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Campbell, M.; Chefdeville, M.; Colas, P.; Colijn, A.P.; Fornaini, A.; Giomataris, Y.; van der Graaf, H.; Heijne, E.H.M.; Kluit, P.; Llopart, X.; Schmitz, J.; Timmermans, J.; Visschers, J.L.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 03/2005, Letnik: 540, Številka: 2Journal Article
A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50 μ 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 δ -rays.
