Development and test of SEOP neutron spin filter in Japan

• Published in: Physica. B, Condensed matter Vol. 406; no. 12; pp. 2433 - 2435
• Main Authors: Kira, H., Sakaguchi, Y., Oku, T., Suzuki, J., Nakamura, M., Arai, M., Kakurai, K., Endo, Y., Arimoto, Y., Ino, T., Shimizu, H.M., Kamiyama, T., Tsutsumi, K., Ohoyama, K., Hiraka, H., Yamada, K., Chang, L.-J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 01-06-2011; Elsevier
• Subjects: Adjustment; Atom and neutron optics; Beams (radiation); Classical and quantum physics: mechanics and fields; Condensed matter; Exact sciences and technology; Matter waves; Neutron beams; Neutron spin filter; Optical pumping; Physics; Polarization; Polarized helium-3; Proton accelerators; Spin exchange optical pumping; Stability; Neutron spin filter; Polarized helium-3; Spin exchange optical pumping; Polarization; Polarized neutron; Helium 3; Spin exchange; Neutron beams; Instrumentation; Optical pumping; Spin filter
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2010.12.019

We have begun the development of an in-situ spin-exchange optical pumping (SEOP) system aiming to use it as a neutron spin filter for incident beam polarization at the Japan Proton Accelerator Research Complex (J-PARC). To use it, it is recommended that the optics be adjusted easily, have high stability, and have a small size. In this paper we improved our previous SEOP system aiming to use it in J-PARC and performed a neutron beam test at the JRR-3 NOP beamline to see the performance of the neutron spin filter (NSF). The polarization of the 3He gas reached 73%. This paper gives the present status of the development of in-situ SEOP system in J-PARC.
► We succeeded in polarizing pulsed neutron beam in J-PARC using our NSF. ► The 3He polarization reached 73%. ► Whole size of our NSF system is compact enough to install it into the instruments.