The CALET Misson for the International Space Station

Physics

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Scientific paper

The CALorimetric Electron Telescope, CALET, mission is proposed for the Japanese Experiment Module Exposed Facility, JEM-EF, of the International Space Station. The major goals of the mission are to reveal the origin of cosmic-ray electrons and the diffusion characteristics in the Galaxy. The instrument will be composed of an imaging calorimeter of scintillating fibers and a total absorption calorimeter. The total thickness of absorber is 45 r.l for electromagnetic particles and 2.1 m.f.p for protons. Total weight of the payload is nearly 2,200 kg, and the effective geometrical factor for the electrons might be larger than 0.5 m2 sr. The hadron rejection power should be 106 in order to observe the electrons up to 10 TeV. The detector has also capability of measuring gamma-rays from 0.1 GeV to 1 TeV, keeping the energy resolution within a few % over 10 GeV. We are expecting to launch the CALET around 2007 by the Japanese H-II Transfer Vehicle, HTV.

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