Author/Authors :
Aphecetche، نويسنده , , L. and Delagrange، نويسنده , , H. and DʹEnterria، نويسنده , , D.G. and Le Guay، نويسنده , , M. and Li، نويسنده , , X. and Martinez Sarriٍn، نويسنده , , G. and Mora، نويسنده , , M.J. and Pichot، نويسنده , , P. and Roy، نويسنده , , D. and Schütz، نويسنده , , Y.، نويسنده ,
Abstract :
The design of a detector based on MICROMEGAS (MICRO MEsh GAseous Structure) technology is presented. Our detector is characterized by a large active area of 398×281 mm2, a pad read-out with 20×22 mm2 segmentation, and an uniform amplification gap obtained by insulating spacers (100 μm high and 200 μm in diameter). The performances of several prototypes have been evaluated under irradiation with secondary beams of 2 GeV/c momentum charged pions and electrons. We consider such a detector as the basic element for a pre-shower detector to equip the PHOton Spectrometer (PHOS) of the ALICE experiment. Its assets are modularity, small amount of material, robustness and low cost.
Keywords :
Gas chamber , direct photons , Micromegas , Micro-pattern detector , Heavy-ion collisions , Tracking detector
