Modeling of the focusing device and the elliptical neutron guide for the DN-6 diffractometer at IBR-2 reactor

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 892; pp. 48 - 52
• Main Authors: Belushkin, A.V., Manoshin, S.A., Kozlenko, D.P., Kichanov, S.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018
• Subjects: Elliptic neutron guide; Focusing device; Simulations; Focusing device; Simulations; Elliptic neutron guide
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2018.02.088

Possible options for modernization of the neutron beam forming system of the DN-6 diffractometer for the study of crystal and magnetic structures of microsamples at high pressures are being considered. It was demonstrated that for samples with the cross-section not exceeding 5×5 mm2 the most efficient option would be the use of an elliptical neutron guide. It allows to deliver neutrons for large distances from the source to samples with minimal losses using, as a rule, just one neutron reflection per dimension i.e. one at a side and one at top or bottom. For the present moment due to technical difficulties of such option realization, the simplified solution was proposed. At the end of the curved neutron guide it is planned to install a vertical plane focusing 7-meter-long parabolic section. Such a modernization will increase the neutron flux at the sample by a factor 1.5–3.5 and reduce respectively the typical measurement times. •Elliptical neutron guide shows a very high efficiency for tiny samples(5×5 mm2).•The expected gain in flux(1–4 Å) for the elliptical neutron guide is 20–30.•Parabolic shaped focusing section provides the gain in flux by a factor 1.5–3.5.