New gaseous detectors: the application of CMOS pixel chips as direct anode

M. Campbell, E.H.M. Heijne, X. Llopart, M.A. Chefdeville, P. Colas, A. Giganon, Y. Giomataris, A.P. Colijn, A. Fornaini, H. van der Graaf, P. Kluit, J. Timmermans, J.L. Visschers, Jurriaan Schmitz

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    A small Time Projection Chamber (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. Some applications of this new device are presented.
    Original languageUndefined
    Number of pages4
    Publication statusPublished - 16 Oct 2004
    EventIEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2004 - Rome, Italy
    Duration: 16 Oct 200422 Oct 2004


    ConferenceIEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2004
    Abbreviated titleNSS/MIC
    Internet address


    • SC-RID: Radiation Imaging detectors
    • IR-67542
    • EWI-15753

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