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CALET (CALorimetric Electron Telescope) is a high energy astroparticlephysics experiment planned for a long exposure mission aboard the InternationalSpace Station (ISS) by the Japanese Aerospace Exploration Agency, incollaboration with the Italian Space Agency (ASI) and NASA. The main sciencegoal is high precision measurements of the inclusive electron (+positron)spectrum below 1 TeV and the exploration of the energy region above 1 TeV,where the shape of the high end of the spectrum might unveil the presence ofnearby sources of acceleration. CALET has been designed to achieve a largeproton rejection capability (>10$^5$) with a fine grained imaging calorimeter(IMC) followed by a total absorption calorimeter (TASC), for a total thicknessof 30 X$_{0}$ and 1.3 proton interaction length. With an excellent energyresolution and a lower background contamination with respect to previousexperiments, CALET will search for possible spectral signatures of dark matterwith both electrons and gamma rays. CALET will also measure the high energyspectra and relative abundance of cosmic nuclei from proton to iron and detecttrans-iron elements up to Z$\sim$40. The charge identification of individualnuclear species is performed by a dedicated module (CHD) and by multiple dE/dxmeasurements in the IMC. With a large exposure and high energy resolution,CALET will be able to verify and complement the observations of CREAM, PAMELAand AMS-02 on a possible deviation from a pure power-law of proton and Hespectra in the few hundred GeV region and to extend the study to the multi-TeVregion. CALET will also contribute to clarify the present experimental pictureon the energy dependence of the boron/carbon ratio, below and above 1 TeV/n,thereby providing valuable information on cosmic-ray propagation in the galaxy.Gamma-ray transients will be studied with a dedicated Gamma-ray Burst Monitor(GBM).

CALET: a high energy astroparticle physics experiment on the ISS