Aug 27 – 31, 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone

The Calorimetric Electron Telescope (CALET) on the International Space Station: Latest results from the first three-years on orbit

Aug 27, 2018, 2:51 PM
-2- B. von Langenbeck

-2- B. von Langenbeck

Talk Cosmic Rays Cosmic Rays


Yoichi Asaoka


The CALorimetric Electron Telescope (CALET) space experiment, which has been developed by Japan in collaboration with Italy and the United States, is a high-energy astroparticle physics mission installed on the International Space Station (ISS). The primary goals of the CALET mission include investigating possible nearby sources of high-energy electrons, studying the details of galactic particle propagation and searching for dark matter signatures. The CALET experiment will measure the flux of cosmic-ray electrons (including positrons) up to 20 TeV, gamma-rays up to 10 TeV and nuclei with Z=1 to 40 up to 1,000 TeV. The instrument consists of two layers of segmented plastic scintillators for the cosmic-ray charge identification (CHD), a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter (IMC) and a 27 radiation length thick lead-tungstate calorimeter (TASC). CALET has sufficient depth, imaging capabilities and excellent energy resolution to allow for a clear separation between hadrons and electrons and between charged particles and gamma rays. The instrument was launched on August 19, 2015 to the ISS with an unmanned carrier HTV-5 and installed on the Japanese Experiment Module-Exposed Facility (JEM-EF). Since the start of operation in mid-October, 2015, a continuous observation has being kept mainly by triggering high energy (>10 GeV) showers without any major interruption. The number of the triggered events over 10 GeV is nearly 20 million per month. By using the data obtained during the first three-years, we will have a summary of the CALET observations: 1) Electron+Positron energy spectrum up to 5 TeV, 2) Proton and Nuclei spectrum up to 100 TeV, 3) Gamma-ray observations, with the performance of observations on orbit. We will present also the results of observations of the electromagnetic counterparts to LIGO-VIRGO gravitational wave events and high-energy counterparts to GRB events measured with the CALET Gamma-ray Burst Monitor (CGBM).

Primary author

Prof. Shoji Torii (Waseda University)

Presentation materials