Author: Dursun, B.
Paper Title Page
TUPAB302 Arrival Time Stabilization at Flash Using the Bunch Arrival Corrector Cavity (BACCA) 2194
 
  • B. Lautenschlager, Ł. Butkowski, M.K. Czwalinna, B. Dursun, M. Hierholzer, S. Pfeiffer, H. Schlarb, Ch. Schmidt
    DESY, Hamburg, Germany
  
  For pump-probe and seed­ing ex­per­i­ments at free elec­tron lasers, a fem­tosec­ond pre­cise bunch ar­rival time sta­bil­ity is manda­tory. To sta­bi­lize the ar­rival times a fast lon­gi­tu­di­nal intra bunch-train feed­back (L-IBFB) using bunch ar­rival time mon­i­tors is ap­plied. The elec­tron bunch en­ergy prior to a bunch com­pres­sion chi­cane is mod­u­lated by su­per­con­duct­ing radio fre­quency (SRF) cav­i­ties to com­pen­sate fast ar­rival time fluc­tu­a­tions of the sub­se­quent bunches. A broad­band nor­mal con­duct­ing RF cav­ity was in­stalled in front of the first bunch com­pres­sion chi­cane at FLASH. The L-IBFB uses the nor­mal con­duct­ing cav­ity for small but fast en­ergy cor­rec­tions to­gether with the SRF cav­i­ties for larger and slower cor­rec­tions. Cur­rent mea­sure­ments show ar­rival time sta­bil­i­ties of the elec­tron bunches to­wards 5 fs (rms) at the end of the linac, if the nor­mal con­duct­ing cav­ity acts to­gether with the SRF cav­i­ties in the L-IBFB sys­tem.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB302  
About • paper received ※ 19 May 2021       paper accepted ※ 23 June 2021       issue date ※ 26 August 2021  
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