Author: Baerenbold, F.
Paper Title Page
TUPF08 Characterization of Compressed Bunches in the SwissFEL Injector Test Facility 515
 
  • G.L. Orlandi, M. Aiba, F. Baerenbold, S. Bettoni, B. Beutner, H. Brands, P. Craievich, F. Frei, R. Ischebeck, E. Prat, T. Schietinger, V. Schlott
    PSI, Villigen PSI, Switzerland
  
  The qual­ity of the beam trans­verse emit­tance at the cath­ode and the uni­for­mity of the lon­gi­tu­di­nal com­pres­sion of the elec­tron bunch are es­sen­tial for the las­ing ef­fi­ciency of a Free Elec­tron Laser. In Swiss­FEL the lon­gi­tu­di­nal com­pres­sion of the elec­tron beam is per­formed by means of two mag­netic chi­canes and an off-crest ac­cel­er­a­tion scheme. The cur­va­ture in­duced on the beam lon­gi­tu­di­nal phase-space dur­ing the com­pres­sion can be com­pen­sated by means of an X-band cav­ity. The beam lon­gi­tu­di­nal phase-space can be ex­per­i­men­tally char­ac­ter­ized by means of a Trans­verse De­flect­ing Cav­ity (TDC) and a pro­file mon­i­tor in a dis­per­sive sec­tion. Lon­gi­tu­di­nal phase-space mea­sure­ments at the Swiss­FEL In­jec­tor Test Fa­cil­ity under com­pres­sion with and with­out X-band lin­earizer are pre­sented. In ad­di­tion, en­ergy spread mea­sure­ments done by mon­i­tor­ing the Syn­chro­tron Ra­di­a­tion (SR) emit­ted by the elec­tron beam in the dis­per­sive sec­tion of the chi­cane are shown. A com­par­i­son with nu­mer­i­cal sim­u­la­tions is pre­sented.