The CALET Mission for Observing High Energy Cosmic Rays on Japanese Experiment Module of ISS

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  • CALET Mission for Observing High Energy Cosmic Rays on Japanese Experiment Module of ISS

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The CALorimetric Electron Telescope, CALET, mission is proposed for the Japanese Experiment Module Exposed Facility, JEM-EF, of the International Space Station. The mission goal is to reveal the high-energy phenomena in the universe by carrying out a precise measurement of the electrons in 1 GeV-10 TeV and the gamma-rays in 20 MeV-several TeV. The instrument will be composed of an imaging calorimeter of scintillating fibers and a total absorption calorimeter of BGO. The total thickness of absorber is 36 r.1 for electromagnetic particles and 1.6 m.f.p for protons. Total weight of the payload is nearly 2,500 kg, and the effective geometrical factor for the electrons could be larger than 0.5 ～ 1 m2 sr. The CALET has a unique capability to measure the electrons and the gamma-rays over 1 TeV since the hadron rejection power might be 10 6 and the energy resolution of electromagnetic particles better than a few % over 100 GeV. Therefore, it is promising to detect the change of energy spectra and the γ-ray line expected from candidates of the dark matter. We are expecting to launch the CALET around 2012 by the Japanese H-II Transfer Vehicle, HTV, and to observe for three years.

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