Author: Wang, HS.
Paper Title Page
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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