The potential measurement of particle beam emittance at a third-generation synchrotron radiation facility such as the Advanced Photon Source (APS) by characterizing the observed undulator radiation from an insertion device is considered. The nominal APS particle beam parameters have been used in calculations for insertion devices with periods of λ=3.3 cm, λ=5.0 cm (in two configurations), and λ=1.8 cm. The US program, the MDK1F program, and analytical formulae were used. Sensitivity to variations of emittance by 20% from the nominal value are addressed.
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