Open Accessin-situ 3He SEOP polarizer for Thermal neutrons
Author(s) -
Zahir Salhi,
E. Babcock,
Kendal Bingöl,
Klaus Bussmann,
H. Kämmerling,
V. Ossovyi,
Achim Heynen,
Hao Deng,
Vladimir Hutanu,
S. Masalovich,
Jörg Voigt,
A. Ioffe
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1316/1/012009
Subject(s) - polarizer , neutron , optics , polarization (electrochemistry) , materials science , neutron temperature , neutron radiation , physics , spectrometer , nuclear physics , chemistry , birefringence
In this article, we describe a neutron polarizer for a new time-of-flight neutron spectrometer with the polarization analysis TOPAS. This instrument will use the convergent focused incoming beam of thermal neutrons with energies up to 150 meV (wavelength down to 0.74Å). The polarizer employs a high opacity 3 He neutron spin filter with continuous 3 He polarization provided by two laser array bars frequency narrowed by an ultra-compact volume Bragg grating. The system was successfully prototyped, and tested. In the course of first experimental test at the polarized hot neutron diffractometer POLI at MLZ, neutron polarization of 97.6% was achieved for 0.895Å neutrons and kept constant during 30 days.