Browsing by Author "Resnati, Filippo"

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    Charge transfer properties through graphene layers in gas detectors
    (IEEE, 2014) Thuiner, Patrik; Hall-Wilton, Richard John; Jackman, Richard B.; Müller, Hans; Nguyen, Thuong Thuong; Oliveri, Eraldo; Pfeiffer, Dorothea Andreas; Resnati, Filippo; Ropelewski, Leszek; Smith, J. A.; Van Stenis, Miranda; Veenhof, Robert J.; Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Fizik Bölümü.
    Graphene is a single layer of carbon atoms arranged in a honeycomb lattice with remarkable mechanical, electrical and optical properties. For the first time graphene layers suspended on copper meshes were installed into a gas detector equipped with a gaseous electron multiplier. Measurements of low energy electron and ion transfer through graphene were conducted. In this paper we describe the sample preparation for suspended graphene layers, the testing procedures and we discuss the preliminary results followed by a prospect of further applications.
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    Live event reconstruction in an optically read out GEM-based TPC
    (Elsevier, 2017-12-27) Brunbauer, Florian Maximilian; Galgóczi, Gábor; Oliveri, Eraldo; Resnati, Filippo; Ropelewski, Leszek; Streli, Christina; Thuiner, Patrik; Van Stenis, Miranda; Díaz, Diego González; Uludağ Üniversitesi.; 0000-0002-6809-5996; K-7265-2014; 6507842627
    Combining strong signal amplification made possible by Gaseous Electron Multipliers (GEMs) with the high spatial resolution provided by optical readout, highly performing radiation detectors can be realized. An optically read out GEM-based Time Projection Chamber (TPC) is presented. The device permits 3D track reconstruction by combining the 2D projections obtained with a CCD camera with timing information from a photomultiplier tube. Owing to the intuitive 2D representation of the tracks in the images and to automated control, data acquisition and event reconstruction algorithms, the optically read out TPC permits live display of reconstructed tracks in three dimensions. An Ar/CF4 (80/20%) gas mixture was used to maximize scintillation yield in the visible wavelength region matching the quantum efficiency of the camera. The device is integrated in a UHV-grade vessel allowing for precise control of the gas composition and purity. Long term studies in sealed mode operation revealed a minor decrease in the scintillation light intensity.