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Modelling the power threshold and optimum thermal deformation of indirectly liquid-nitrogen cryo-cooled Si monochromators

DOI: 10.1107/S1600577524002133 DOI Help

Authors: Hossein Khosroabadi (Diamond Light Source) , Lucia Alianelli (Diamond Light Source) , Pablo Sanchez-Navarro (MAX IV Laboratory) , Andrew Peach (Diamond Light Source) , Kawal Sawhney (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 31

State: Published (Approved)
Published: May 2024

Open Access Open Access

Abstract: Maximizing the performance of crystal monochromators is a key aspect in the design of beamline optics for diffraction-limited synchrotron sources. Temperature and deformation of cryo-cooled crystals, illuminated by high-power beams of X-rays, can be estimated with a purely analytical model. The analysis is based on the thermal properties of cryo-cooled silicon crystals and the cooling geometry. Deformation amplitudes can be obtained, quickly and reliably. In this article the concept of threshold power conditions is introduced and defined analytically. The contribution of parameters such as liquid-nitro­gen cooling efficiency, thermal contact conductance and interface contact area of the crystal with the cooling base is evaluated. The optimal crystal illumination and the base temperature are inferred, which help minimize the optics deformation. The model has been examined using finite-element analysis studies performed for several beamlines of the Diamond-II upgrade.

Diamond Keywords: cryo-cooled Si monochromator; deformation modelling; threshold power; sweet spot; cooling design

Subject Areas: Physics

Technical Areas: Optics

Added On: 11/04/2024 08:39

Journal of Synchrotron Radiation - 2024 - Khosroabadi - Modelling the power threshold and optimum thermal deformation of.pdf

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Optics Physics

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