etc, PETRA III: A New High Brilliance Synchrotron Radiation Source at DESY, this conference

DESY has decided to rebuild its 2304 m long accelerator PETRA II into a dedicated light source called PETRA III. The reconstruction is planned to start mid 2007. The new light source will operate at an energy of 6 GeV, a current of 100 mA, a horizontal emittance of 1 nmrad and an emittance coupling of 1%. In the first phase thirteen insertion devices are foreseen. In this paper the principle layout of the machine will be presented. The structure of the new machine combines properties of conventional storage rings and light sources and is therefore quite unconventional. One of the major challenges of the project is to achieve the small emittances. The basic idea is to use so called damping wigglers with a total length of 80 m to reduce the horizontal emittance to the desired level. To obtain and maintain the small emittances imposes tight tolerances on spurious dispersion and orbit quality and stability. These limits will be given and discussed. OVERVIEW In order to meet the future demands for synchrotron radiation at DESY it has been decided to convert the existing storage ring PETRA II into a dedicated light source [1]. Since PETRA II has a comparatively large circumference of 2304 m the new light source PETRA III should be compatible with the exiting high energy light sources such as APS, ESRF and Spring 8. The basic design parameters of PETRA III are given in Table 1