The upgrade programme for the ESRF accelerator control system

To reach the goals specified in the ESRF Upgrade Programme, for the new experiments to be built, the storage ring needs to be modified. The optics must be changed to allow up to seven meter long straight sections and canted undulator set-ups. Better beam stabilization and feedback systems are necessary for the nano-focus experiments planned. Also we are undergoing a renovation and modernization phase to increase the lifetime of the accelerator and its control system. This paper resumes the major upgrade projects, such as the new beam position monitoring (BPM) system, the fast orbit feedback, the ultra-small vertical emittance and their implications on the control system. Ongoing modernization projects such as the solid state radio frequency amplifier or the high-order mode (HOM) damped cavities are described. Software upgrades of several sub-systems e.g. vacuum and insertion devices, which are planned either for this year or for the long shutdown period, beginning of 2012, are covered as well. The final goal is to move to a Tango only control system. (authors)