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Figure 2
Top: ratio of the equilibrium horizontal emittance of existing third-generation synchrotron light sources over the diffraction-limit value, at three undulator radiation wavelengths defined by the parameters in the legend (see also Table 1[link]). The three wavelengths at the beam energy of 3 GeV are λ = 74 nm (blue), 10 nm (red) and 2 nm (green). Bottom: equilibrium horizontal emittance of a 500 m-circumference synchrotron light source based on a DBA lattice re-scaled with the number of dipoles per cell over the same circumference, and with energy (red lines). The undulator wavelengths defined above versus beam energy are superimposed (blue lines).

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