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Figure 4
Spectral brightness for PETRA IV (blue, green and red curves) in comparison with PETRA III (black curves) for a ring current of 100 mA. For the soft X-ray spectrum, the brightness is compared for a 5 m UE65 undulator that is currently installed at beamline P04 at PETRA III. In the hard X-ray range, the comparison is made for a 5 m U29 undulator installed at P10. The full lines correspond to the high-brightness/high-coherence mode, and the dashed lines to the timing mode. In the high-energy X-ray range, significant gains in brightness can be achieved with a U18 undulator, i.e. a 5 m device in a regular ID section (green curve) and a 10 m device in one of the four long straight sections with optimized electron beam parameters.

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