Актуальные проблемы в машиностроении. Том 12. № 3-4. 2025 Технологическое оборудование, оснастка и инструменты ____________________________________________________________________ 55 KEY FEATURES OF THE DESIGN OF A DOUBLE-CRYSTAL MONOCHROMATOR Skeeba V.Y., Ph.D. (Engineering), Associate Professor, e-mail: skeeba_vadim@mail.ru Yanpolskiy V.V., Ph.D. (Engineering), Associate Professor, e-mail: yanpolskiy@corp.nstu.ru Rozhnov E.E., Post-graduate Student, email: rozhnov.2017@stud.nstu.ru Yulusov I.S., Post-graduate Student, email: yulusov.2017@stud.nstu.ru Papko S.S., Post-graduate Student, email: papko.2017@stud.nstu.ru Popkov A.S., Post-graduate Student, email: popkov.2016@stud.nstu.ru Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation Abstract The paper presents a stage in the development of a double-crystal monochromator (DCM) scientific instrument. The basic requirements for the device and its elements are specified. An analysis of the surface roughness of the working surfaces of a pair of water-cooled Si crystals with a (111) working plane orientation is conducted. The operating principle of the double-crystal monochromator and the main synchrotron radiation beam control element — a fine-tuning mechanism for controlling the crystals — are described. The developed device allows isolating the required energy range for the experiment from the synchrotron radiation (SR) beam incident on the crystals. During the development process, key technical challenges were identified, including the need to ensure ultra-high vacuum (UHV), precision crystal alignment, and maintaining a stable temperature of the working surfaces. Keywords Synchrotron radiation, monochromatic beam, double-crystal monochromator, Bragg angle.
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