Development and application of a 3He Neutron Spin Filter at J-PARC
Development and application of a 3He Neutron Spin Filter at J-PARC
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J-PARC 3He 中子旋转过滤器的开发和应用
DOI：
10.1016/j.nima.2020.164301
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yamamoto T.
中科院分区：
文献类型：
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作者：
Okudaira T.;Oku T.;Ino T.;Hayashida H.;Kira H.;Sakai K.;Hiroi K.;Takahashi S.;Aizawa K.;Endo H.;Endo S.;Hino M.;Hirota K.;Honda T.;Ikeda K.;Kakurai K.;Kambara W.;Kitaguchi M.;Oda T.;Ohshita H.;Otomo T.;Shimizu H.M.;Shinohara T.;Suzuki J.;Yamamoto T.
我们正在开发一种基于自旋交换光抽运（SEOP）的极化中子散射实验的极化3 He气体的中子极化器，称为3 He自旋过滤器。在J-PARC建立了一个3 He充气站，并利用该充气站制作了几个具有长自旋弛豫时间的3 He电池。已在MLF束大厅准备了一个实验室，用于极化3 He室，并开发了可安装在中子束线上的激光功率为30 W和110 W的紧凑型泵浦系统。利用110 W激光泵浦系统，在中子束线上获得了85%的3 He极化。最近，进行了第一次使用3 He自旋过滤器的用户实验，此后又进行了几次。本文报道了在日本PARC的MLF装置上研制和使用3 He自旋过滤器的情况。
We are developing a neutron polarizer with polarized 3 He gas, referred to as a 3 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 3 He gas-filling station was constructed at J-PARC, and several 3 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 3 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 3 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 3 He spin filter was conducted, and there have been several more since then. The development and utilization of 3 He spin filters at MLF of J-PARC are reported.