We have measured the absolute radiant flux of synchrotron radiation as a function of the angle above and below the orbital plane with high accuracy at the Synchrotron Ultraviolet Radiation Facility (SURF III) and the results were compared with theoretical calculation. The radiant flux of synchrotron radiation were measured at effective wavelengths of 256.5 nm, 397.8 nm, and 799.8 nm using three calibrated narrowband filter radiometers with electron energies ranging from 180 MeV to 380 MeV at SURF III. The filter radiometers were positioned inside a beamline with an unobstructed view of synchrotron radiation. The measured radiant flux agrees with theoretical Schwinger formulation to within 0.5 % for angles up to several milliradians.
Citation: Physical Review A (Atomic, Molecular and Optical Physics)
Pub Type: Journals
absolute radiant flux, angular distribution, filter radiometer, synchrotron radiation