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Surface oxide and roughness on test samples for the Ultra High Vacuum section of the European XFEL
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics.ORCID iD: 0000-0001-9299-3262
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics.
2018 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 149, 83-86 p.Article in journal (Refereed) Published
Abstract [en]

The European X-ray Free Electron Laser has recently started with operation for users. An approximately 3 m long ultra high vacuum laser heater section is implemented to overcome possible electron bunch instabilities. We describe the process of determining the oxide layer thickness and surface roughness on test samples of the internal surface material in the laser heater vacuum chambers using elastic recoil detection analysis and optical surface profiling. The results are compared to specified values and show that surface roughness on the samples is larger than the requested maximum, with RMS deviations from a mean plane of up to 1.76 μm for 0.60 × 0.45 square millimeter scans. The maximum oxide layer thickness is 5.5 nm on non-electropolished surfaces assuming cuprous oxide with density 6.0 g per cubic centimeter and 4.0 nm on electropolished surfaces.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 149, 83-86 p.
Keyword [en]
European XFEL; Laser Heater; Vacuum chambers; Surface roughness; Oxide
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-220878DOI: 10.1016/j.vacuum.2017.12.014Scopus ID: 2-s2.0-85038848192OAI: oai:DiVA.org:kth-220878DiVA: diva2:1171530
Funder
Swedish Research Council, 821-2012-5144; 828-2008-1093Swedish Foundation for Strategic Research , RIF14-0053
Note

QC 20180108

Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08Bibliographically approved

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