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

被引：0

作者：

Khosroabadi, Hossein ^{[1
]}

Alianelli, Lucia ^{[1
]}

Sanchez-Navarro, Pablo ^{[2
]}

Peach, Andrew ^{[1
]}

Sawhney, Kawal ^{[1
]}

机构：

[1] Diamond Light Source, Harwell Sci & Innovation Campus, Didcot OX11 0DE, Oxon, England

[2] MAX IV Lab, Fotongatan 2, S-22484 Lund, Sweden

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2024年 / 31卷

关键词：

cryo-cooled Si monochromator; deformation modelling; threshold power; sweet spot; cooling design; WAVE-FRONT-PRESERVATION; SILICON MONOCHROMATORS; PERFORMANCE LIMITS;

D O I：

10.1107/S1600577524002133

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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.

引用

页码：478 / 484

页数：7