Open AccessCryo‐cooled silicon crystal monochromators: a study of power load, temperature and deformation
Author(s) -
Khosroabadi Hossein,
Alianelli Lucia,
Porter Daniel G.,
Collins Steve,
Sawhney Kawal
Publication year - 2022
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s160057752200039x
Subject(s) - monochromator , synchrotron , deformation (meteorology) , materials science , finite element method , optics , synchrotron radiation , monocrystalline silicon , crystal (programming language) , power (physics) , silicon , mechanical engineering , physics , optoelectronics , composite material , computer science , thermodynamics , engineering , wavelength , programming language
Crystal monochromators are often the primary optics in hard X‐ray synchrotron beamlines. Management of power load is central to their design. Strict requirements on stability and deformation are to be met, as new‐generation synchrotron sources deliver brighter beams of X‐rays. This article sets out to illustrate an overall picture of the deformation caused by heat load in a cryo‐cooled Si crystal monochromator using first principles. A theoretical model has been developed to predict the temperature distribution and surface deformation by applying intrinsic properties of Si material and the cooling system parameters. The model explains the universal behaviour of crystal slope error versus absorbed power; it has been benchmarked against experimental data and used to interpret finite‐element analysis of cryogenically cooled crystals.