At present, the storage ring DORIS III (4.5 GeV, 150 mA) serves as the main source for synchrotron radiation experiments at DESY. DORIS III is a second generation storage ring with a rather large emittance of 404 nmrad, thus producing high flux X-ray beams of comparatively low brilliance. In order to follow the increasing user request for high brilliance beams, DESY will rebuild the storage ring PETRA into a very low emittance synchrotron radiation source called PETRA III. PETRA (positron electron tandem ring accelerator) is a storage ring with 2.304 km circumference, which was built in 1976 as an e+ - e− collider. Currently PETRA is used as a pre-accelerator for the proton-lepton collider HERA. In parallel it also serves one undulator beamline in parasitic mode.
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Franz et al. (2006) studied this question.