Abstract :
The GridPix detector consists of a pixel chip with an electron multiplication stage. It is sensitive for single electrons, created in an ionising event in the gas-filled (drift) space. Tipsy is a new pixelised photon sensor in which each pixel is equipped with some 5 dynodes. Given the small pixel source capacitance, all soft photons are measured individually with an unprecedented spatial- and time resolution (10 micron, 1 ps, resp).