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    Detector Seminar

    New results of a Micromegas chamber with a spark-protected TimePix chip as active readout anode

    by van der Graaf , H. (NIKHEF)

    → Europe/Zurich
    13/2-005 (CERN)

    13/2-005

    CERN

    90
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    Description
    The application of CMOS pixel chips as active readout anode in a GEM or Micromegas chamber was prohibited by the destructive, ever-present discharges in gas-filled proportional detectors. A dummy anode has been covered with a 3 micron layer of hydrogenated amorphous silicon. Discharges, induced by alfas from radon, were recorded. The effects of the layer are clear, and are an indication for an adequate protection. A new TimePix chip, developed at CERN, has been covered with this protection layer and was tested in a small TPC. This detector provides 3D images from primary electrons, created in the drift volume, by 55Fe X-ray quanta, cosmic ray muons and 90Sr electrons. Since Dec 19, 2006, the TimePix chip is operational and it has been exposed, up to now, for 40 days.


    Organiser(s): Ariella Cattai
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