TY  - CONF
AU  - Paetzold, Torsten
AU  - Petersen, Bernd
AU  - Schnautz, Tobias
AU  - Ueresin, Can
AU  - Zajac, Juliusz
TI  - First Operation of the XFEL Linac with the 2 K Cryogenic System
M1  - PUBDB-2017-13933
SP  - 8
PY  - 2017
AB  - 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.
T2  - 2017 Cryogenic Engineering Conference and International Cryogenic Materials Conference
CY  - 9 Jul 2017 - 13 Jul 2017, Madison (USA)
Y2  - 9 Jul 2017 - 13 Jul 2017
M2  - Madison, USA
LB  - PUB:(DE-HGF)8
DO  - DOI:10.3204/PUBDB-2017-13933
UR  - https://bib-pubdb1.desy.de/record/398358
ER  -