Fig. 7: Undulator beam images.
From: The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility
Monochromatic beam images of a 1.6 m long, U35 undulator source (35 mm period) with deflection parameter K = 2.293, recorded on beamline ID15A at 40.4 keV (15th harmonic), 69.9 keV (26th harmonic) and 99.5 keV (37th harmonic). The images were recorded at a distance of 65 m with a PCO-edge camera coupled to a 2× optics and a LuAG:Ce scintillator. The image pixel size is 3.18 μm pixel. The central disks are the main harmonics (e.g., the 15th harmonic at 40 keV) and the rings are higher-order harmonics (e.g., the 16th harmonic at 40 keV).
