Author: Ning, C.J.
Paper Title Page
MOPAB299 STRUCTURAL OPTIMIZATION DESIGN OF FARADAY CUP FOR BEAM COMMISSIONING OF CSNS 943
 
  • A.X. Wang, L. Kang, M. Meng, J.L. Sun
    IHEP, Beijing, People’s Republic of China
  • J.X. Chen, H.Y. He, L. Liu, R.H. Liu, X.J. Nie, C.J. Ning, R.Y. Qiu, G.Y. Wang, T. Yang, J.B. Yu, Y.J. Yu, J.S. Zhang, D.H. Zhu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Fara­day cup is used to ab­sorb and stop the beam dur­ing the two phases of beam com­mis­sion­ing, such as the front end (FE) sys­tem and the tem­po­rary line after the drift tube linac (DTL) at the Chi­nese Spal­la­tion Neu­tron Source (CSNS). Ac­cord­ing to the beam phys­i­cal pa­ra­me­ters, graphite is se­lected to stop the beam di­rectly, and oxy­gen-free cop­per which is just be­hind the graphite as the ther­mal con­duc­tive ma­te­r­ial. By the analy­sis and com­par­i­son of the tar­get type and cool­ing ef­fi­ciency, the sin­gle slant tar­get is adopted. The in­ci­dent angle be­tween the tar­get sur­face and the beam is set as 10°, mean­while a new wa­ter­fall type wa­ter-cool­ing struc­ture with par­al­lel tun­nels is de­signed to im­prove the cool­ing ef­fi­ciency. The fi­nite el­e­ment soft­ware ANSYS is used for ther­mal analy­sis of the model, by which the di­am­e­ter and in­ter­val of water cool­ing tun­nels are op­ti­mized. The fara­day cup dis­cussed in this paper is fi­nally suc­cess­fully in­stalled in the beam com­mis­sion­ing line and went well.  
poster icon Poster MOPAB299 [1.113 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB299  
About • paper received ※ 13 May 2021       paper accepted ※ 08 July 2021       issue date ※ 19 August 2021  
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TUPAB194 Operation Status of CSNS/RCS Transverse Collimation System 1862
 
  • J.B. Yu, J.X. Chen, L. Liu, X.J. Nie, C.J. Ning, G.Y. Wang, A.X. Wang, J.S. Zhang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Kang, Q.B. Wu, S.Y. Xu
    IHEP, Beijing, People’s Republic of China
  
  Funding: Natural Science Foundation of Guangdong Province 2018A030313959
In order to meet the re­quire­ments of daily main­te­nance of CSNS/RCS, the trans­verse col­li­ma­tion sys­tem was de­signed to con­cen­trate the un­con­trol­lable beam loss in this re­gion. Based on phys­i­cal pa­ra­me­ters, con­sid­er­ing the pro­cess­ing tech­nol­ogy, the area was ra­tio­nally arranged; com­bined with the re­quire­ments of phys­i­cal and ra­di­a­tion pro­tec­tion, under the premise of meet­ing the use re­quire­ments, fully con­sider the limit switch, me­chan­i­cal hard limit and other com­po­nents, in­creas­ing the out­put con­trol sig­nals of ro­tary en­coder and dis­place­ment sen­sor, the move­ment of the ab­sorbers were mon­i­tored. At pre­sent, the beam col­li­ma­tion sys­tem has been run­ning with no me­chan­i­cal fail­ure for two years on CSNS, and it plays an ac­tive role in beam power boost and beam loss con­trol, which proves that the struc­tural de­sign of the sys­tem is rea­son­able. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB194  
About • paper received ※ 17 May 2021       paper accepted ※ 11 June 2021       issue date ※ 17 August 2021  
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WEPAB397 Design of the Two-Layer Girder for Accelerating Tube 3636
 
  • X.J. Nie, H.Y. He, L. Kang
    IHEP, Beijing, People’s Republic of China
  • J.X. Chen, L. Liu, R.H. Liu, C.J. Ning, A.X. Wang, G.Y. Wang, Y.J. Yu, J.S. Zhang, D.H. Zhu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • J.B. Yu
    DNSC, Dongguan, People’s Republic of China
  
  An ac­cel­er­at­ing tube is one kind of im­por­tant ac­cel­er­a­tion equip­ment of a lin­ear ac­cel­er­a­tor. It is often made up of oxy­gen-free cop­per with a long tubu­lar struc­ture. It’s easy to suf­fer from de­for­ma­tion. Based on sup­port re­quire­ments, the rea­son­able struc­ture of the girder was ob­tained. Four sup­port­ing blocks were in­stalled on the top sur­face of alu­minum pro­file with the uni­form dis­tri­b­u­tion along the beam di­rec­tion. The sup­port strength with sta­tic con­di­tion and dif­fer­ent work­ing con­di­tions were checked by ANSYS sim­u­la­tion cal­cu­la­tion to en­sure the sta­ble op­er­a­tion of the girder. The two-layer girder can be used as a ref­er­ence for other sim­i­lar slen­der part for its sim­ple struc­ture and re­li­able sup­port.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB397  
About • paper received ※ 14 May 2021       paper accepted ※ 01 September 2021       issue date ※ 22 August 2021  
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THPAB282 Optimization Design of Four-Point Vibration Isolation Support for Spallation Neutron Source Vibration Magnet 4352
 
  • J.S. Zhang, J.X. Chen, H.Y. He, L. Liu, R.H. Liu, C.J. Ning, G.Y. Wang, A.X. Wang, J.B. Yu, Y.J. Yu, D.H. Zhu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Kang
    IHEP, Beijing, People’s Republic of China
  
  Chi­nese spal­la­tion neu­tron source (CSNS) RCS of the di­pole mag­nets by 25 Hz si­nu­soidal al­ter­nat­ing cur­rent (AC) with dc bias field, be­cause the mag­net will pro­duce eddy cur­rent ef­fect caused by the vi­bra­tion, this safe and re­li­able op­er­a­tion of the long-term im­pact of mag­nets, so need to CSNS/RCS di­pole mag­nets, a sup­port sys­tem for dy­namic char­ac­ter­is­tic re­search and the per­for­mance of vi­bra­tion iso­la­tion de­sign. The me­chan­i­cal model of ac di­pole mag­net and sup­port sys­tem is first es­tab­lished, and ANSYS the­o­ret­i­cal modal analy­sis and ex­per­i­men­tal modal ver­i­fi­ca­tion are car­ried out. On this basis, vi­bra­tion iso­la­tion pa­ra­me­ters of the four-point sup­port sys­tem are stud­ied. The the­o­ret­i­cal analy­sis and the ex­per­i­men­tal re­sults of modal pa­ra­me­ters are con­sis­tent, which shows that the ANSYS analy­sis model is cor­rect and re­li­able. The dy­namic sys­tem pa­ra­me­ter de­sign method es­tab­lished in this paper can be ap­plied to var­i­ous equip­ment of AC power ac­cel­er­a­tor. The final ex­per­i­men­tal ver­i­fi­ca­tion shows that the total dis­place­ment am­pli­tude of the iso­la­tor to the Y di­rec­tion of the mag­net on the mag­netic sup­port de­creases by 62.3%.  
poster icon Poster THPAB282 [0.426 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB282  
About • paper received ※ 16 May 2021       paper accepted ※ 02 September 2021       issue date ※ 27 August 2021  
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THPAB300 Structure Design and Motion Analysis of 6-DOF Sample Positioning Platform 4387
 
  • G.Y. Wang, J.X. Chen, L. Liu, R.H. Liu, C.J. Ning, A.X. Wang, J.B. Yu, Y.J. Yu, J.S. Zhang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Kang
    IHEP, Beijing, People’s Republic of China
  
  with the de­vel­op­ment of syn­chro­tron ra­di­a­tion (SR) light source tech­nol­ogy, in order to meet the re­quire­ments of sam­ple po­si­tion­ing plat­form of some beam­line sta­tions, such as ad­just­ing res­o­lu­tion at the nanome­ter level and hav­ing larger sam­ple scan­ning dis­tance, a six de­gree of free­dom po­si­tion­ing plat­form based on space­fab struc­ture was de­vel­oped. The key tech­nolo­gies such as co­or­di­nate pa­ra­me­ter trans­for­ma­tion, kine­mat­ics analy­sis, and ad­just­ment de­cou­pling al­go­rithm of 6-DOF pose ad­just­ment sys­tem of Space­FAB po­si­tion­ing plat­form are mainly stud­ied. A 6-DOF plat­form dri­ven by a step­ping motor is de­signed and man­u­fac­tured. The con­trol sys­tem of the 6-DOF Plat­form Based on bus con­trol is de­vel­oped, and the ad­just­ment ac­cu­racy is tested. The re­peated po­si­tion­ing ac­cu­racy of the plat­form in three di­rec­tions is 0.019 mm, and that of ro­ta­tion is 0.011 ° in three di­rec­tions. The test re­sults ver­ify the cor­rect­ness of the the­o­ret­i­cal analy­sis of Space­FAB struc­ture and the ra­tio­nal­ity of mech­a­nism de­sign. The re­search on the plat­form mo­tion al­go­rithm and con­trol sys­tem has im­por­tant ref­er­ence value for the fol­low-up re­search of large stroke nano-6-dof po­si­tion­ing plat­form.  
poster icon Poster THPAB300 [1.517 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB300  
About • paper received ※ 16 May 2021       paper accepted ※ 06 July 2021       issue date ※ 02 September 2021  
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