The AMS-02 lead-scintillating fibres Electromagnetic Calorimeter

摘要

The Electromagnetic Calorimeter (ECAL) of the AMS-02 experiment is a fine grained lead-scintillating fibres sampling calorimeter that allows for a precise three-dimensional imaging of the longitudinal and lateral shower development.It provides a high (≥ 10~6) electron/hadron discrimination with the other AMS-02 detectors [1] and good energy resolution.The calorimeter also provides a standalone photon trigger capability to AMS-02.The mechanical assembly was realized to ensure minimum weight,still supporting the intrinsically heavy calorimeter during launch.ECAL light collection system and electronics are designed to measure electromagnetic particles over a wide energy range,from GeV up to TeV.A full-scale flight-like model was tested using electrons and proton beams with energies ranging from 6 to 250 GeV.