%0 Conference Paper
%A Bozhko, Yury
%A Petersen, Bernd
%A Escherich, Kurt
%A Jensch, Kay
%A Schnautz, Tobias
%A Sellmann, Detlef
%T Commissioning and First Cooldown of XFEL Linac
%M PUBDB-2017-12069
%P 8 
%D 2017
%X Beam commissioning of the European X-ray Free Electron Laser (European XFEL project)  is  ongoing.  Commissioning  the  XFEL  cryogenic  system  has  started  by  cooling  down  the  XFEL  injector  section  in  December  2015.  The  stationary  operation  was  continued  until August  2016.  After  intermediate  warming  up  of  the  complete  XFEL  cryogenic  system,  the commissioning of remaining  components  including  the  1.5  km  long  superconducting  XFEL linear accelerator (linac) has commenced and was completed in beginning of December 2016. After  conclusive  pressure  and  leak  tests,  and  flushing  the  cooldown  started  on  11  December 2016. Stable 4.5 K operation both for the linac and injector was established on 28 December. In  this  paper  the  XFEL  cryogenic  system  is  introduced  and the  first cooldown  of  the  XFEL  linac is reported. The cooldown sequences are described and the measured cooldown evolution is  presented.  Thermal  losses  of  single  circuits  are  given.  Preliminary  conclusions  with  the  review of critical points are drawn.
%B 2017 Cryogenic Engineering Conference and International Cryogenic Materials Conference
%C 9 Jul 2017 - 13 Jul 2017, Madison (USA)
Y2 9 Jul 2017 - 13 Jul 2017
M2 Madison, USA
%F PUB:(DE-HGF)8
%9 Contribution to a conference proceedings
%R 10.3204/PUBDB-2017-12069
%U https://bib-pubdb1.desy.de/record/395308