Author: Lautenschlager, 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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THXB02 Beam Arrival Stability at the European XFEL 3714
 
  • M.K. Czwalinna, J. Kral, B. Lautenschlager, J. Müller, H. Schlarb, S. Schulz, B. Steffen
    DESY, Hamburg, Germany
  • R. Boll, H. Kirkwood, J. Koliyadu, R. Letrun, J. Liu, F. Pallas, D.E. Rivas, T. Sato
    EuXFEL, Schenefeld, Germany
  
  Free elec­tron laser fa­cil­i­ties, such as the Eu­ro­pean XFEL, make in­creas­ingly high de­mands on the longterm tem­po­ral sta­bil­ity and uni­for­mity of the elec­tron bunches, as pump-probe ex­per­i­ments mean­while aim for tim­ing sta­bil­i­ties of few fem­tosec­onds resid­ual jit­ter only. For a beam-based feed­back con­trol of the lin­ear ac­cel­er­a­tor, elec­tro-op­ti­cal bunch ar­rival-time mon­i­tors are de­ployed, achiev­ing a time res­o­lu­tion bet­ter than 3 fs. In a first at­tempt, we re­cently demon­strated a beam-based feed­back sys­tem, re­duc­ing the ar­rival time jit­ter of the elec­tron bunches to the 10 fs level with sta­ble op­er­a­tion over hours. For pump-probe ex­per­i­ments it is cru­cial to equally ver­ify this new level of pre­ci­sion in the FEL pulse ar­rival time with in­de­pen­dent meth­ods. In this work, we are dis­cussing first re­sults from ex­am­in­ing the fa­cil­ity-wide tem­po­ral sta­bil­ity at the Eu­ro­pean XFEL, with at­ten­tion to the con­tri­bu­tions of var­i­ous sub-sys­tems and on the dif­fer­ent time scales.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXB02  
About • paper received ※ 19 May 2021       paper accepted ※ 20 July 2021       issue date ※ 23 August 2021  
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