Author: Yang, X.
Paper Title Page
WEP039
Operation Performance Evaluation of Accelerator Based on Cluster Analysis of Bunch-by-Bunch Diagnostic Data  
 
  • X. Yang
    SINAP, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • Y.M. Zhou
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
 
  In order to im­prove the op­er­at­ing per­for­mance of the par­ti­cle ac­cel­er­a­tor, it is bet­ter to de­velop a toolk­its to mon­i­tor and an­a­lyze the sub-health state of the fa­cil­ity in ad­di­tion to en­sur­ing the sta­bil­ity of basic pa­ra­me­ters such as beam cur­rent, life, trans­verse size, lon­gi­tu­di­nal length and orbit. The 3D bunch-by-bunch po­si­tion mea­sure­ment sys­tem com­bined with clus­ter analy­sis is a fea­si­ble so­lu­tion for this re­quire­ment. HOT­CAP is a gen­eral so­lu­tion, which is based on high-speed os­cil­lo­scope and de­vel­oped by SSRF, can de­liver charge and ab­solute 3D po­si­tion in­for­ma­tion bunch-by-bunch. Clus­ter­ing analy­sis is a method for mul­ti­di­men­sional data with com­plex struc­ture. The data can be ag­gre­gated and dis­cover the de­pen­den­cies be­tween data items. After the SSRF bunch-by-bunch mea­sure­ment sys­tem is put into op­er­a­tion, the data of in­jec­tion and steady-state op­er­a­tion are con­tin­u­ously ac­cu­mu­lated. From it, many in­for­ma­tion in­clud­ing 3D po­si­tions, 3D tunes, fill­ing pat­tern, re­filled charge and the 3D damp­ing times can be ex­tracted. In this paper, based on the op­er­a­tional data of SSRF and the clus­ter analy­sis, op­er­a­tional sta­tus of the stor­age ring and in­jec­tor is eval­u­ated.  
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TUP018
Longitudinal Parameter Measurement System Based on Time-Frequency Domain Joint Analysis  
 
  • HS. Wang, Y.M. Zhou
    SSRF, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • X. Yang
    UCAS, Beijing, People’s Republic of China
 
  This paper pro­poses a novel tech­nique for mea­sur­ing lon­gi­tu­di­nal bunch length by per­form­ing spec­tral analy­sis on the beam sig­nals to ex­tract the bunch length in­for­ma­tion for each bunch and each turn. A high-speed os­cil­lo­scope is used to cap­ture orig­i­nal but­ton sig­nal with more than 7000 turns in­for­ma­tion and an of­fline Python script is used to re­trieve bunch length and phase in­for­ma­tion. A streak cam­era is used to cal­i­brate the trans­fer func­tion of the ac­qui­si­tion sys­tem. Ex­per­i­ments were car­ried out at the Shang­hai Syn­chro­tron Ra­di­a­tion Fa­cil­ity and the Hefei Light Source by cap­tur­ing the elec­trode sig­nals with an os­cil­lo­scope dur­ing sin­gle bunch in­jec­tion and har­monic cav­ity tun­ing in the stor­age ring. The cal­i­brated lon­gi­tu­di­nal bunch length mea­sure­ment sys­tem yielded fa­vor­able re­sults, with a larger dy­namic range and higher time res­o­lu­tion com­pared to the streak cam­era. In the fu­ture, the sys­tem has the po­ten­tial to be trans­planted into a proces­sor to achieve on­line lon­gi­tu­di­nal beam mea­sure­ment for each bunch.  
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