%0 Conference Paper
%A Paetzold, Torsten
%A Petersen, Bernd
%A Schnautz, Tobias
%A Ueresin, Can
%A Zajac, Juliusz
%T First Operation of the XFEL Linac with the 2 K Cryogenic System
%M PUBDB-2017-13933
%P 8
%D 2017
%X The RF operation of the about 800 superconducting 1.3 GHz 9-cell cavities of the XFEL linac requires helium II bath cooling at 2 K, corresponding to a vapor pressure of 3100 Pa. After the first cool-down of the XFEL linac to 4 K in December, 27th 2016 the operation of the 2 K cryogenic system was started in January, 2nd 2017. The 2 K cryogenic system consist of a 4-stage set of cold compressors to compress helium vapor at a mass flow of up to 100 g/s from 2400 Pa to about 110 kPa and a full flow bypass with an arrangement of heat exchangers and control valves. This paper describes the XFEL refrigerating plant, especially the 2 K cryogenic system, thetuning of the cold compressor regulation to adapt to the XFEL linac static and dynamicheat loads and experience of about 6 months of operation.
%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-2017-13933
%U https://bib-pubdb1.desy.de/record/398358