Metrology and quality assurance for European XFEL long flat mirrors installation

Idoia Freijo Martín; Maurizio Vannoni; Harald Sinn

doi:10.1117/12.2270312

26 June 2017 Metrology and quality assurance for European XFEL long flat mirrors installation

Idoia Freijo Martín, Maurizio Vannoni, Harald Sinn

Proceedings Volume 10330, Modeling Aspects in Optical Metrology VI; 1033007 (2017) https://doi.org/10.1117/12.2270312
Event: SPIE Optical Metrology, 2017, Munich, Germany

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.

Citation Download Citation

Idoia Freijo Martín, Maurizio Vannoni, and Harald Sinn "Metrology and quality assurance for European XFEL long flat mirrors installation", Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 1033007 (26 June 2017); https://doi.org/10.1117/12.2270312

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KEYWORDS

Mirrors

Metrology

Polishing

Cooling systems

Surface finishing

X-rays

Coating

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