Properties of the dispersive double bent crystal monochromator setting with a multicrystal sandwich at the place of the second axis

0556877 - ÚJF 2023 RIV NL eng J - Článek v odborném periodiku
Mikula, Pavol - Šaroun, Jan - Strunz, Pavel - Ryukhtin, Vasil
Properties of the dispersive double bent crystal monochromator setting with a multicrystal sandwich at the place of the second axis.
Journal of Neutron Reasearch. Roč. 24, č. 1 (2022), s. 1-14. ISSN 1023-8166
Grant CEP: GA MŠMT LM2018111; GA MŠMT EF16_013/0001794
Grant ostatní: AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Výzkumná infrastruktura: CANAM II - 90056; Reactors LVR-15 and LR-0 II - 90120
Institucionální podpora: RVO:61389005
Klíčová slova: Neutron diffraction * dispersive monochromator * bent-perfect crystal * focusing * powder diffraction
Obor OECD: Nuclear related engineering
Impakt faktor: 1.1, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.3233/JNR-210032

In this paper, some luminosity, focusing and resolution properties of a double-crystal (n,-m) dispersive setting which contains a bent perfect Si(111) crystal as a first one and a sandwich consisting of four different bent perfect crystals (BPC) Si(220), Si(400), Ge(111) and Ge(311) located at the second axis, is introduced with the aim of possible use in high-resolution diffractometry. The properties were investigated at a neutron wavelength of 0.162 nm. It was shown that a narrow and highly collimated and high-resolution monochromatic beam can be obtained. By using a standard polycrystalline pin of alpha-Fe, the resolution of the three-axis diffraction performance, namely, in the vicinity of the scattering angle 20(S) = 90 degrees was tested in detail. It has been found that the dispersive double-crystal (DC) setting represents a high-resolution monochromator alternative, e.g. in powder diffraction which could be used at high-flux neutron sources.
Trvalý link: http://hdl.handle.net/11104/0330991