3He Neutron Spin Filter cell development program at JCNS

International Workshop on Neutron Optics and Detectors

Salhi, Z.^1,2 ; Babcock, E.^1 ; Pistel, P.^2 ; Ioffe, A.^1

Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstrasse 1, 85747 Garching, Germany^1

Forschungszentrum Jülich GmbH- Engineering und Technologie (ZEA-1), Wilhelm- Johnen-Strasse, 52425 Julich, Germany^2

关键词: 3He neutron spin filters;    Dipole dipole interactions;    Gas filling;    Glass cell;    High quality;    Life-times;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012015/pdf
DOI  :  10.1088/1742-6596/528/1/012015

来源: IOP

【 摘 要 】

In order to produce high-quality3He Neutron Spin Filters (NSF) with a high polarisation level, it is necessary to achieve a long3He relaxation time by the reduction of the wall relaxation. This requires one to minimise the amount of impurities at the surface of the glass cells, and to have as few contaminants as possible in the gas filling system. In this report we describe the detailed procedure we employ to produce3He cells using our newly built filling station. The obtained life times for a number of cells are practically approaching the fundamental limit imposed by the dipole-dipole interaction between3He atoms.