Journal Article

PUBDB-2017-01882

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Performance in the vertical test of the 832 nine-cell 1.3 GHz cavities for the European X-ray Free Electron Laser

Reschke, D. (Corresponding author)DESY* ; Gubarev, V.DESY* ; Schaffran, J.DESY* ; Steder, L.DESY* ; Walker, N.DESY* ; Wenskat, M.DESY* ; Monaco, L.INFN*

2017
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevAccelBeams.20.042004  doi:10.3204/PUBDB-2017-01882

Abstract: The successful production and associated vertical testing of over 800 superconducting 1.3 GHz accelerating cavities for the European X-ray Free Electron Laser (XFEL) represents the culmination of over 20 years of superconducting radio-frequency R&D. The cavity production took place at two industrial vendors under the shared responsibility of INFN Milano–LASA and DESY. Average vertical testing rates at DESY exceeded 10 cavities per week, peaking at up to 15 cavities per week. The cavities sent for cryomodule assembly at Commissariat à l’énergie atomique (CEA) Saclay achieved an average maximum gradient of approximately 33  MV/m, reducing to ∼30  MV/m when the operational specifications on quality factor (Q) and field emission were included (the so-called usable gradient). Only 16% of the cavities required an additional surface retreatment to recover their low performance (usable gradient less than 20  MV/m). These cavities were predominantly limited by excessive field emission for which a simple high pressure water rinse (HPR) was sufficient. Approximately 16% of the cavities also received an additional HPR, e.g. due to vacuum problems before or during the tests or other reasons, but these were not directly related to gradient performance. The in-depth statistical analyses presented in this report have revealed several features of the series produced cavities.

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Contributing Institute(s):

1. Forschung Linear Accelerator (FLA)
2. HF-Technik Supraleitung (MHF-sl)
3. Beschleunigerphysik (MPY)
4. Magnetvermessung (MKS 4)
5. Istituto Nazionale di Fisica Nucleare (INFN)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)
2. 6G13 - XFEL (POF3-622) (POF3-622)

Experiment(s):

1. Facility (machine) XFEL
2. Facility (machine) FLASH
3. Facility (machine) ILC

Appears in the scientific report 2017

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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