3He spin filter based polarized neutron capability at the NIST Center for Neutron Research

Ncnr 2004 Nist Center for Neutron Research

2005 NIST Center for Neutron Research

The Double Crystal Analyzer Linkage (DXAL) is one of 20 being installed in the Multi-Axis Crystal Spectrometer (MACS). Visible are two curved panels holding pyrolytic graphite crystals and collimating blades between them. The design features a single mechanical linkage that allows rotation of each crystal panel by 2θ and each blade by θ while maintaining parallel entering and exiting beam paths...

Polarized 3He Spin Filters for Slow Neutron Physics

Polarized (3)He spin filters are needed for a variety of experiments with slow neutrons. Their demonstrated utility for highly accurate determination of neutron polarization are critical to the next generation of betadecay correlation coefficient measurements. In addition, they are broadband devices that can polarize large area and high divergence neutron beams with little gamma-ray background,...

Neutron beam effects on spin-exchange-polarized 3He.

We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal spin-exchange-polarized 3He cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable 3He polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation o...

NCNR 2004 NIST CENTER FOR NEUTRON RESEARCH Accomplishments and Opportunities