Browsing by Author "Muller, H."

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    Charge transfer properties through graphene for applications in gaseous detectors
    (Elsevier, 2016-07-11) Franchino, S.; Gonzalez-Diaz, Diego; Hall-Wilton, Richard; Jackman, Richard; Muller, H.; Nguyen, T. T.; de Oliveira, R.; Oliveri, Eraldo; Pfeiffer, Dorothea; Resnati, F.; Ropelewski, L.; Smith, Joe; van Stenis, M.; Streli, Christina; Thuiner, P.; Veenhof, Robert J.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 6603742499
    Graphene is a single layer of carbon atoms arranged in a honeycomb lattice with remarkable mechanical and electrical properties. Regarded as the thinnest and narrowest conductive mesh, it has drastically different transmission behaviours when bombarded with electrons and ions in vacuum. This property, if confirmed in gas, may be a definitive solution for the ion back-flow problem in gaseous detectors. In order to ascertain this aspect, graphene layers of dimensions of about 2 x 2 cm(2), grown on a copper substrate, are transferred onto a flat metal surface with holes, so that the graphene layer is freely suspended. The graphene and the support are installed into a gaseous detector equipped with a triple Gaseous Electron Multiplier (GEM), and the transparency properties to electrons and ions are studied in gas as a function of the electric fields. The techniques to produce the graphene samples are described, and we report on preliminary tests of graphene-coated GEMs.
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    Precise timing with the picosec-micromegas detector
    (Soc Italiana Fisica, 2020-01-01) Sampsonidis, D.; Bortfeldt, J.; Brunbauer, F.; David, C.; Desforge, D.; Fanourakis, G.; Franchi, J.; Gallinaro, M.; Garcia, F.; Giomataris, I; Gustavsson, T.; Guyot, C.; Iguaz, F. J.; Kebbiri, M.; Kordas, K.; Lampoudis, C.; Legou, P.; Liu, J.; Lupberger, M.; Maillard, O.; Maniatis, V; Manthos, I; Muller, H.; Oliveri, E.; Papaevangelou, T.; Paraschou, K.; Pomorski, M.; Resnati, F.; Ropelewski, L.; Schneider, T.; Schwemling, P.; Scorsone, E.; Sohl, L.; Van Stenis, M.; Thuiner, P.; Tsipolitis, Y.; Tzamarias, S. E.; Wang, X.; White, S.; Zhang, Z.; Zhou, Y.; Veenhof, R.; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Fizik Bölümü.; GJK-8031-2022
    This work presents the concept of the PICOSEC-Micromegas detector to achieve a time resolution below 30 ps. PICOSEC consists of a two-stage Micromegas detector coupled to a Cherenkov radiator and equipped with a photo-cathode. The results from single-channel prototypes as well as the understanding of the detector in terms of detailed simulations and preliminary results from a multichannel prototype are presented.