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Report No.

Current status and future plan of a $$^{3}$$He spin filter development

Oku, Takayuki  ; Sakai, Kenji ; Hiroi, Kosuke ; Watanabe, Masao ; Shinohara, Takenao  ; Aizawa, Kazuya ; Kakurai, Kazuhisa; Kira, Hiroshi*; Hayashida, Hirotoshi*; Kiriyama, Koji*; Suzuki, Junichi*; Ino, Takashi*; Okawara, Manabu*; Noda, Yohei*; Oyama, Kenji*; Okudaira, Takuya*; Okada, Anju*; Kitaguchi, Masaaki*; Shimizu, Hirohiko*; Lee, W. T.*; Xin, T.*

We have been developing a $$^{3}$$He neutron spin filter for applicaion at J-PARC MLF. The $$^{3}$$He neutron spin filter is avairable for neutrons in a wide energy range, and is also effective for a divergent neutron beam. Therefore, it is very useful in the neutron scattering experiment. So far, we have devleoped a compact laser optics with a volume holographic grating (VHG) elements, and have constructed an on-beam SEOP based $$^{3}$$He neutron spin filter. The olarization analysis tests were performed with the $$^{3}$$He neutron spin filter at several neutron beamlines for the sans, reflectivity and neutron imaging experiments. To extend the application range of the $$^{3}$$He neutron spin filter at J-PARC MLF, we plan to develop larger saize cells, higher power laser for the SEOP, and prepare working area for the filter inside the MLF experimental hall.



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