Experimental results from a sandwich calorimeter using U absorbers and 0.25 m of Si active area |
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Authors: | S Pensotti PG Rancoita C Simeone L Vismara G Barbiellini and A Seidman |
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Affiliation: | aINFN, Milan, Italy bINFN, Trieste and University of Trieste, Italy cTel-Aviv University, Tel Aviv, Israel |
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Abstract: | The electromagnetic section of a hadronic calorimeter, consisting of uranium absorbers and of silicon sampling units with an active area of 0.25 m2, was investigated. The overall performance of the silicon detectors and especially developed associated electronics, seems to be stable and reliable. During a four-week run at the t9, CERN-PS (Proton Synchrotron) electron beam (energies of 2 to 6 GeV), no variation of energy calibration of the calorimeter was observed. The energy resolution for electromagnetic showers was found to be about
, where E is the energy of the incoming electron and τ is the number of radiation lengths of passive material interspaced between two active samplers, for a calorimeter depth of 15.6 X0 (radiation lengths), with Si samplers depleted to 200 μm. The fiberglass supports of the silicon mosaics cause a reduction of energy response to electromagnetic showers. It can be exploited to equalize the response of a Si/U hadronic calorimeter to incoming electrons and hadrons. |
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