Contribution to a conference proceedings

PUBDB-2017-13933

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png First Operation of the XFEL Linac with the 2 K Cryogenic System

Paetzold, T.DESY* ; Petersen, B.DESY* ; Schnautz, T. (Corresponding author)DESY* ; Ueresin, C.Extern* ; Zajac, J.DESY*

2017

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Please use a persistent id in citations: doi:10.3204/PUBDB-2017-13933

Abstract: 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.

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Contributing Institute(s):

1. Kryogenik und Supraleitung (MKS)

Research Program(s):

1. 6G13 - XFEL (POF3-622) (POF3-622)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2017

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Database coverage:

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