Fig. 1. Optimization schematic of the source-size broadening on the Rowland circle

Fig. 2. Design of the multi-Rowland-circle bent surface. (a) Multi-Rowland-circle structure; (b) position distribution of source, curved crystal, and detector

Fig. 3. Diffraction focusing images at different detector positions. (a) Detector deviates from ideal position by -200 mm; (b) detector deviates from ideal position by -100 mm; (c) detector deviates from ideal position by -50 mm; (d) detector is at ideal position; (e) detector deviates from ideal position by +100 mm; (f) detector deviates from ideal position by +200 mm

Fig. 4. Diffraction focusing images of multi-energy radiant source. (a) Multi-energy point diffraction focusing simulation image; (b) normalized intensity in Z-axis direction

Fig. 5. Diffraction focusing images at different source sizes. (a) Radius of light source is 0.5 mm; (b) radius of light source is 1.0 mm; (c) radius of light source is 5.0 mm

Fig. 6. Impact trend of source-size broadening on spectral resolving power

Fig. 7. Multi-Rowland-circle curved crystal component

Fig. 8. Configuration of the multi-Rowland-circle bent crystal spectral focusing experiment. (a) Overall configuration; (b) actual experiment configuration

Fig. 9. Results of the multi-Rowland-circle bent crystal spectral focusing experiment. (a) Detector deviates from ideal position by +150 mm; (b) detector deviates from ideal position by +100 mm; (c) detector deviates from ideal position by +50 mm; (d) detector is at ideal position; (e) detector deviates from ideal position by -100 mm; (f) detector deviates from ideal position by -150 mm

Fig. 10. Distribution of spectral intensity and energy