Author/Authors :
Melai، نويسنده , , Joost and Breskin، نويسنده , , Amos and Cortesi، نويسنده , , Marco and Bilevych، نويسنده , , Yevgen and Fransen، نويسنده , , Martin and van der Graaf، نويسنده , , Harry and Visschers، نويسنده , , Jan and Blanco Carballo، نويسنده , , Victor and Salm، نويسنده , , Cora and Schmitz، نويسنده , , Jurriaan، نويسنده ,
Abstract :
This article presents a detector system consisting of three components, a CMOS imaging array, a gaseous-detector structure with a Micromegas layout, and a UV-photon sensitive CsI reflective photocathode. All three elements have been monolithically integrated using simple post-processing steps. The Micromegas structure and the CMOS imaging chip are not impacted by the CsI deposition. The detector operated reliably in He/isobutane mixtures and attained charge gains with single photons up to a level of 6 × 104. The Timepix CMOS array permitted high resolution imaging of single UV-photons. The system has an MTF50 of 0.4 lp/pixel which corresponds to approximately 7 lp/mm.
Keywords :
UV-photon detection , Micromegas , InGrid , CsI photocathode , CMOS post-processing , Gaseous radiation detector
