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Development of a 3 He nuclear spin flip system on an in-situ SEOP 3 He spin filter and demonstration for a neutron reflectometer and magnetic imaging technique

2016; IOP Publishing; Volume: 711; Linguagem: Inglês

10.1088/1742-6596/711/1/012007

1742-6596

Hirotoshi Hayashida, Takayuki Oku, H. Kira, K. Sakai, Kosuke Hiroi, Takashi Ino, T. Shinohara, T. Imagawa, Manabu Ohkawara, Kenji Ohoyama, Kazuhisa Kakurai, M. Takeda, Dai Yamazaki, Kenichi Oikawa, Masahide Harada, Noboru Miyata, K. Akutsu, Mari Mizusawa, Joseph D. Parker, Yoshihiro Matsumoto, S Zhang, Jun Suzuki, Kazuhiko Soyama, Koki Aizawa, Masatoshi Arai,

Nuclear Physics and Applications

We have been developing a 3He neutron spin filter (NSF) using the spin exchange optical pumping (SEOP) technique. The 3He NSF provides a high-energy polarized neutron beam with large beam size. Moreover the 3He NSF can work as a π-flipper for a polarized neutron beam by flipping the 3He nuclear spin using a nuclear magnetic resonance (NMR) technique. For NMR with the in-situ SEOP technique, the polarization of the laser must be reversed simultaneously because a non-reversed laser reduces the polarization of the spin-flipped 3He. To change the polarity of the laser, a half-wavelength plate was installed. The rotation angle of the half-wavelength plate was optimized, and a polarization of 97% was obtained for the circularly polarized laser. The 3He polarization reached 70% and was stable over one week. A demonstration of the 3He nuclear spin flip system was performed at the polarized neutron reflectometer SHARAKU (BL17) and NOBORU (BL10) at J-PARC. Off-specular measurement from a magnetic Fe/Cr thin film and magnetic imaging of a magnetic steel sheet were performed at BL17 and BL10, respectively.