Author: Choroba, S.
Paper Title Page
MOPO036 Status of the 10 MW MBKs during Commissioning of the European XFEL in DESY 102
MOOP04   use link to see paper's listing under its alternate paper code  
 
  • V. Vogel (Fogel), Ł. Butkowski, A. Cherepenko, S. Choroba, J. Hartung
    DESY, Hamburg, Germany
  
  At pre­sent 26 RF sta­tions for Eu­ro­pean XFEL are in op­er­a­tion. Each of the RF sta­tions con­sists of a HV mod­u­la­tor lo­cated in a sep­a­rate build­ing on the DESY cam­pus, up to 1600 m long 10 kV HV ca­bles that con­nect the mod­u­la­tor and the HV pulse trans­former lo­cated in the un­der­ground tun­nel, 120kV, 3 m long HV cable con­nect­ing the HV pulse trans­former and the con­nec­tion mod­ule of the hor­i­zon­tal multi-beam kly­stron. Two RF sta­tions of the in­jec­tor have al­ready achieved about 20000 hours of op­er­a­tion, RF sta­tions of the XFEL bunch com­pres­sor area have op­er­ated up to 11000 hours and in the XFEL main linac up to 8000 hours. To in­crease the life­time of the kly­strons, we use a fast pro­tec­tion sys­tem (KLM) that is based on the com­par­i­son of the ac­tual RF shape and the ex­pected RF shape. In the case of a dif­fer­ence ex­ceed­ing a cer­tain mar­gin, for ex­am­ple, in the case of RF break­down in a kly­stron or RF break­down in a wave­guide sys­tem, the KLM quickly, shorter than 500 ns, switches off the input RF sig­nal. Thus, it does pre­vents the vac­uum level in the kly­stron worsen too much or it min­i­mizes the RF over­volt­age time at the out­put win­dows of the kly­stron in case of break­down in wave­guides.  
slides icon Slides MOPO036 [5.241 MB]  
poster icon Poster MOPO036 [0.658 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO036  
About • paper received ※ 05 September 2018       paper accepted ※ 19 September 2018       issue date ※ 18 January 2019  
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TUPO027 Series Production of the Specific Waveguide Distribution for the European XFEL at DESY 380
TUPO024   use link to see paper's listing under its alternate paper code  
 
  • B. Yildirim, S. Choroba, V.V. Katalev, P. Morozov, Y. Nachtigal
    DESY, Hamburg, Germany
  • E.M. Apostolov
    Technical University of Sofia, Sofia, Bulgaria
  
  Se­ries Pro­duc­tion of the Spe­cific Wave­guide Dis­tri­b­u­tion for the Eu­ro­pean XFEL at DESY B.​Yildirim, S.​Choroba, V.​Katalev, P.​Morozov, Y.​Nachtigal, E.​Apostolov The Eu­ro­pean XFEL uses 100 ac­cel­er­at­ing cry­omod­ules. One RF sta­tion with 10 MW kly­stron sup­plies four cry­omod­ules, each with eight cav­i­ties, through a wave­guide dis­tri­b­u­tion sys­tem. The RF sta­tion op­er­ates at 1.3 GHz, 1.37 ms pulse width and 10 Hz rep­e­ti­tion rate. The re­sults of the cry­omod­ule test have shown how­ever dif­fer­ent max­i­mum gra­di­ents for each cav­ity. The max­i­mum gra­di­ent has been mea­sured be­tween 11 MV/m and 31 MV/m, which re­quires the cav­ity power from 29 kW to 230 kW. To op­er­ate with the max­i­mum en­ergy for every cry­omod­ule, it is nec­es­sary to sup­ply in­di­vid­ual power to the cav­ity. In this case the weak­est cav­ity prob­lem can be avoided. For this goal a spe­cific wave­guide dis­tri­b­u­tion has been de­vel­oped. 100 wave­guide dis­tri­b­u­tions have been suc­cess­fully tai­lored, pro­duced and tested at the Wave­guide As­sem­bly Test Fa­cil­ity (WATF) at DESY and fi­nally as­sem­bled to the cry­omod­ules. We pre­sent the se­ries pro­duc­tion of the spe­cific wave­guide dis­tri­b­u­tions at the WATF.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO027  
About • paper received ※ 06 September 2018       paper accepted ※ 21 September 2018       issue date ※ 18 January 2019  
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WE1A04 The High Power RF System for the European XFEL 601
 
  • S. Choroba
    DESY, Hamburg, Germany
  
  The pre­sen­ta­tion will be on the de­sign, con­struc­tion and com­mis­sion­ing of the high power RF sys­tem for the Eu­ro­pean XFEL. The RF sys­tem con­sists of 26 high power RF sta­tions each ca­pa­ble of 10MW RF pulse power. It will re­port on the over­all sys­tem lay­out, cover RF sys­tem com­po­nents e.g. kly­strons, mod­u­la­tors and high power RF wave­guide dis­tri­b­u­tion. It will also cover sys­tem mod­i­fi­ca­tions dur­ing con­struc­tion phase and re­port on com­mis­sion­ing re­sults.  
slides icon Slides WE1A04 [12.620 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE1A04  
About • paper received ※ 17 September 2018       paper accepted ※ 20 September 2018       issue date ※ 18 January 2019  
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