Study of a diamond channel cut monochromator for high repetition rate operation at the EuXFEL: FEA thermal load simulations and first experimental results

The recent start of the European X-ray Free-Electron Laser (EuXFEL) provides a unique pulsed X-ray source of high spectral brilliance and high photon flux at a high repetition rate and opens the possibility for new scientific opportunities. However, the EuXFEL beam has a high peak power that is conv...

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Bibliographic Details
Published in:Journal of physics. Conference series 2022-12, Vol.2380 (1), p.12053
Main Authors: Tasca, K R, Petrov, I, Deiter, C, Martyushov, S, Polyakov, S, Rodriguez-Fernandez, A, Shayduk, R, Sinn, H, Terentyev, S, Vannoni, M, Zholudev, S, Samoylova, L
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
Cyclic loads
Design parameters
Diamonds
Finite element method
Free electron lasers
Monochromators
Optical components
Physics
Repetition
Simulation
Single crystals
Thermal analysis
Thermal simulation
X ray sources
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Summary:The recent start of the European X-ray Free-Electron Laser (EuXFEL) provides a unique pulsed X-ray source of high spectral brilliance and high photon flux at a high repetition rate and opens the possibility for new scientific opportunities. However, the EuXFEL beam has a high peak power that is converted into a high cyclic thermal load on the optical elements, such as mirrors and monochromators, and is impossible to fully mitigate within the pulse train pattern. In the single crystal based X-ray monochromators, the increase of temperature leads to deformation of the crystal structure which affects the rocking curve and consequently the performance of these devices and the quality of the transmitted X-ray beam. To address the increase of temperature, we propose the use of a diamond channel-cut monochromator as an alternative to the current silicon monochromators. In this work we present the design and parameters of the diamond monochromator, heat load simulations and the surface and crystalline quality characterisation. The heat load simulations indicate a high performance of the monochromator under the pulse train of the EuXFEL and the characterisation demonstrates high crystal quality and its functionality as a double crystal monochromator.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2380/1/012053