GOSSIP: A vertex detector combining a thin gas layer as signal generator with a CMOS readout pixel array

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

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    13 Citations (Scopus)


    A small TPC has been read out by means of a Medipix2 chip as direct anode. A Micromegas foil was placed 50 mm 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%. With this new readout technology for gas-filled detectors we recorded many image frames containing 2D images with tracks from cosmic muons. Along these tracks, electron clusters were observed, as well as d-rays. With a gas layer thickness of only 1 mm, the device could be applied as vertex detector, outperforming all Si-based detectors.
    Original languageUndefined
    Article number10.1016/j.nima.2005.11.199
    Pages (from-to)131-134
    Number of pages4
    JournalNuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment
    Issue number1
    Publication statusPublished - 23 Dec 2005


    • SC-RID: Radiation Imaging detectors
    • IR-62909
    • METIS-248086
    • EWI-3749

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