A Micromegas detector for the CAST experiment

A Micromegas detector has been mounted on the Cern Axion Solar Telescope experiment at CERN. Performance results of the detector, based on the fast period of data taken in November 2002 and in May 2003, are presented. Preliminary results on efficiencies, background rejection and axion sensitivity are shown. A novel pixel Micromegas detector is being developed to be coupled to a focussing X-ray telescope.