Development of a polarized 3He neutron spin filter for POLANO at J-PARC

T Ino; M Ohkawara; K Ohoyama; T Yokoo; S Itoh; Y Nambu; M Fujita; H Kira; H Hayashida; K Hiroi; K Sakai; T Oku; K Kakurai

doi:10.1088/1742-6596/862/1/012011

Journal of Physics: Conference Series

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Development of a polarized ³He neutron spin filter for POLANO at J-PARC

T Ino^1,2,3, M Ohkawara⁴, K Ohoyama⁵, T Yokoo^1,2,3, S Itoh^1,2,3, Y Nambu⁴, M Fujita⁴, H Kira⁶, H Hayashida⁶, K Hiroi^2,7, K Sakai^2,7, T Oku^2,7 and K Kakurai⁶

Published under licence by IOP Publishing Ltd
Journal of Physics: Conference Series, Volume 862, International Conference on Polarised Neutrons for Condensed Matter Investigations (PNCMI 2016) 4–7 July 2016, Munich (Freising), Germany Citation T Ino et al 2017 J. Phys.: Conf. Ser. 862 012011 DOI 10.1088/1742-6596/862/1/012011

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takashi.ino@kek.jp

Author affiliations

¹ Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan

² J-PARC Center, Tokai, Ibaraki 319-1195, Japan

³ SOKENDAI - The Graduate University for Advanced Studies, Tsukuba, Ibaraki 305-0801, Japan

⁴ Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

⁵ Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki316-8511, Japan

⁶ Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan

⁷ Japan Atomic Energy Agency, Tokai, Ibaraki 319-1184, Japan

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Abstract

We have developed a polarized ³He neutron spin filter (NSF) for a new polarized neutron spectrometer, POLANO, at the Japan Proton Accelerator Research Complex (J-PARC). POLANO aims to utilize high energy neutrons polarized by a ³He NSF and spin analyzed by an array of magnetic supermirrors for inelastic neutron scattering. The ³He gas is continuously polarized in-situ by spin-exchange optical pumping to provide a highly and stably polarized neutron beam. The POLANO ³He NSF is designed to polarize neutrons with energies as high as 200 meV and fit in a restricted space. It is equipped with adiabatic fast passage NMR that enables one to flip the ³He spins, and consequently, the neutron spins.

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