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Report No.
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Current status and perspectives in the development of an in-situ spin-exchange optical pumping $$^3$$He neutron spin filter at J-PARC

Oku, Takayuki; Kira, Hiroshi*; Hayashida, Hirotoshi*; Sakai, Kenji ; Hiroi, Kosuke; Shinohara, Takenao; Sakaguchi, Yoshifumi*; Ino, Takashi*; Oyama, Kenji*; Nakamura, Mitsutaka; Suzuki, Junichi*; Aizawa, Kazuya; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa

We have been developing a $$^{3}$$He neutron spin filter (NSF) for the efficient utilization of pulsed neutrons, since it can polarize neutrons effectively in a wide energy range. The $$^{3}$$He NSF is effective even for neutrons with energy higher than several-tens-meV, so that it will be useful for the study of high-energy magnetic excitation. Since the $$^{3}$$He NSF can also cover a large solid angle and polarize neutrons without deflecting them from their original course, it is suitable for the analyzer for SANS instruments and reflectometers. In addition, the $$^{3}$$He NSF will be a key device in the application of recently developed magnetic field imaging technique by using polarized pulsed neutrons. In order to apply the $$^{3}$$He NSF to such experiments at a pulsed neutron experimental facility such as the J-PARC, we have developed compact laser optics with a volume holographic grating (VHG) element for a spin-exchange optical pumping (SEOP) system, and composed an in-situ SEOP $$^{3}$$He NSF. Current status in the development and application of the in-situ SEOP $$^{3}$$He NSF at J-PARC will be presented, and perspectives will be discussed.

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