Author: Buck, J.
Paper Title Page
MOP012 Implementation Phase of the European XFEL Photon Diagnostics 41
 
  • J. Grünert, J. Buck, F. Dietrich, W. Freund, A. Koch, M. Planas
    XFEL. EU, Hamburg, Germany
  
  The Eu­ro­pean XFEL fa­cil­ity with 3 un­du­la­tors and ini­tially 6 ex­per­i­men­tal end-sta­tions re­quires an ex­ten­sive set of pho­ton beam di­ag­nos­tics for com­mis­sion­ing and user op­er­a­tion, ca­pa­ble of han­dling the ex­treme bril­liance and its in­her­ent dam­age po­ten­tial, and the high intra bunch train rep­e­ti­tion rate of 4.5MHz, po­ten­tially caus­ing ad­di­tional dam­age by high heat loads and mak­ing shot-to-shot di­ag­nos­tics very de­mand­ing [1]. After ex­ten­sive de­sign [2-4] and pro­to­type stud­ies, in 2014 the in­stal­la­tion of the pho­ton beam de­vices starts with the equip­ment in the first pho­ton tun­nel XTD2 which is where the SASE1 hard X-ray un­du­la­tor is lo­cated. This con­tri­bu­tion re­ports on the de­vice con­struc­tion progress by fo­cus­ing on the XTD2 tun­nel de­vices and their im­ple­men­ta­tion into the tun­nel en­vi­ron­ment. [1] J.​Grünert, Frame­work for X-Ray Pho­ton Di­ag­nos­tics at the Eu­ro­pean XFEL, TR-2012-003, 04/2012 [2] J.​Buck, On­line Pho­toe­mis­sion Time-of-Flight Spec­trom­e­ter for X-ray Pho­ton Di­ag­nos­tics, TR-2012-002, 06/2012 [3] C.​Ozkan, Con­cep­tual de­sign re­port for Imag­ing Sta­tions at the Eu­ro­pean XFEL, TR-2012-004, 02/2012 [4] W.​Freund, The Eu­ro­pean XFEL Un­du­la­tor Com­mis­sion­ing Spec­trom­e­ter, XFEL. EU 05/2011  
 
MOP014 X-ray Photon Temporal Diagnostics for the European XFEL 45
 
  • J. Liu, J. Buck, F. Dietrich, W. Freund, J. Grünert, M. Meyer
    XFEL. EU, Hamburg, Germany
  
  Eu­ro­pean XFEL (XFEL. EU) that will com­mis­sion­ing in 2016 shows great fea­tures on its ex­tremely high num­ber of light bul­lets (27000 p/s) and ex­tremely high av­er­age bril­liance. The FEL pulses in XFEL. EU are pro­duced in a 10 Hz bunch trains that con­tains 2700 sub-pulses within the 600 μs time in­ter­vals, cor­re­spond­ing to a 220 ns sub-pulse sep­a­ra­tion and 4.5 MHz rep­e­ti­tion rate. Char­ac­ter­iz­ing the tem­po­ral prop­er­ties of the high rep­e­ti­tion rate FEL pulses that im­plic­itly dif­fer­ent from shot to shot is im­por­tant for “pump and probe” ex­per­i­ments and data in­ter­pre­ta­tion. Here we re­port the con­cept and re­cent progress about tem­po­ral di­ag­nos­tic for XFEL. EU. THz streak­ing tech­nique and spec­tral en­cod­ing will be im­ple­mented con­sid­er­ing the high rep­e­ti­tion rate and high bril­liance of XFEL. EU. Laser based THz gen­er­a­tion, op­ti­miza­tion and nu­mer­i­cal sim­u­la­tion for streak­ing FEL elec­trons with dif­fer­ent pho­ton en­er­gies will be pre­sented. High rep­e­ti­tion rate di­ag­nos­tic re­quire­ments and so­lu­tions will also be dis­cussed.  
 
THA02 Experimental Characterization of FEL Polarization Control with Cross Polarized Undulators 644
 
  • E. Ferrari, E. Allaria, G. De Ninno, B. Diviacco, D. Gauthier, L. Giannessi, G. Penco, C. Spezzani
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • J. Buck, M. Ilchen
    XFEL. EU, Hamburg, Germany
  • G. De Ninno, D. Gauthier
    University of Nova Gorica, Nova Gorica, Slovenia
  • L. Giannessi
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • Z. Huang, A.A. Lutman
    SLAC, Menlo Park, California, USA
  • G. Lambert, B. Mahieu
    LOA, Palaiseau, France
  • J. Viefhaus
    DESY, Hamburg, Germany
  
  Po­lar­iza­tion con­trol of the co­her­ent ra­di­a­tion is be­com­ing an im­por­tant fea­ture of re­cent and fu­ture short wave­length free elec­tron laser fa­cil­i­ties. While po­lar­iza­tion tun­ing can be achieved tak­ing ad­van­tage of spe­cially de­signed un­du­la­tors, a scheme based on two con­sec­u­tive un­du­la­tors emit­ting or­thog­o­nally po­lar­ized fields has also been pro­posed. De­vel­oped ini­tially in syn­chro­tron ra­di­a­tion sources, crossed po­lar­ized un­du­la­tor schemes could ben­e­fit from the co­her­ent emis­sion that char­ac­ter­ize FELs. In this work we re­port the first de­tailed ex­per­i­men­tal char­ac­ter­i­za­tion of the po­lar­iza­tion prop­er­ties of an FEL op­er­ated with crossed po­lar­ized un­du­la­tors in the Soft-X-Rays. As­pects con­cern­ing the av­er­age de­gree of po­lar­iza­tion and the shot to shot sta­bil­ity are in­ves­ti­gated to­gether with a com­par­i­son of the per­for­mance of var­i­ous schemes to con­trol and switch the po­lar­iza­tion  
slides icon Slides THA02 [5.383 MB]