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Proceedings Paper

Metrology and quality assurance for European XFEL long flat mirrors installation
Author(s): Idoia Freijo Martín; Maurizio Vannoni; Harald Sinn
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Paper Abstract

The European XFEL is a large-scale user facility under construction in Hamburg, Germany. It will provide a transversally fully coherent X-ray radiation with outstanding characteristics: high repetition rate (up to 2700 pulses with a 0.6 milliseconds long pulse train at 10Hz), short wavelength (down to 0.05 nm), short pulses (in the femtoseconds scale) and high average brilliance (1.6x1025 photons / s / mm2 / mrad2/ 0.1% bandwidth)1. Due to the short wavelength and high pulse energies, mirrors need to have a high-quality surface, have to be very long (1 m), and at the same time an effective cooling system has to be implemented. Matching these tight specifications and assessing them with high precision optical measurements is very challenging.

The mirrors go through a complicated and long process, starting from classical polishing to deterministic polishing, ending with a special coating and a final metrology assessment inside their mechanical mounts just before the installation. The installation itself is also difficult for such big mirrors and needs special care. In this contribution we will explain how we implemented the installation process, how we used the metrology information to optimize the installation procedure and we will show some preliminary results with the first mirrors installed in the European XFEL beam transport.

Paper Details

Date Published: 26 June 2017
PDF: 6 pages
Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 1033007 (26 June 2017); doi: 10.1117/12.2270312
Show Author Affiliations
Idoia Freijo Martín, European XFEL GmbH (Germany)
Maurizio Vannoni, European XFEL GmbH (Germany)
Harald Sinn, European XFEL GmbH (Germany)

Published in SPIE Proceedings Vol. 10330:
Modeling Aspects in Optical Metrology VI
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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