Abstract
AMS-02(Alpha Magnetic Spectrometer) is an high energy particle detector developed to operate on the International Space Station. AMS-02 was installed on ISS on May 2011 and is expected to operate for 10-20 years collecting about 160-320 billions of events. The main goals of the experiment are the detection of primordial antimatter and dark matter by studying spectra and flux of different cosmic ray components (protons, electrons, nuclei, positrons, antiprotons, gamma rays, etc) in the high energy range (1-2000 GeV). Identification of electrons, positrons and photons is provided by the Electromagnetic Calorimeter (ECAL), a fine grained lead-scintillating fibers sampling calorimeter that allows for a precise three-dimensional imaging of the longitudinal and lateral shower development. It provides an excellent reconstruction of electromagnetic shower energy and a highly efficient rejection of the hadronic background. Thanks to the 3D shower reconstruction capability, ECAL allows a stand-alone determination of the incoming particle direction, with unprecedented angular resolution. As a result, ECAL is able to identify high energy photons coming from galactic or extragalactic sources.
Highlights
The Electromagnetic calorimeterElectromagnetic Calorimeter (ECAL) The calorimeter has been designed to precisely reconstruct the longitudinal and the lateral profiles of electromagnetic showers and to measure the deposited energy
AMS-02(Alpha Magnetic Spectrometer) is an high energy particle detector developed to operate on the International Space Station
The main goals of AMS are the precise measurements of cosmic ray composition and flux, the indirect search of Dark Matter and search and study of primordial anti-matter
Summary
ECAL The calorimeter has been designed to precisely reconstruct the longitudinal and the lateral profiles of electromagnetic showers and to measure the deposited energy. For these characteristics it is used to provides energy and axis direction of electromagnetic showers as well as reject the protons using the different shape of hadronic showers. Each anode covers an active area equal to 9x9 mm corresponding to 35 fibers called cell (figure 2b). The signal of the last dynode of each PMT is readout to ensure a redundant measurement of energy deposition and to provide input to the trigger logic. Equalization and calibrations procedures have been created and verified and the calorimeter performance has been measured
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