The CALorimetric Electron Telescope CALET is collecting science data on the International Space Station since October 2015 with excellent and continuous performance. Energy is measured with a deep homogeneous calorimeter (1.2 nuclear interaction lengths, 27 radiation lengths) preceded by an imaging pre-shower (3 radiation lengths, 1mm granularity) providing tracking and 10-5 electron/proton discrimination. Two independent sub-systems identify the charge Z of the incident particle from proton to iron and above (Z<40). CALET measures the cosmic-ray electron + positron flux up to 20 TeV, gamma rays up to 10 TeV, and nuclei up to the PeV scale. In this paper, we report the on-orbit performance of the instrument and summarize the main results obtained during the first 5 years of operation, including the electron + positron energy spectrum and the individual spectra of protons, heavier nuclei and iron. Solar modulation and gamma-ray observations are also concisely reported, as well as transient phenomena and the search for gravitational wave counterparts.

CALET Observations during the First 5 Years on the ISS

Messineo A. M.;
2021-01-01

Abstract

The CALorimetric Electron Telescope CALET is collecting science data on the International Space Station since October 2015 with excellent and continuous performance. Energy is measured with a deep homogeneous calorimeter (1.2 nuclear interaction lengths, 27 radiation lengths) preceded by an imaging pre-shower (3 radiation lengths, 1mm granularity) providing tracking and 10-5 electron/proton discrimination. Two independent sub-systems identify the charge Z of the incident particle from proton to iron and above (Z<40). CALET measures the cosmic-ray electron + positron flux up to 20 TeV, gamma rays up to 10 TeV, and nuclei up to the PeV scale. In this paper, we report the on-orbit performance of the instrument and summarize the main results obtained during the first 5 years of operation, including the electron + positron energy spectrum and the individual spectra of protons, heavier nuclei and iron. Solar modulation and gamma-ray observations are also concisely reported, as well as transient phenomena and the search for gravitational wave counterparts.
2021
Marrocchesi, P. S.; Adriani, O.; Akaike, Y.; Asaoka, Y.; Berti, E.; Bigongiari, G.; Bongi, M.; Brogi, P.; Bruno, A.; Cannady, N.; Checchia, C.; Cherry, M. L.; Collazuol, G.; Ficklin, A. W.; Guzik, T. G.; Ichimura, M.; Israel, M. H.; Kasahara, K.; Kawakubo, Y.; Krizmanic, J. F.; Messineo, A. M.; Mitchell, J. W.; Miyake, S.; Mori, M.; Mori, N.; Motz, H. M.; Munakata, K.; Pacini, L.; Palma, F.; Papini, P.; Rauch, B. F.; Ricciarini, S. B.; Sakamoto, T.; Sasaki, M.; Stolzi, F.; Sulaj, A.; Tamura, T.; Torii, S.; Wefel, J. P.; Yoshida, K.; Zober, W. V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1134030
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