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A novel pyrolytic-graphite-on-silicon device for neutron monochromatization
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SYSNO ASEP 0572670 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A novel pyrolytic-graphite-on-silicon device for neutron monochromatization Author(s) Freund, A. (FR)
Chen, C.-Y. (US)
Crosby, M. (US)
Farkas, Gergely (UJF-V) RID, ORCID, SAI
Kozak, B. (US)
Krencisz, D. (US)
Liu, X. (US)
Mikula, Pavol (UJF-V) RID, ORCID, SAINumber of authors 8 Article number 168012 Source Title Nuclear Instruments & Methods in Physics Research Section A. - : Elsevier - ISSN 0168-9002
Roč. 1048, MAR (2023)Number of pages 9 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Neutron monochromators ; Pyrolytic graphite ; Bent perfect crystals ; Dual focusing systems OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects LM2023057 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CICRR - 90241 - Centrum výzkumu Řež s.r.o. Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000994456200001 EID SCOPUS 85163188801 DOI 10.1016/j.nima.2023.168012 Annotation In the quest of improving neutron scattering instrumentation a new style of dynamically focusing monochro-mator is proposed where highly oriented pyrolytic graphite (HOPG) crystals are bonded on bendable single crystal silicon blades. This development followed a study of the elastic limit of HOPG that revealed serious technical difficulties when bending thin blades of this very fragile material to achieve dynamical focusing. The critical breakage thickness was found to be less than 0.1 mm for a radius of curvature of 1.5 m. The novel PG-on-Si (POSI) concept replaces the linear arrays of individually oriented HOPG pieces employed in existing devices. It facilitates the integration of two separate HOPG and Si monochromators into a single device. Mechanical tests, X-ray and neutron diffraction studies of the POSI system confirmed the feasibility of these single and dual monochromator designs that feature high performance and augmented functionality at reduced complexity and cost. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2024 Electronic address https://doi.org/10.1016/j.nima.2023.168012
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