Dispersive double bent crystal monochromators Si(111)+ Si(311) and Si(111)+ Si(400) with a strongly asymmetric diffraction geometry of the analyzer for powder diffractometry

0509708 - ÚJF 2020 RIV US eng J - Journal Article
Mikula, Pavol - Vrána, Miroslav - Šaroun, Jan - Stammers, James H. - Em, V.
Dispersive double bent crystal monochromators Si(111)+ Si(311) and Si(111)+ Si(400) with a strongly asymmetric diffraction geometry of the analyzer for powder diffractometry.
Powder Diffraction. Roč. 34, č. 9 (2019), s. 18-22. ISSN 0885-7156. E-ISSN 1945-7413.
[16th European Powder Diffraction Conference (EPDIC). Edinburgh, 01.07.2018-04.07.2018]
R&D Projects: GA MŠMT LM2015056; GA ČR GC16-08803J; GA MŠMT LM2010011
Institutional support: RVO:61389005
Keywords : neutron diffraction * dispersive monochromator setting * bent perfect crystal
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.919, year: 2019
Method of publishing: Limited access
https://doi.org/10.1017/S0885715619000137

In this paper, some results of neutron diffraction properties of the dispersive double-crystal Si(111) + Si(311) and Si(111) + Si(400) monochromator settings containing two bent perfect crystals but with the second one - analyzer in the strongly asymmetric diffraction geometry, are presented. For the sake of possible applications, both double crystal settings were tested in the orientation of the second crystal for the output beam compression geometry. Powder diffraction test was carried out on a alpha-Fe(211) pin of the diameter of 2 mm. Contrary to the Si(111) + Si(400) setting, an excellent resolution represented by full width at half maximum in the (Delta d/d)-scale was obtained for the Si(111) + Si(311) double crystal monochromator in the parallel as well as in the antiparallel diffraction geometry.
Permanent Link: http://hdl.handle.net/11104/0300358