Polarized beam operation of the Hybrid Spectrometer at the pulsed Spallation Neutron Source

TL;DR

This paper presents the design and simulation results of a polarization analysis scheme for the HYSPEC neutron spectrometer, demonstrating effective polarized beam operation within specific energy ranges at the Spallation Neutron Source.

Contribution

It introduces a polarization analysis scheme for HYSPEC and evaluates its performance through Monte-Carlo simulations, highlighting its effectiveness for neutron energies up to 25 meV.

Findings

Polarization analysis is effective within 8-10 meV energy window.

Supermirror-bender polarizers provide good polarization performance.

The scheme enables polarized neutron experiments at HYSPEC.

Abstract

The concept of a neutron Hybrid Spectrometer (HYSPEC) combines the time-of-flight spectroscopy with the focusing Bragg optics and incorporates a polarized beam option. Here we describe the polarization analysis scheme proposed for HYSPEC and quantify its performance via the Monte-Carlo simulations. We find that the broadband supermirror-bender transmission polarizers provide reasonably good polarization analysis capability within about 8-10 meV energy window for scattered neutron energies in the thermal range up to about 25 meV.