Properties of the Insertion Devices for PETRA III and its Extension

In 2007 and 2008, the PETRA ring at DESY was rebuilt from a booster for HERA to a low emittance synchrotron radiation source, called PETRA III. During the reconstruction for one eighth of the storage ring, the FODO lattice was replaced by nine double bent achromat cells, now accommodating insertion devices for 14 independent beamlines. Besides the 2 m long standard undulators U29 and U32, several special IDs of up to 5 m length have been installed to meet the experimental requests for high energy X-rays, elliptically polarized light, and a higher degree of coherence. This article will give an overview over the key parameters like the spectral properties, the brilliance and the power density of the current undulators installed at PETRA III