Development and application of a $^3$He Neutron Spin Filter at J-PARC
Abstract
We are developing a neutron polarizer with polarized He gas, referred to as a He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A He gas-filling station was constructed at J-PARC, and several He cells with long spin relaxation times have been fabricated using the gas-filling station. A laboratory has been prepared in the MLF beam hall for polarizing He cells, and compact pumping systems with laser powers of 30~W and 110~W, which can be installed onto a neutron beamline, have been developed. A He polarization of 85% was achieved at a neutron beamline by using the pumping system with the 110~W laser. Recently, the first user experiment utilizing the He spin filter was conducted, and there have been several more since then. The development and utilization of He spin filters at MLF of J-PARC are reported.
Keywords
Cite
@article{arxiv.2005.14399,
title = {Development and application of a $^3$He Neutron Spin Filter at J-PARC},
author = {T. Okudaira and T. Oku and T. Ino and H. Hayashida and H. Kira and K. Sakai and K. Hiroi and S. Takahashi and K. Aizawa and H. Endo and S. Endo and M. Hino and K. Hirota and T. Honda and K. Ikeda and K. Kakurai and W. Kambara and M. Kitaguchi and T. Oda and H. Ohshita and T. Otomo and H. M. Shimizu and T. Shinohara and J. Suzuki and T. Yamamoto},
journal= {arXiv preprint arXiv:2005.14399},
year = {2020}
}
Comments
9 pages, 15 figures