Magnetic-lens-generated polarized neutron beam with enhanced intensity and Q resolution for small-angle neutron scattering

Hiroi, K.; Nakabe, R.; Oku, T.; Kumada, T.; Motokawa, R.

doi:10.1107/S1600576725010246

Figure 7
(a) ΔQ/Q as a function of Q for the loose- and tight-focusing beams and the collimator-shortened non-focusing beam with A_u = 20 mm, ϕ_s = 14 mm and L₂ = 1845 mm. The grey dashed and solid lines correspond to the non-focusing beam with ϕ_s = 8 mm and the focusing beam with ϕ_s = 14 mm, respectively, at L₂ = 10245 mm. The curves were simulated using the experimentally obtained $[\sigma_{\rm r}^2]$ values in Fig. 4

(b) for the non-focusing beam with L₁ = 10100 mm, and for the loose- and tight-focusing beams. For the other beam configurations, the $[\sigma_{\rm r}^2]$ values calculated with equations (2) and (3) were used. (b) SANS profile of the microphase-separated lamellar poly(styrene-b-isoprene) cast film (yellow symbols) obtained using the non-focusing beam with A_u = 20 mm, ϕ_s = 8 mm, L₁ = 10100 mm and L₂ = 5000 mm (Noda et al., 2011

). The plot also shows simulated SANS curves using ΔQ/Q in (a) for the experimental beam (yellow narrow line); the non-focusing beam with A_u = 20 mm, ϕ_s = 14 mm, L₁ = 10100, 5000 and 2000 mm, and L₂ = 1845 mm (dotted, dash–dotted and dashed lines); and the loose- and tight-focusing beams with L₂ = 1845 mm (solid lines), down to where ΔQ/Q = 1. The double-ended purple arrow shows the Q range where signals are hidden by the beam stopper of SANS-J at L₂ = 1845 mm.

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 59| Part 1| February 2026| Pages 69-79

https://doi.org/10.1107/S1600576725010246

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