Comparison of double crystal (+n,-m) and (+n,+m) settings containing a fully asymmetric diffraction geometry of a bent perfect crystal with the output beam expansion

6th European Conference on Neutron Scattering

Mikula, P.^1 ; Vrána, M.^1 ; Šaroun, J.^1 ; Woo, W.^2 ; Em, V.^3 ; apek, J.^4 ; Korytár, D.^5

Nuclear Physics Institute ASCR, V.v.i., Rez

25068, Czech Republic^1

Neutron Science Division, Korea Atomic Energy Research Institute, 1045 Daedok daero, Yuseong-gu, Daejeon

305-353, Korea, Republic of^2

National Research Centre kurchatov Institute, Moscow

123182, Russia^3

Faculty of Math. and Physics, Charles University, Prague, Czech Republic^4

Institue of Physics SAS, Dubravská cesta 9, Bratislava

845 11, Slovakia^5

关键词: Beam expansion;    Bent perfect crystals;    Diffracted beams;    Diffraction property;    Double crystals;    Large cross-sections;    Monochromatic beam;    Phase-contrast radiography;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012029/pdf
DOI  :  10.1088/1742-6596/746/1/012029

来源: IOP

【 摘 要 】

In this paper neutron diffraction properties of the dispersive double crystal (+n,-m) and (+n,+m) settings containing the bent perfect crystal Si(220) in symmetric diffraction geometry and the bent perfect crystal Si(311) in the fully asymmetric diffraction geometry with the output beam expansion are studied and compared. It has been found that the properties, namely, the width of the output double diffracted beam, of both settings strongly depends on the relative combination of curvatures of Si(311) crystal slab with respect to the curvature of the Si(220) one. Moreover, after the beam expansion the fully asymmetric diffraction geometry provides in both cases a highly collimated and highly monochromatic beam of a rather large cross-section of several square centimetres. Application possibilities, of such a beam, namely for neutron phase contrast radiography will be discussed.