High-heat-load monochromator options for the RIXS beamline at the APS with the MBA lattice

Liu, Zunping; Gög, T.; Stoupin, Stanislav; Upton, M. H.; Ding, Yang; Kim, Jung Ho; Casa, D.; Said, Ayman; Carter, Jason A.; Navrotski, Gary

doi:10.1063/1.4952918

Cited by 1 publication

(2 citation statements)

References 5 publications

(6 reference statements)

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“…In an earlier study an analytical model was developed (Khosroabadi et al, 2022), which describes the universal behaviour of cryocooled Si deformation and the transition between concave, flat and convex regimes. The results from the model agree both with available experimental data (Lee et al, 2001;Khosroabadi et al, 2022) and FEA data (Zhang et al, 2013(Zhang et al, , 2023Huang & Bilderback, 2012;Huang et al, 2014;Liu et al, 2016).…”

Section: Introductionsupporting

confidence: 84%

“…Increased beam brightness and collimation in new low-emittance synchrotron machines is driving progress to further control deformation and stability of double-crystal monochromators (DCMs). The optics cooling is constantly evaluated with the aim of improving the thermal response to photon beams with higher power (Brumund et al, 2021;Chumakov et al, 2014;Liu et al, 2016;Petrov et al, 2022;Zhang et al, 2023;Liang et al, 2018;Rebuffi et al, 2020;Qin et al, 2022;Wu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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

Khosroabadi,

Alianelli,

Sanchez-Navarro

et al. 2024

J Synchrotron Radiat

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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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