Article Title

A large area polarized He-3 neutron spin filter

Type of Work

Article

Date

5-11-2007

Journal Title

Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment

Journal ISSN

0168-9002

Journal Volume

574

Journal Issue

3

First Page

500

Last Page

509

DOI

10.1016/j.nima.2007.02.091

Abstract

A large area polarized He-3 neutron spin filter has been developed and tested in long-term operation. The polarizer cells have area 50 cm(2) and larger allowing access to a large area neutron beam. Polarization of He-3 up to 57 +/- 1% was measured by monitoring the neutron transmission through the He-3. The polarization was maintained over the course of several weeks, but the maximum attainable polarization declined over the course of a year-long run as the cell degraded, possibly due to long-term exposure to the neutron beam at high temperatures. The resulting neutron polarization and transmission are velocity dependent and are optimized for 5 angstrom. Cell construction, polarizer design, performance, and polarimetry are described in this paper. (C) 2007 Published by Elsevier B.V.

Hamilton Areas of Study

Physics