Author: Saegebarth, S.
Paper Title Page
TUPO028 Retreatment of European XFEL Series Cavities at DESY as Part of the Repair of European XFEL Accelerating Modules 384
 
  • S. Sievers, N. Krupka, D. Reschke, S. Saegebarth, J. Schaffran, M. Schalwat, P. Schilling, M. Schmökel, N. Steinhau-Kühl, E. Vogel, H. Weise, B. van der Horst
    DESY, Hamburg, Germany
  • M. Wiencek
    IFJ-PAN, Kraków, Poland
  
  For the Eu­ro­pean XFEL 102 ac­cel­er­at­ing mod­ules were built and tested. Sev­eral ac­cel­er­at­ing mod­ules had to be re­worked due to dif­fer­ent kinds of non-con­for­mi­ties. The ex­tent of this re­work var­ied greatly. At the end of pro­duc­tion four ac­cel­er­at­ing mod­ules could not be qual­i­fied in time be­fore the tun­nel in­stal­la­tion was to be fin­ished in Sep­tem­ber 2016. Mean­while the cav­ity strings of two of these ac­cel­er­at­ing mod­ules have been dis­as­sem­bled in the DESY clean room. The cav­i­ties have been re­treated at DESY ei­ther by ad­di­tional high pres­sure water rins­ing or BCP flash chem­i­cal treat­ment. All cav­i­ties were ver­ti­cally tested and 15 out of 16 were qual­i­fied for the re­assem­bly of the cav­ity strings. One ac­cel­er­at­ing mod­ule will be re­assem­bled com­pletely and tested until the end of 2018; the other will fol­low in the first half of 2019. We re­port on re­treat­ment pro­ce­dures and per­for­mance of these cav­i­ties.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO028  
About • paper received ※ 11 September 2018       paper accepted ※ 21 September 2018       issue date ※ 18 January 2019  
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