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 / 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.. - In: PHYSICS OF ATOMIC NUCLEI. - ISSN 1063-7788. - ELETTRONICO. - 84:(2021), pp. 985-994. [10.1134/S1063778821130214]
CALET Observations during the First 5 Years on the ISS
Adriani O.;Berti E.;Bigongiari G.;Bongi M.;Checchia C.;Collazuol G.;Mori N.;Pacini L.;Papini P.;Ricciarini S. B.;Sakamoto T.;
2021
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.
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