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

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arxiv physics/0409048 v1 pith:MOHOMASM submitted 2004-09-09 physics.ins-det hep-ex

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

M. Campbell , M. Chefdeville , P. Colas , A.P. Colijn , A. Fornaini , Y. Giomataris , H. van der Graaf , E.H.M Heijne
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P. Kluit X. Llopart J. Schmitz J. Timmermans J.L. Visschers
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classification physics.ins-det hep-ex
keywords chipelectronelectronsmeansmedipix2multiplicationreadoutsingle
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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 $\mu$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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