Detection of single electrons by means of a Micromegas-covered Medi Pix2 pixel CMOS readout circuit

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A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50 mu m above the chip, and electron multiplication occurred in the gap. With a He /isobutane 80/20 mixture, gas multiplication factors up to tens of thousands were achieved, result...

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Detalles Bibliográficos
Autores principales: Campbell, Michael, Chefdeville, Maximilien, Colas, Paul, Colijn, Auke Pieter, Fornaini, Alessandro, Giomataris, Ioanis, Heijne, Erik H M, Kluit, Peter, Llopart-Cudie, Xavier, Schmitz, Jurriaan, Timmermans, J, Visschers, Jan L, Van der Graaf, Harry
Lenguaje:eng
Publicado: 2005
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2004.11.036
http://cds.cern.ch/record/912967
Descripción
Sumario:A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50 mu m above the chip, and electron multiplication occurred in the gap. With a He /isobutane 80/20 mixture, gas multiplication factors up to tens of thousands were achieved, resulting in an efficiency for detecting single electrons of better than 90 %. We recorded many frames containing 2D images with tracks from cosmic muons. Along these tracks, electron clusters were observed, as well as delta -rays.

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