Author: Schütte, M.
Paper Title Page
TUPAB291 Subsystem Level Data Acquisition for the Optical Synchronization System at European XFEL 2167
 
  • M. Schütte, A. Eichler, T. Lamb, V. Rybnikov, H. Schlarb, T. Wilksen
    DESY, Hamburg, Germany
  
  The op­ti­cal syn­chro­niza­tion sys­tem for the Eu­ro­pean X-Ray Free-Elec­tron Laser pro­vides sub-10 fem­tosec­ond tim­ing pre­ci­sion * for the ac­cel­er­a­tor sub­sys­tems and ex­per­i­ments. This is achieved by phase lock­ing a mode-locked laser os­cil­la­tor to the main RF ref­er­ence and dis­trib­ut­ing the op­ti­cal pulse train car­ry­ing the time in­for­ma­tion via ac­tively prop­a­ga­tion-time sta­bi­lized op­ti­cal fibers to mul­ti­ple end-sta­tions. Mak­ing up roughly one per­cent of the en­tire Eu­ro­pean XFEL, it is the first sub­sys­tem to re­ceive a large-scale data ac­qui­si­tion sys­tem [2] for stor­ing not just hand-se­lected in­for­ma­tion, but in fact all di­ag­nos­tic, mon­i­tor­ing, and con­fig­u­ra­tion data rel­e­vant to the op­ti­cal syn­chro­niza­tion avail­able from the dis­trib­uted con­trol sys­tem in­fra­struc­ture. A min­i­mum of 100 TB per year may be stored in a per­sis­tent archive for long-term health mon­i­tor­ing and data min­ing whereas ex­cess data is stored in a short-term ring buffer for high-res­o­lu­tion fault analy­sis and fea­ture ex­trac­tion al­go­rithm de­vel­op­ment. This paper de­scribes scale, chal­lenges and first ex­pe­ri­ences from the op­ti­cal syn­chro­niza­tion data ac­qui­si­tion sys­tem.
* S. Schulz et al., "Few-Femtosecond Facility-Wide Sync. of the European XFEL," in Proc. FEL’19
** T. Wilksen et al., "A Bunch-Sync. DAQ System for the European XFEL," in Proc. ICALEPCS’17 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB291  
About • paper received ※ 14 May 2021       paper accepted ※ 17 June 2021       issue date ※ 24 August 2021  
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