Modelling the power threshold and optimum thermal deformation of indirectly liquid-nitrogen cryo-cooled Si monochromators
(2024) In Journal of Synchrotron Radiation 31(Pt 3). p.478-484- 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... (More)
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.
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- author
- Khosroabadi, Hossein ; Alianelli, Lucia ; Sanchez-Navarro, Pablo LU ; Peach, Andrew and Sawhney, Kawal
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- cooling design, cryo-cooled Si monochromator, deformation modelling, sweet spot, threshold power
- in
- Journal of Synchrotron Radiation
- volume
- 31
- issue
- Pt 3
- pages
- 7 pages
- publisher
- International Union of Crystallography
- external identifiers
-
- pmid:38592970
- scopus:85192431765
- ISSN
- 0909-0495
- DOI
- 10.1107/S1600577524002133
- language
- English
- LU publication?
- yes
- id
- 6de7d45e-d20f-4aee-bdda-9a56570d64d0
- date added to LUP
- 2025-01-10 14:06:43
- date last changed
- 2025-07-12 05:26:54
@article{6de7d45e-d20f-4aee-bdda-9a56570d64d0,
abstract = {{<p>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.</p>}},
author = {{Khosroabadi, Hossein and Alianelli, Lucia and Sanchez-Navarro, Pablo and Peach, Andrew and Sawhney, Kawal}},
issn = {{0909-0495}},
keywords = {{cooling design; cryo-cooled Si monochromator; deformation modelling; sweet spot; threshold power}},
language = {{eng}},
number = {{Pt 3}},
pages = {{478--484}},
publisher = {{International Union of Crystallography}},
series = {{Journal of Synchrotron Radiation}},
title = {{Modelling the power threshold and optimum thermal deformation of indirectly liquid-nitrogen cryo-cooled Si monochromators}},
url = {{http://dx.doi.org/10.1107/S1600577524002133}},
doi = {{10.1107/S1600577524002133}},
volume = {{31}},
year = {{2024}},
}