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![[Figure 2]](xl5030fig2mag.jpg)
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Figure 2
Demonstration of the various resolving power dependences A1–A4 on the magnification Mc provided by the pre-mirror, at three typical spacings d (distance in between the pre-mirror and the grating); each of A1–A4 are grouped into similar colours. The common parameters for each case are: L = 30 m, λ = 5 nm, σs = 50 µm (r.m.s), α = 89°, D0 = 24000 lines cm−1. A1 (blue) is constant at about 170000; A2 (green) would enhance the resolution only when Mc < 0.3 (with respected to A1); A3 (yellow) cannot improve the resolution for any possible value of Mc; A4 (red) can enhance the resolution as long as |Mc| < 1, where the region −0.3 < Mc < 0 (or 0 < Mc < 0.3 for A2) within the two purple dashed lines corresponds to extremely high resolution. However, the optical aberration for the pre-diverging (focusing) mirror could be unacceptably high. A4 is a preferable solution to enhance the resolving power when |Mc| < 1 but not too small. |
![[Figure 2]](xl5030fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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