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[H27-08]

_______________________________________________ # MAMIYA.Hiroaki@nims.go.jp, *Present affiliation: Japan Atomic Energy Agency

Improvement of Mini-Focusing Small-Angle Neutron Scattering Instrument By Using A High-Performance Neutron Focusing Mirror And Nano-Structure Characterization in Metals

#, A), B), B), C), *, D), E) D), C), A),

F), F), G), C), C), Hiroaki Mamiya#, A), Shin TakedaB), Yutaka YamagataB), Toshinori IshidaC) , Yojiro Oba*, D), Takeshi

FujiwaraE), Masaaki SugiyamaD), Masato OhnumaC), Takahito OhmuraA), Takayuki KumadaF), Daisuke YamaguchiF), Mitsuhiro ShibayamaG) , Hirotaka SatoC), , Michihiro FurusakaC)

A) National Institute for Materials Science B) RIKEN

C) Faculty of Engineering, Hokkaido University D) KURRI, Kyoto University

E) National Institute of Advanced Industrial Science and Technology (AIST) E) Japan Atomic Energy Agency

F) ISSP, Tokyo University

Abstract A prototype of mini-focusing small-angle neutron scattering instrument (mfSANS) had been installed at JRR-3 of

Japan Atomic Energy Agency, JAEA, just before the Great East Japan Earthquake. JRR-3 has been suspended operation since then and we are preparing for the restart. Before the earthquake, small-angle neutron scattering (SANS) in steel and other samples were measured by the instrument. Because of imperfection of the focusing mirror, the data quality was not satisfactory, therefore, we have been developing a focusing mirror based on metal substrate. The quality of the new focusing mirror has improved very much as was characterized at J-PARC/BL06. We also successfully measured SANS in polystyrene latex of the diameter of 75 nm in D2O at Hokkaido University neutron source (HUNS) using the focusing SANS prototype with the ellipsoidal focusing mirror coated with 3 Qc supermirror.

Keyword: neutron ellipsoidal focusing mirror, focusing small-angle neutron scattering instrument

1 1.1

SANS1-2

SANS

mfSANSJAEA JRR-3

2010 Fig. 1 2011

Figure 1. Mini-focusing small-angle scattering instrument (mfSANS) at the guide hall of the JRR-3 reactor.

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[ ]

SANS pin-hole SANS, PHSANSQmin ≈ several×0.01

nm-1

10m

0.5 1 nm 10mm

1/10

PHSANS 10mm

2 mfSANS 2.1

∆λ/λ≈10%

1 mfSANS

Si

135 0.58 nm

∆λ/λ≤1%∆λ/λ

0.5mm Si R=0.75mSi

2.2 mfSANS mfSANS Fig. 2.

1mm48 LPSD

2.3 mfSANS

Fig. 3. JRR-3 PHSANS

SANS-J Q ≤ 0.2 nm-1

Fig. 4.

2.4

[1], [2] Al

NiP 100 µm

0.3 nm RMS

3Qc

Figure 3. Small-angle neutron scattering in steel samples. The curves show those obtained by SANS-J and markers by mfSANS.

Figure 2. A small-angle scintillation detector at the center and a wide-angle detector bank consisting of position sensitive detector modules.

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[ ]

2.5

J-PARC/BL06HUNS

4 1mm1mm

2.6 HUNS HUNS

Fig. 3. 75 nm

2mm1 kW

J-PARC 1 HUNS

3 JRR-3

HUNSPHSANS Qmin ≈ 0.03 nm-1

[1] S. Takeda, Y. Yamagata, N. L. Yamada, M. Hino, T.

Hosobata, J. Guo, S. Morita, T. Oda, M. Furusaka, "Development of a large plano-elliptical neutron- focusing supermirror with metallic substrates.", OPTICS EXPRESS 24(12), 11 (2016).

[2] S. Takeda, J. Guo, S. Morita, H. Ono, T. Oda, J. K ato, H. Sato, M. Hino, Y. Yamagata, M. Furusaka, "Development of highly-mechanically polished metal-substrate for neutron supermirrors." Journal of Physics: Conference Series 528 012011 (2014).

Figure 4. Focused beam spot measured with the old mfSANS instrument. Note that the beam spot is blurred especially in vertical direction.

Figure 5. Beam spot measured by the new 3 Qc focusing mirror. The beam definition pinhole was 1 mmϕ.

Figure 3. Small-angle neutron scattering in steel samples. The curves show those obtained by SANS-J and markers by mfSANS.