The optical and the power characteristics of various synchrotron radiation sources are summarized. The optical characteristics-flux, brightness, coherence, polarization, etc-determine the quality of the source for photon experiments. The power characteristics determine the heat load on beam-line elements. After discussing the cases of the bending magnet, wiggler, and undulator, the case of the helical undulator is considered separately, emphasizing its different power characteristics from the planar case.
Kwang Je Kim, Kwang Je Kim,
"Optical and power characteristics of synchrotron radiation sources [also Erratum 34(4)1243(Apr1995)]," Optical Engineering 34(2), (1 February 1995). https://doi.org/10.1117/12.194193