Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-23T18:45:13.125Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access Rights & Permissions [Opens in a new window]

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Hempel, A., Eichhorn, F., Reichel, P., and Boede, W. (1996). “A neutron double-crystal diffractometer with a position sensitive detector for small-angle scattering studies,” Nucl. Instrum. Methods in Phys. Res. A 381, 466–471.Google Scholar
Kulda, J. (1984). “A novel approach to dynamical neutron diffraction by a deformed crystal,” Acta Crystallogr. Section A 40, 120–126.Google Scholar
Kulda, J., and Mikula, P. (1983). “A medium resolution double crystal diffractometer for SANS studies,” J. Appl. Cryst. 16, 498–504.Google Scholar
Mikula, P., and Vrána, M. (2015). “New type of versatile diffractometer with a double-crystal (DC) monochromator system”, In Proc. of the Int. Conf. EPDIC 14, June 15–18, 2014, Aarhus, Denmark; Powder Diffraction, 30, Suppl. S1, S41–S46.Google Scholar
Mikula, P., Kulda, J., Vrána, M., and Chalupa, B. (1984). “A proposal of a highly efficient double crystal monochromator for thermal neutrons,” J. Appl. Cryst. 17, 189–195.Google Scholar
Mikula, P., Lukáš, P., and Eichhorn, F. (1988). “New version of a medium resolution double-crystal diffractometer for the study of a small angle neutron scattering (SANS),” J. Appl. Crystallogr. 21, 33–37.Google Scholar
Mikula, P., Vrána, M., Šaroun, J., Pilch, J., Seong, B. S., Woo, W., and Em, V. (2014). “Neutron diffraction studies of double crystal (+n,-m) setting containing a fully asymmetric diffraction geometry (FAD) of a bent perfect crystal (BPC) with the output beam expansion (OBE)”, J. Appl. Cryst. 47, Part 2, 599–605.Google Scholar
Mikula, P., Vrána, M., and Korytár, D. (2015). “Observation of edge refraction on a conventional neutron diffractometer employing dispersive double-crystal monochromator,” Physics Procedia. 69, 320–326.Google Scholar
Šaroun, J., and Kulda, J. (2009). “Monte Carlo simulation package RESTRAX 5.2.0 and SIMRES 6.0.6,” June 2009, Available at http://neutron.ujf.cas.cz/restrax/index.php?chap=3/.Google Scholar
Šaroun, J., Lukáš, P., Mikula, P., and Alefeld, B. (1994). “Optimization of a double-bent crystal diffractometer for small-angle neutron scattering experiments,” J. Appl. Crystallogr. 27, 80–88.Google Scholar