Mr. François Perrin Profile

François Perrin

at ESRF - The European Synchrotron

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Publications (5)

Proceedings Article | 3 October 2023 Presentation + Paper

Surface figure correction using differential deposition of WSi2

Ch. Morawe, P. Bras, S. Labouré, F. Perrin, A. Vivo

Proceedings Volume 12694, 1269405 (2023) https://doi.org/10.1117/12.2676633

KEYWORDS: Film thickness, Mirrors, Mirror surfaces, Coating stress, Silicon, Metrology, X-rays, Sputter deposition, X-ray optics, Thin film deposition

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Proceedings Article | 7 June 2023 Presentation + Paper

Differential deposition applied to x-ray mirror substrates

Patrice Bras, Sylvain Labouré, Amparo Vivo, François Perrin, Christian Morawe

Proceedings Volume 12576, 1257607 (2023) https://doi.org/10.1117/12.2665823

KEYWORDS: Reflection, X-rays, Mirrors, Mirror surfaces, X-ray optics, Particles, Optical surfaces, Metrology, X-ray characterization

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Proceedings Article | 21 September 2021 Presentation + Paper

Mirror figure correction on variable length scales

Ch. Morawe, P. Bras, S. Labouré, F. Perrin, A. Vivo

Proceedings Volume 11837, 118370C (2021) https://doi.org/10.1117/12.2595034

KEYWORDS: Platinum, Mirrors, X-rays, X-ray optics, Chromium, Metrology, Thin film coatings, Surface roughness, Silicon, Reflectivity

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Proceedings Article | 9 September 2019 Presentation + Paper

Differential deposition for figure correction of x-ray mirrors

Ch. Morawe, S. Labouré, J-Ch. Peffen, F. Perrin, A. Vivo, R. Barrett

Proceedings Volume 11108, 1110807 (2019) https://doi.org/10.1117/12.2528750

KEYWORDS: Chromium, Mirrors, X-rays, Surface roughness, Reflectivity, X-ray optics, Metrology, Thin film coatings, Interferometers, Scanning electron microscopy

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Proceedings Article | 10 July 2018 Presentation + Paper

Topological design of lightweight additively manufactured mirrors for space

Carolyn Atkins, Charlotte Feldman, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Emmanuel Hugot, Mat Beardsley, Michael Harris, Christopher Spindloe, Simon Alcock, Ioana-Theodora Nistea, Christian Morawe, François Perrin

Proceedings Volume 10706, 107060I (2018) https://doi.org/10.1117/12.2313353

KEYWORDS: Mirrors, Polishing, Surface roughness, Additive manufacturing, Finite element methods, Space mirrors, Aluminum, Single point diamond turning, Lightweight mirrors, Error analysis, 3D printing

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Additive manufacturing (AM), more commonly known as 3D printing, is a commercially established technology for rapid prototyping and fabrication of bespoke intricate parts. To date, research quality mirror prototypes are being trialled using additive manufacturing, where a high quality reflective surface is created in a post-processing step. One advantage of additive manufacturing for mirror fabrication is the ease to lightweight the structure: the design is no longer confined by traditional machining (mill, drill and lathe) and optimised/innovative structures can be used. The end applications of lightweight AM mirrors are broad; the motivation behind this research is low mass mirrors for space-based astronomical or Earth Observation imaging. An example of a potential application could be within nano-satellites, where volume and mass limits are critical. The research presented in this paper highlights the early stage experimental development in AM mirrors and the future innovative designs which could be applied using AM.

The surface roughness on a diamond-turned AM aluminium (AlSi₁₀Mg) mirror is presented which demonstrates the ability to achieve an average roughness of ~3.6nm root mean square (RMS) measured over a 3 x 3 grid. A Fourier transform of the roughness data is shown which deconvolves the roughness into contributions from the diamond-turning tooling and the AM build layers. In addition, two nickel phosphorus (NiP) coated AlSi₁₀Mg AM mirrors are compared in terms of surface form error; one mirror has a generic sandwich lightweight design at 44% the mass of a solid equivalent, prior to coating and the second mirror was lightweighted further using the finite element analysis tool topology optimisation. The surface form error indicates an improvement in peak-to-valley (PV) from 323nm to 204nm and in RMS from 83nm to 31nm for the generic and optimised lightweighting respectively while demonstrating a weight reduction between the samples of 18%. The paper concludes with a discussion of the breadth of AM design that could be applied to mirror lightweighting in the future, in particular, topology optimisation, tessellating polyhedrons and Voronoi cells are presented.

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