The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit

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A small drift chamber was read out by means of a MediPix2 readout chip as direct anode. A micromegas foil was placed 50 µm above the chip, and electron multiplication occured in the gap. With a He/Isobutane 80/20 mixture, gas multiplication factors up to tens of thousands were achieved, resulting in...

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Detalles Bibliográficos
Autores principales: Campbell, M, Chefdeville, M, Colas, P, Colijn, A P, Fornaini, A, Giomataris, Ioanis, van der Graaf, H, Heijne, Erik H M, Kluit, P, Llopart-Cudie, Xavier, Schmitz, J, Timmermans, J, Visschers, J L
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/811080
Descripción
Sumario:A small drift chamber was read out by means of a MediPix2 readout chip as direct anode. A micromegas foil was placed 50 µm above the chip, and electron multiplication occured 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 δ-rays. Keywords: Micromegas, MediPix2, TPC, single electron, pixel, pixel segmented anode

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