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Current status of the development of the $$^{3}$$He spin filter in JAEA

Okudaira, Takuya; Oku, Takayuki  ; Sakai, Kenji ; Ino, Takashi*; Hayashida, Hirotoshi*; Hiroi, Kosuke ; Shinohara, Takenao  ; Kakurai, Kazuhisa*; Aizawa, Kazuya 

$$^3$$He spin filter is a neutron polarization device composed of polarized $$^3$$He gas and alkali metal encapsulated into a special glass cell. Since a neutron absorption cross section of $$^3$$He has very large spin dependence, a polarized neutron beam for a wide energy range can be obtained passing through the polarized $$^3$$He gas. $$^3$$He nuclei are polarized irradiating a circularly polarized laser, which is referred to as Spin Exchange Optical Pumping method. The development of the $$^3$$He spin filter is ongoing in JAEA. Recently a spin flip technique of $$^3$$He using frequency sweep NMR and a measurement system of $$^3$$He polarization using electron paramagnetic resonance were developed. Additionally, a vacuum system to make $$^3$$He spin filter is also constructed.

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