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Development and application of an in-situ SEOP $$^{3}$$He neutron spin filter

Oku, Takayuki   ; Hayashida, Hirotoshi; Sakai, Kenji ; Shinohara, Takenao   ; Nakamura, Mitsutaka   ; Aizawa, Kazuya  ; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Kira, Hiroshi*; Sakaguchi, Yoshifumi*; Suzuki, Junichi*; Ino, Takashi*; Hiraka, Haruhiro*; Shimizu, Hirohiko*; Okawara, Manabu*; Oyama, Kenji*

We have been developing an in-situ SEOP $$^{3}$$He neutron spin filter to apply it to pulsed neutron experiments at J-PARC/MLF. To introduce the $$^{3}$$He neutron spin filter into the instruments of the pulsed neutron facility such as J-PARC/MLF, it is important to make the system compact and stable, because the system is located inside thick and bulky radiation shields for high energy $$gamma$$ ray and neutrons. In this study, we have developed a compact laser optics with a volume holographic grating (VHG) element, and composed an in-situ SEOP $$^{3}$$He neutron spin filter. We have started to apply the $$^{3}$$He spin filer as an analyzer to polarized neutron small angle scattering and reflection measurements. A magnetic field imaging are also being tested with the two $$^{3}$$He neutron spin filter cells which are polarized by the ex-situ SEOP technique. In this paper, we report the design of our SEOP $$^{3}$$He neutron spin filter system and some results of the related polarized neutron beam experiments.

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