Abstract
The muon telescopes of the Extreme Energy Events (EEE) experiment are based on Multigap Resistive Plate Chambers (MRPC). The EEE network is composed, so far, of 53 telescopes, each made of three MRPC detectors; it is organized in clusters and single telescope stations distributed all over the Italian territory and installed in High Schools, covering an area larger than 3×105 km2. The study of Extensive Air Showers (EAS), that is one of the goal of the project, requires excellent performance in terms of time and spatial resolution, efficiency, tracking capability and long term stability. The data from two recent coordinated data taking periods, named Run 2 and Run 3, have been used to measure these quantities and the results are here reported, together with a comparison with expectations and with the results from a beam test performed in 2006 at CERN.
Highlights
: The muon telescopes of the Extreme Energy Events (EEE) experiment are based on Multigap Resistive Plate Chambers (MRPC)
The EEE network is composed, so far, of 53 telescopes, each made of three MRPC detectors; it is organized in clusters and single telescope stations distributed all over the Italian territory and installed in High Schools, covering an area larger than 3 × 105 km2
It is worth noting that the time slewing (TS) correction, explained in details in the paragraph, is not applied in this case, while is included the analysis performed on Run 3
Summary
The chambers composing the EEE telescopes are MRPC detectors designed for combining good tracking and timing capabilities, low construction costs and easy assembly procedures. The detector structure (Fig. 1) consists of 6 gas gaps obtained by stacking glass sheets, with voltage applied only to the external ones, and leaving the inner ones floating. Anode and cathode are in contact, on the outer surfaces, with a sheet of Mylar (175 cm × 86 cm in dimensions) stretched on a vetronite panel of equal area on whose external surface 24 copper strips are laid out (180 cm × 2.5 cm spaced by 7 mm), to collect the signals induced by particles. High voltage to the chambers, typically in the 18-20 kV range, is provided by a set of DC/DC converters, with output voltage roughly a factor 2000 with respect to the driving low voltage (LV).
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