Author: Wang, D.
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MOP1WA01
 The Shanghai Hard X-ray Free Electron Laser Project  
 
  • D. Wang
    SINAP, Shanghai, People's Republic of China
  
  This talk is about the Shang­hai Hard X-ray Free Elec­tron Laser Pro­ject.  
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THA1WA02
 Eliminating the Microbunching-Instability-Induced Sideband in a Soft X-Ray Self-Seeding Free-Electron Laser  
 
  • K.Q. Zhang, C. Feng, D. Wang
    SINAP, Shanghai, People's Republic of China
  
  Soft x-ray self-seed­ing has been proved to be a fea­si­ble method to im­prove the lon­gi­tu­di­nal co­her­ence of high gain free-elec­tron laser. How­ever, a pedestal-like side­band in the spec­trum has been ob­served in the ex­per­i­ment, which gen­er­ally lim­its the pu­rity of the ra­di­a­tion pulse and the user's ap­pli­ca­tion. The pre­vi­ous the­o­ret­i­cal study in­di­cates that the pedestal-like side­band is mainly in­duced by mi­crobunch­ing in­sta­bil­ity gen­er­ated from LINAC. In this paper, three di­men­sional sim­u­la­tions have been per­formed to con­firm the an­a­lyt­i­cal re­sults and show the for­ma­tion process of the spec­tral side­band. A prob­a­ble method is pro­posed to elim­i­nate the pedestal-like side­band by sim­ply in­sert­ing a mag­netic chi­cane be­fore the self-seed­ing FEL un­du­la­tor. The­o­ret­i­cal and nu­mer­i­cal sim­u­la­tions have been per­formed and the re­sults show that the pro­posed method can ef­fi­ciently elim­i­nate the mi­crobunch­ing-in­sta­bil­ity-in­duced side­band in a soft x-ray self-seed­ing FEL  
slides icon Slides THA1WA02 [8.258 MB]  
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