High altitude test of RPCs for the Argo YBJ experiment

INFN and Dipartimento di Fisica dell'Università di Roma Tre, Italy
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (Impact Factor: 1.22). 04/2000; 443(2-3):342-350. DOI: 10.1016/S0168-9002(99)01079-7


A 50 m2 RPC carpet was operated at the YanBaJin Cosmic Ray Laboratory (Tibet) located 4300 m a.s.l. The performance of RPCs in detecting Extensive Air Showers was studied. Efficiency and time-resolution measurements at the pressure and temperature conditions typical of high mountain laboratories, are reported.

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    • "The RPCs are operated in streamer mode by using a gas mixture (Ar 15%, Isobutane 10%, TetraFluoroEthane 75%) for high altitude operation [1]. The high voltage settled at 7.2 kV ensures an overall efficiency of about 96%. "
    R Iuppa ·
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    ABSTRACT: The ARGO-YBJ experiment consists of a 5000 m2 single layer of Resistive Plate Chambers situated at Yangbajing, Tibet (P.R. of China), 4300 meters a.s.l. (atmospheric depth 600 g/cm2). The percentage of active area all over the carpet is 92% and a partially instrumented guard ring (1700 m2) around the central zone extends the instrumented area up to 11000 m2. The experiment is operated in scaler mode, shower mode and analog mode and is sensitive to cosmic rays in the 109-1015 eV energy range. From few hundreds GeV on, the arrival direction of cosmic rays is inferred by the study of the induced extensive air showers. A review of the most important results of the ARGO-YBJ experiment in gamma-ray astronomy and cosmic-ray physics will be given, focusing on the potential of RPCs in ground-based astroparticle physics.
    Journal of Instrumentation 08/2013; 8(08):T08002. DOI:10.1088/1748-0221/8/08/T08002 · 1.40 Impact Factor
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    • "Cherenkov detectors reach TeV energies, but with a low duty cycle and a small solid angle. For these reasons, the detection of gamma ray sources in the TeV region requires speci®c experiments, like Milagro in New Mexico [8] or ARGO-YBJ in Tibet [9] [10]. The performances of these kinds of detectors are discussed in a very general way in Ref. [11]. "
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    ABSTRACT: A neural algorithm was developed to separate electromagnetic and hadronic showers detected with an air shower array. The requirements on the detector performance are very general, so that the results of the calculation can be applied to a wide set of detectors, actually operating or planned for the future. More then 700 000 showers were generated using the Corsika package and were propagated through an ideal pixel-like detector. The peculiarities of each class of showers are presented in detail and it is shown how the neural net architecture is structured around them. The neural net performances were studied for different sets of simulated data. The physics relevance of the gamma–hadron separation is also discussed.
    Astroparticle Physics 03/2001; 15(1-15):65-77. DOI:10.1016/S0927-6505(00)00152-3 · 3.58 Impact Factor
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    ABSTRACT: Multigap resistive plate chambers with 0.3 mm gas gaps operated in avalanche mode at atmospheric pressure have reached timing accuracies below 50 ps σ with efficiencies above 99%. The avalanches in high homogeneous electric fields of 100 kV/cm are strongly influenced by space charge effects which are the main topic of this report. A Monte Carlo simulation applying well known detector physics processes reproduces accurately the measured efficiencies, time resolutions and charge spectra of these RPCs. The detailed simulation of avalanche saturation explains; the small observed charges and the linear increase of average charges with high voltage.
    Nuclear Science Symposium Conference Record, 2002 IEEE; 12/2002
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