Micro in situ3He Polarizer for Dimensional Extreme Magnetic Neutron Diffractometer at the High Flux Isotope Reactor

Chenyang Jiang, Landen McDonald, Huibo Cao, Matthew Balafas, Lowell Crow, Emily Kroll

Research output: Contribution to journalConference articlepeer-review

Abstract

A new micro in situ polarized 3He neutron spin filter has been custom built for use as a neutron polarizer on the Dimensional Extreme Magnetic Neutron Diffractometer (DEMAND) at the High Flux Isotope Reactor (HFIR). The 3He is polarized via spin-exchange optical pumping with a high-power fiber-coupled laser. The 3He neutron spin filter polarizer is designed to be compact in size with the length along the neutron beam only 30 cm because of the limited space available on the beamline. The polarizer is used for the shorter wavelength neutrons (1.005 Å and 1.546 Å) at DEMAND. A 3 bar 3He cell was filled to provide enough opacity so that good neutron polarization can be attained. At DEMAND the polarizer is mounted on an Automated Polarizer Changeover system (APCS) enabling quick switching between polarized and unpolarized neutron diffraction.

Original languageEnglish
Article number012010
JournalJournal of Physics: Conference Series
Volume2481
Issue number1
DOIs
StatePublished - 2023
EventJoint 13th and 14th International Conference on Polarized Neutrons for Condensed Matter Investigations, PNCMI 2022 - Annapolis, United States
Duration: Jul 25 2022Jul 29 2022

Funding

We thank Jason Craig of the ORNL glass shop for making the cell. The use of the High Flux Isotope Reactor at Oak Ridge National Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Scientific User Facilities Division. H.C. acknowledges the support of U.S. DOE BES Early Career Award No. KC0402020 and C.J. acknowledges the support of U.S. DOE BES Early Career Award No. KC0402010, both under Contract DE-AC05-00OR22725.

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