Author/Authors :
Attié، نويسنده , , D. and Campbell، نويسنده , , M. and Chefdeville، نويسنده , , M. and Colas، نويسنده , , P. and Delagnes، نويسنده , , E. and Giomataris، نويسنده , , Y. and van der Graaf، نويسنده , , H. and Llopart، نويسنده , , X. and Timmermans، نويسنده , , J. and Visschers، نويسنده , , J.، نويسنده ,
Abstract :
We report on the status of the R&D for a digital Time Projection Chamber (TPC) based on Micromegas (MICRO MEsh GAseous Structure) detectors using the CMOS chip TimePix as a direct readout anode protected by highly resistive a-Si:H layer. A small chamber was built as a demonstrator of the 2-D and 3-D imaging capabilities of this technique. We illustrate the new capabilities of this detector for X-ray observation with data taken from radioactive sources. This small TPC is a very useful tool both for studying gas properties thanks to its good efficiency for single electrons, and for reconstructing photoelectron direction for use as a soft X-ray polarimeter.
Keywords :
Polarimeters , X-ray detectors , Gas-filled counters , Diffusion in gases , Electronic circuits , Photolithography , microelectronics , Photon counting and statistics
