The DEPFET Active Pixel Sensor as Vertex Detector for the ILC

Physics – Medical Physics

Scientific paper

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Ilc, Vertex Detector, Tracker, Depfet

Scientific paper

Large matrices of DEPFET sensors are a promising technology for the ILC Vertex Detector. Pulse-cleared MOS-based DEPFET pixels of ≈ 25 μm × 25 μm size are arranged in modules with an active area of ≈ 1.3 cm × 10 cm. This part can be as thin as 50 μm. A thicker silicon frame provides stability for a self-supporting module. The readout is performed by sequentially addressing pixel rows with analog multiplexer chips located at the module edge and by digitizing the drain currents with specialized readout chips at a rate of several 10 MHz. This concept can provide a low mass tracker with low power dissipation in the active area and with good radiation tolerance.

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