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Report No.

Development of a neutron reflectometer SUIREN at JRR-3

Yamazaki, Dai  ; Moriai, Atsushi; Tamura, Itaru  ; Maruyama, Ryuji   ; Ebisawa, Toru*; Takeda, Masayasu  ; Soyama, Kazuhiko  

A new neutron reflectometer "SUIREN" has been developed and started its operation at the research reactor JRR-3 of JAEA in 2006. SUIREN (Apparatus for Surface and Interface investigations with Reflection of Neutrons) provides monochromatic neutron beam with wavelength of 3.8 ${AA}$ and vertical sample geometry, which is suitable for studies on interfaces involving solid layers of soft materials, magnetic materials, neutron mirrors and many other things. Collimated neutron intensity is about 2.1$$times$$10$$^4$$ $$sim$$ 2.6$$times$$10$$^4$$ n/s/cm$$^{2}$$ with =0.08 deg at the sample position. Background is as low as 4.5$$times$$10$$^{-3}$$ n/s when a local beam shutter is closed. A demonstration experiment showed that specular reflectivity of a silicon substrate of 3 inches in diameter can be measured down to 10$$^{-6}$$ over 0 $$<$$ Qz $$<$$ 0.22 ${AA}$ $$^{-1}$$ in 27 hours. This paper describes the beam-line and components of the SUIREN reflectometer, some results of test measurements and future plans.



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