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, P. Kluit, X. Llopart, J. Schmitz, J. Timmermans, J. L. Visschers
Abstract
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 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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