  CALET (Calorimetric Electron Telescope), installed on the ISS in August 2015,
directly measures the electron+positron cosmic rays flux up to 20 TeV. With its
proton rejection capability of 1:10^5 and an aperture of 1200 cm^2 sr, it will
provide good statistics even well above one TeV, while also featuring an energy
resolution of 2%, which allows it to detect fine structures in the spectrum.
Such structures may originate from Dark Matter annihilation or decay, making
indirect Dark Matter search one of CALET's main science objectives among others
such as identification of signatures from nearby supernova remnants, study of
the heavy nuclei spectra and gamma astronomy. The latest results from AMS-02 on
positron fraction and total electron+positron flux can be fitted with a
parametrization including a single pulsar as an extra power law source with
exponential cut-off, which emits an equal amount of electrons and positrons.
This single pulsar scenario for the positron excess is extrapolated into the
TeV region and the expected CALET data for this case are simulated. Based on
this prediction for CALET data, the sensitivity of CALET to Dark Matter
annihilation in the galactic halo has been calculated. It is shown that CALET
could significantly improve the limits compared to current data, especially for
those Dark Matter candidates that feature a large fraction of annihilation
directly into electron+positron, such as the LKP (Lightest Kaluza-Klein
Particle).
