A sagittally confined high-resolution spectrometer in the `water window'

Li, Z.; Li, B.

doi:10.1107/S160057751800468X

Figure 3
Schematic diagrams to illustrate the light source with different object distances in its meridional (gray) or sagittal (yellow) coordinates, achieving the identical image focal length in the two directions. (a) Both the meridional and sagittal object distances are real (i.e. $[{{r}}_{{\rm m}}\,\gt\,{0}]$ and $[{{r}}_{{\rm s}}\,\gt\,{0}]$ ). (d) The meridional object distance is real, while the sagittal object distance is virtual (i.e. $[{{r}}_{{\rm m}}\,\gt\,{0}]$ and $[{{r}}_{{\rm s}}\,\lt\,{0}]$ ). The symbols S_m or i_m represent the meridional object (or image) point, while S_s or i_s represent the sagittal object (or image) point. The optimal meridional focal curve (red spots) is presented in each diagram (b, c, e and f) as the control group, where r_m = 1000 cm, $[{r_{20}^{\,\prime}}{(}{{\lambda }}_{{0}}{)}={200}]$ cm (at the center wavelength), and the other parameters are the same as those for the optimal case in Fig. 1

(R = 52729 cm). The sagittal focal curves for various cases are presented in specific plots for comparison. (b) The sagittal focal curves for r_s = infinity, $[{\rho }={28}]$ cm and r_s = 40 m, $[{ \rho }={27}]$ cm. (c) The sagittal focal curve for r_s = 10 m, $[{\rho }={23}]$ cm and r_s = 5 m, $[{\rho }={21}]$ cm. (e) The sagittal focus curves for fixing r_s = -200 cm while changing $[{\rho }]$ . (f) The sagittal focus curves for fixing $[{\rho }={800}]$ cm while changing r_s.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 25| Part 3| May 2018| Pages 738-747

https://doi.org/10.1107/S160057751800468X

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