Design study of magnetic environments for XYZ polarization analysis using 3He for the new thermal time of flight spectrometer TOPAS

TL;DR

This paper presents a finite element magnetic field analysis for a new polarization analysis device using 3He neutron spin filters, aimed at integrating XYZ polarization analysis into the TOPAS spectrometer.

Contribution

It introduces a novel magnetic environment design using the PASTIS Coil and 3He NSF for enhanced polarization analysis in a new spectrometer.

Findings

Finite element calculations validate the magnetic field design.

The PASTIS Coil effectively creates the desired magnetic environment.

The design supports large-angle neutron polarization analysis.

Abstract

We present a finite element calculation of the magnetic field (MagNet software) taken with the newly proposed PASTIS Coil, which uses a wide-angle banana shaped 3He Neuton Spin Filter cell (NSF) to cover a large range of scattering angle. The goal of this insert is to enable XYZ polarization analysis to be installed on the future thermal time-of flight spectrometer TOPAS.