Observation of Cosmic Rays with CALET on the International Space Station

We have a plan to observe cosmic rays on the International Space Station (ISS). We have been developing a detector, CALET (CALorimetric Electron Telescope), which will be installed to an attach point for heavy payload (2.5 tons) on the Exposed Facility of Japanese Experiment Module (JEM/EF). The CALET consists of two types of calorimeter, an imaging calorimeter (IMC) at upper part and a total absorption calorimeter (TASC) at lower part. It is improved for the cosmic-ray observation in higher energy by upgrading an imaging shower detector, BETS, developed for balloon experiments. The main objective of the CALET is to observe electrons in the energy range between 1 GeV and 10 TeV. It is also possible to observe gamma rays of the energy from 20 MeV to 10 TeV and nuclei of the energy from 1 TeV to 1000 TeV. We will introduce the concept of the instrument and report the expected results from the observations of electron, gamma ray, and nuclei with CALET.