Figure 7
Left: plot showing the excellent synchronization between the DCM and undulator energies during a wide energy scan. The red diagonal line is in fact composed of both the DCM and U20 energies, and the blue curve is the difference between them. Right: profile of the third harmonic (undulator gap = 5.5 mm), where the inset shows a zoom-in around the harmonic maximum and the dashed lines around the single data point is the envelope of the difference between the DCM and undulator energies at this position, representing <0.5% maximum intensity variation. |