Development of micromegas-like gaseous detectors using a pixel readout chip as collecting anode

This thesis reports on the fabrication and test of a pixel readout gaseous detector formed by a Micromegas amplication grid integrated on a CMOS pixel readout chip by microelectronic techniques. This very high granularity low-mass detector called GridPix provides single electron sensitivity and can be fabricated by postprocessing of pixel chip wafers...