An integrated readout system for drift chambers: the application of monolithic CMOS pixel sensors as segmented direct anode
- Campbell, M.
- Heijne, E.H.M.
- Llopart, X.
- Chefdeville, M.A.
- Colas, P.
- Giomataris, Y.
- Colijn, A.P.
- Fornaini, A.
- van der Graaf, H.
- Kluit, P.
- Timmermans, J.
- Timmermans, J.
- Visschers, J.L.
- Schmitz, J.
DOIAbstract
A small TPC has been 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 δ-rays
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