New neutron transmission supermirror remanent polarizer

TL;DR

This paper introduces a compact, efficient neutron transmission supermirror remanent polarizer with high transmittance and polarization, suitable for large beams and wide angular distributions, simplifying assembly and operation.

Contribution

It presents a novel design of a neutron polarizer that is compact, easy to assemble, and effective in high magnetic fields, utilizing remanent magnetization in supermirror structures.

Findings

High transmittance for the (-) spin component

Highly polarized output beam

Effective operation with large cross-section beams

Abstract

A new neutron transmission supermirror remanent polarizer is proposed. The polarizer is compact. It consists of two solid state polarizing parts. Parts of the polarizer have antiparallel magnetization of magnetic layers of supermirror structures. Both parts of the polarizer have magnetic remanence. This allows it to be used as a polarizer and analyzer in small magnetic fields. The polarizer can be used when working with beams of large cross-section and with a wide angular distribution. Assembly of the device is greatly simplified, because it is not required to bend a large stack of short plates along the radius, but only to compress of its. The width of the angular profile of the beam passed through the polarizer does not change! The polarizer has a high transmittance for the (-) spin component of the beam. The beam passed through the polarizer is highly polarized. Properties of neutron polarizing CoFe/TiZr and Fe/Si remanent supermirrors (m = 2.0 and 2.5) are discussed. A variant of effective use of the proposed polarizer with a spin-flipper for operation in saturating magnetic fields is proposed.