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Publication Citation: 3He Spin Filter Based Polarized Neutron Capability at the NIST Center for Neutron Research

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Author(s): WangChun Chen; Thomas R. Gentile; Ross W. Erwin; Shannon Watson; Qiang NMN Ye; Kathryn Krycka; Brian B. Maranville;
Title: 3He Spin Filter Based Polarized Neutron Capability at the NIST Center for Neutron Research
Published: July 24, 2014
Abstract: A 3He neutron spin filter (NSF) program for polarized neutron scattering was launched in 2006 as part of the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) Expansion Initiative. The goal of the project was to enhance the NCNR polarized neutron measurements capabilities. Benefitting from more than a decade's development of spin-exchange optical pumping (SEOP) at NIST< we planned to employ SEOP based 3He neutron spin filters for the polarized neutron scattering community. These 3He NSF devices were planned for use on different classes of polarized neutron instrumentation at the NCNR, including triple-axis spectrometers (TAS), small-angle neutron scattering instruments (SANS), reflectometers, and wide-angle polarization analysis. Among them, the BT-7 thermal TAS, NG-3 SANS, and MAGIK reflectometer have already been in the user program for routine polarized beam experiments. Wide-angle polarization analysis on Multi-Axis Crystal Spectrometer (MACS) has been developed for user experiments. We describe briefly the SEOP systems dedicated for polarized beam experiments and polarizing analysis on Multi-Axis Crystal Spectrometer (MACS) has been developed for user experiments. We describe briefly the SEOP systems dedicated for polarized beam experiments and polarizing neutron development for each instrument class. We summarize the current status and polarized neutronic performance for each instrument. We present a 3He NSF hardware and software interface to allow for synchronization of 3He polarization inversion (neutron spin flipping) and free-induction decay (FID) nuclear magnetic resonance (NMR)measurements with neutron data collection.
Conference: Journal of Physics: Conference Series
Volume: 528
Pages: pp. 012014 - 012014
Location: Munich, -1
Dates: July 2-5, 2013
Keywords: polarized neutron, SEOP, 3He NSF
Research Areas: Instrumentation
PDF version: PDF Document Click here to retrieve PDF version of paper (7MB)