Spin exchange optical pumping based polarized 3He filling station for the Hybrid Spectrometer at the Spallation Neutron Source

C. Y. Jiang, X. Tong, D. R. Brown, H. Culbertson, M. K. Graves-Brook, M. E. Hagen, B. Kadron, W. T. Lee, J. L. Robertson, B. Winn

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9 Scopus citations

Abstract

The Hybrid Spectrometer (HYSPEC) is a new direct geometry spectrometer at the Spallation Neutron Source at the Oak Ridge National Laboratory. This instrument is equipped with polarization analysis capability with 60°horizontal and 15°vertical detector coverages. In order to provide wide angle polarization analysis for this instrument, we have designed and built a novel polarized 3He filling station based on the spin exchange optical pumping method. It is designed to supply polarized 3He gas to HYSPEC as a neutron polarization analyzer. In addition, the station can optimize the 3He pressure with respect to the scattered neutron energies. The depolarized 3He gas in the analyzer can be transferred back to the station to be repolarized. We have constructed the prototype filling station. Preliminary tests have been carried out demonstrating the feasibility of the filling station. Here, we report on the design, construction, and the preliminary results of the prototype filling station.

Original languageEnglish
Article number065108
JournalReview of Scientific Instruments
Volume84
Issue number6
DOIs
StatePublished - Jun 2013

Funding

Research at the Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, and the U.S. Department of Energy. We thank Dr. Thomas Gentile at NIST for his thoughtful input. We also thank Professor Mike Snow at the Indiana University for his valuable suggestions.

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