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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

Published online by Cambridge University Press:  19 March 2019

P. Mikula ,
M. Vrana ,
J. Saroun ,
J. Stammers  and
V. Em
P. Mikula*
Affiliation:
Neutron Physics Department, Nuclear Physics Institute, ASCR v.v.i, Rez, Czech Republic
M. Vrana
Affiliation:
Neutron Physics Department, Nuclear Physics Institute, ASCR v.v.i, Rez, Czech Republic
J. Saroun
Affiliation:
Neutron Physics Department, Nuclear Physics Institute, ASCR v.v.i, Rez, Czech Republic
J. Stammers
Affiliation:
Neutron Physics Department, Nuclear Physics Institute, ASCR v.v.i, Rez, Czech Republic
V. Em
Affiliation:
National Research Centre “Kurchatov Institute”, Moscow, Russian Federation
*
a)Author to whom correspondence should be addressed. Electronic mail: mikula@ujf.cas.cz
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Abstract

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 α-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 (Δd/d)-scale was obtained for the Si(111) + Si(311) double crystal monochromator in the parallel as well as in the antiparallel diffraction geometry.

Keywords

Neutron diffractiondispersive monochromator settingbent perfect crystalneutron optics
Type
Technical Articles
Information
Powder Diffraction , Volume 34 , Supplement S1 , September 2019 , pp. S18 - S22
Copyright
Copyright © International Centre for Diffraction Data 2019 

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