Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||Wangchun Chen; Thomas R. Gentile; Ross W. Erwin; Shannon Watson; Qiang 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|
|Pages:||pp. 012014 - 012014|
|Dates:||July 2-5, 2013|
|Keywords:||polarized neutron, SEOP, 3He NSF|
|PDF version:||Click here to retrieve PDF version of paper (7MB)|