Author/Authors :
Fornaini، نويسنده , , A. and Campbell، نويسنده , , M. and Chefdeville، نويسنده , , M. and Colas، نويسنده , , P. and Colijn، نويسنده , , A.P. and van der Graaf، نويسنده , , H. and Giomataris، نويسنده , , Y. and Heijne، نويسنده , , E.H.M. and Kluit، نويسنده , , P. and Llopart، نويسنده , , X. and Schmitz، نويسنده , , J. and Timmermans، نويسنده , , J. and Visschers، نويسنده , , J.L.، نويسنده ,
Abstract :
By placing a Micromegas gas gain grid on top of a CMOS pixel readout circuit (MediPix2), we developed a device which acts as a pixel-segmented direct anode in gas-filled detectors.
He/Isobutane 80/20 mixture (capable of achieving gas gain factors up to 20 × 10 3 ) and employing a drift length of 15 mm, signals from radioactive sources and cosmic radiation were measured. Single primary electrons originating from the passage of cosmic muons through the gas volume were detected with an efficiency higher than 90%.
Keywords :
Micromegas , Pixel segmented anode , pixel , CMOS pixel detector , Medipix2 , Single electron detection
