The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years of Operation

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https://www.epj-conferences.org/articles/epjconf/abs/2019/13/epjconf_isvhecri2018_13001/epjconf_isvhecri2018_13001.html

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https://doi.org/10.1051/epjconf/201920813001
 http://hdl.handle.net/11603/30298

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0002-9489-1515
 https://orcid.org/0000-0003-2916-6955
 https://orcid.org/0000-0002-9690-9352

Date

2019-05-10

Type of Work

conference papers and proceedings
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Citation of Original Publication

Asaoka, Y., O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, et al. “The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years of Operation.” EPJ Web of Conferences 208 (2019): 13001. https://doi.org/10.1051/epjconf/201920813001.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

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 on the International Space Station (ISS). The primary goals of the CALET mission include investigation of possible nearby sources of high-energy electrons, detailed study of galactic cosmic-ray acceleration and propagation, and search for dark matter signatures. With a long-term observation onboard the ISS, the CALET experiment measures the flux of cosmic-ray electrons (including positrons) up to 20 TeV, gamma-rays to 10 TeV, and nuclei up to 1,000 TeV based on its charge separation capability from Z = 1 to 40. Since the start of science operation in mid-October, 2015, a continuous observation has been maintained without any major interruptions. The number of triggered events over 10 GeV is nearly 20 million per month. By using the data obtained during the first two-years, here we present a summary of the CALET observations: 1) Electron+positron energy spectrum, 2) Nuclei analysis, 3) Gamma-ray observation with a characterization of the on-orbit performance. The search results for the electromagnetic counterparts of LIGO/Virgo gravitational wave events are also discussed.