Development of polarized He neutron spin filters, 3

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki   ; Suzuki, Junichi; Nakamura, Mitsutaka   ; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu  ; Wakimoto, Shuichi  ; Yamazaki, Dai  ; Koizumi, Satoshi; Arimoto, Yasushi*; Ino, Takashi*; Shimizu, Hirohiko*; Kamiyama, Takashi; Oyama, Kenji*; Hiraka, Haruhiro*; Yamada, Kazuyoshi*

Polarized neutron scattering is a powerful technique in order to clarify the magnetic structure of materials. The technique is often used in JRR-3 nowadays. However, the available energy has been limited below 100 meV as long as we use the conventional polarizing method. To realize polarized neutron scattering experiments above the energy, the use of He spin filters is the best solution. In addition, in the new pulsed neutron facility, J-PARC, the neutron source has wide energy spectrum. To polarize all the neutrons, it is desired to use the He spin filters. Taking these backgrounds into account, we are now planning to introduce He neutron spin filters to polarized neutron experiments at JRR-3 and J-PARC. In our oral presentation, we report the detailed plan of the experiments and the present status of the preparation.