Author: Langner, A.
Paper Title Page
TUPC36 First Realization and Performance Study of a Single-Shot Longitudinal Bunch Profile Monitor Utilizing a Transverse Deflecting Structure 456
 
  • M. Yan, C. Behrens, C. Gerth, R. Kammering, A. Langner, F. Obier, V. Rybnikov
    DESY, Hamburg, Germany
  • J. Wychowaniak
    TUL-DMCS, Łódź, Poland
  
  For the con­trol and op­ti­miza­tion of elec­tron beam pa­ra­me­ters at mod­ern free-elec­tron lasers (FEL), trans­verse de­flect­ing struc­tures (TDS) in com­bi­na­tion with imag­ing screens have been widely used as ro­bust lon­gi­tu­di­nal di­ag­nos­tics with sin­gle-shot ca­pa­bil­ity, high res­o­lu­tion and large dy­namic range. At the free-elec­tron laser in Ham­burg (FLASH), a lon­gi­tu­di­nal bunch pro­file mon­i­tor uti­liz­ing a TDS has been re­al­ized. In com­bined use with a fast kicker mag­net and an off-axis imag­ing screen, se­lec­tion and mea­sure­ment of a sin­gle bunch out of the bunch train with bunch spac­ing down to 1us can be achieved with­out af­fect­ing the re­main­ing bunches which con­tinue to gen­er­ate FEL ra­di­a­tion dur­ing user op­er­a­tion. Tech­ni­cal ob­sta­cles have been over­come such as sup­pres­sion of co­her­ent tran­si­tion ra­di­a­tion from the imag­ing screen, the con­tin­u­ous image ac­qui­si­tion and pro­cess­ing with the bunch train rep­e­ti­tion rate of 10Hz. The mon­i­tor, which pro­vides the lon­gi­tu­di­nal bunch pro­file and length, has been used rou­tinely at FLASH. In this paper, we pre­sent the setup and op­er­a­tion of the lon­gi­tu­di­nal bunch pro­file mon­i­tor as well as the per­for­mance dur­ing user op­er­a­tion.