Article

Performance of a DEPFET prototype module for the ILC vertex detector

Phys. Inst., Bonn Univ., Germany
IEEE Transactions on Nuclear Science (Impact Factor: 1.46). 07/2006; DOI: 10.1109/TNS.2006.873079
Source: IEEE Xplore

ABSTRACT For the detection of secondary vertices of long lived bottom and charm quarks at the proposed International Linear Collider (ILC) a DEPFET pixel detector is one of the favored technology options. DEPFET pixel sensors, in which the amplifying transistor structure is contained in the pixel cell itself on a fully depleted bulk, are unique devices in terms of their large signal and low noise capability and their obtainable spatial resolution with very thin detectors. DEPFET pixel prototype modules with close to ILC specifications have been tested in the laboratory and, for the first time, in a 6 GeV electron test beam. The different noise sources have been calculated and compared with the measured value of ENC≈225 e- for the entire readout chain.

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    • "The response of DEPFET sensors from the PXD5 and PXD6 production has been characterized in beams of charged particles from accelerators at CERN and DESY [19], [20], [32], [33]. In the following only some highlights from this extensive program are presented. "
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    ABSTRACT: The DEPFET collaboration develops highly granular, ultra-transparent active pixel detectors for high-performance vertex reconstruction at future collider experiments. The characterization of detector prototypes has proven that the key principle, the integration of a first amplification stage in a detector-grade sensor material, can provide a comfortable signal to noise ratio of over 40 for a sensor thickness of 50-75 $\mathrm{\mathbf{\mu m}}$. ASICs have been designed and produced to operate a DEPFET pixel detector with the required read-out speed. A complete detector concept is being developed, including solutions for mechanical support, cooling and services. In this paper the status of DEPFET R & D project is reviewed in the light of the requirements of the vertex detector at a future linear $\mathbf{e^+ e^-}$ collider.
    IEEE Transactions on Nuclear Science 12/2012; 60(2). DOI:10.1109/TNS.2013.2245680 · 1.46 Impact Factor
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    • "These requirements impose unprecedented constraints on the detector: High granularity, fast read-out, low material budget and low power consumption. Measurements on realistic DEPFET prototypes have demonstrated that the concept is one of the principal candidates [3] [4] to meet these challenging requirements. "
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    ABSTRACT: The DEPFET Collaboration pursues the development of a high resolution pixel vertex detector for future colliders (like ILC), based on the integration of amplifying transistors into a fully depleted bulk. In August 2008, six DEPFET prototypes were tested in a pion beam at SPS complex at CERN, collecting more than 20 million of events. In this contribution, the prototype system, the experimental setup, the analysis software and preliminary results are presented.
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    • "The results of the earliest beam test have been reported in previous publications [14] [15] [16]. In 2008 and 2009 the DEPFET collaboration has continued its test beam programme in the SPS H6 beam line (120 GeV pion beams). "
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    ABSTRACT: DEPFET pixels offer a unique possibility for a high resolution pixel vertex detector at a future linear collider (ILC) experiment. The key idea of DEPFET sensors is the integration of amplifying transistors into a fully depleted bulk. The excellent noise performance obtained through the low input capacitance in combination with the full signal from the depleted bulk leads to a large S/N ratio. The sensor itself can therefore be made very thin (50mm) without loss of efficiency. In this article the progress of the DEPFET development towards an ILC vertex detector is presented. Properties of prototype matrices and dedicated ASIC electronics have been characterized in various laboratory and test beam measurements. In particular a point resolution of less than 2 mm has been demonstrated (using 450 mm thick sensors). Based on these results larger matrices, improved readout and control electronics have been designed which are presently in production. In parallel software was developed to simulate the performance of a DEPFET based vertex detector in an ILC experiment.
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