beam cen­ter can be ad­justed by tak­ing ad­van­tage of the gra­di­ent change dis­tri­b­u­tion of the non­lin­ear mag­net’s trans­verse field map to achieve uni­form dis­tri­b­u­tion at the tar­get sta­tion. As an ex­am­ple, we use the pa­ra­me­ters of heavy ions of XiPAF (Xi’an 200MeV Pro­ton Ap­pli­ca­tion Fa­cil­ity) to sim­u­late the beam trans­port from syn­chro­tron ring to beam tar­get sta­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB318  
About • paper received ※ 20 May 2021       paper accepted ※ 08 July 2021       issue date ※ 21 August 2021  
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