**Figure 3**
Ray-tracing results for focal beam images at 12.4 keV in the ideal case using the geometry of BL26B1 and BL26B2 (Fig. 1) with horizontal acceptance angle φ_{H} values of (*a*) 1.5 mrad and (*b*) 0.7 mrad. The vertical acceptance of the incident X-rays, φ_{V}, was set to 30 µrad in both cases. The light source is a 0.679 T bending-magnet source with source electron beam sizes of σ_{x} = 106 µm and σ_{y} = 13 µm and emittances of ∊_{x} = 3.4 × 10^{−9} m rad and ∊_{y} = 6.8 × 10^{−12} m rad (Tanaka & Kitamura, 2001). The sagittal crystal radius of curvature *R*_{s} is 3.71 m. The glancing angle of the tangential-focusing mirror θ_{m} is 3.6 mrad, and the radius of curvature *R*_{m} is 5.27 km. |