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    Calorimetric Measurements with Extremely Fine Spatial Resolution
    (IEEE, 2016) Bilki, Burak; Freund, Benjamin; Repond, Jose
    In special tests, the active layers of the CALICE Digital Hadron Calorimeter prototype, the DHCAL, were exposed to low energy particle beams, without being interleaved by absorber plates. The thickness of each layer corresponded approximately to 0.29 radiation lengths or 0.034 nuclear interaction lengths, defined mostly by the copper and steel skins of the detector cassettes. With its extremely fine segmentation of the readout based on 1 x 1 cm(2) pads, the DHCAL provides unprecedented details of both electromagnetic and hadronic showers. This paper reports on measurements performed with this device in the Fermilab test beam with positrons in the energy range of 1 to 10 GeV. The measurements are compared to simulations based on GEANT4 and a standalone program to emulate the detailed response of the active elements.
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    Construction and Testing of Novel Designs of Resistive Plate Chambers
    (IEEE, 2018) Bilki, Burak; Onel, Yasar; Repond, Jose; Xia, Lei
    Resistive Plate Chambers (RPCs) exhibit a significant loss of efficiency for the detection of particles, when subjected to high particle fluxes. This rate limitation is related to the usually high resistivity of the resistive plates used in their construction. Here we report on the measurements of the performance of various different glass RPC designs featuring a different total resistance of the resistive plates. In parallel, a novel design of RPC, using only a single resistive plate, was developed and tested. Based on this design, large size prototype chambers were constructed and were tested with cosmic rays and in particle beams. The tests confirmed the viability of this new approach.