"Grating Echo" instrument for small-angle neutron scattering investigations

TL;DR

This paper introduces a novel small-angle neutron scattering instrument utilizing absorption gratings to enhance measurement capabilities, based on a prototype demonstrated with optical radiation and theoretical modeling.

Contribution

It presents the concept, design parameters, and theoretical framework for a grating echo instrument for neutron scattering, advancing small-angle neutron scattering techniques.

Findings

Derived equations for radiation transmission and scattering functions.

Presented design limitations and parameters for neutron absorption gratings.

Outlined expected performance and experimental potential of the instrument.

Abstract

The concept of the instrument with absorption gratings into small-angle neutron scattering measuring is discussed. The instrument action consists of passing direct and scattered radiation through a system of 3 absorption gratings, consisting of periodic transparent and absorbing strips. The instrument operates in a mode of geometric optics. The principle of operation of the instrument is demonstrated on a prototype created for optical radiation. For the instrument equations of the radiation transmission and the display of the sample, scattering function has been derived. The necessary parameters of neutron absorption gratings and design limitations of the installation are given. By the concept of "grating echo instrument for neutron scattering", the expected characteristics and experimental possibilities are presented.