Energy calibration of CALET onboard the International Space Station

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1-s2.0-S0927650517300786-main.pdf (2.33 MB)

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https://www.sciencedirect.com/science/article/pii/S0927650517300786

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https://doi.org/10.1016/j.astropartphys.2017.03.002
 http://hdl.handle.net/11603/30282

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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

Author/Creator

Author/Creator ORCID

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

Date

2017-03-21

Type of Work

journal articles
Text

Department

Program

Citation of Original Publication

Asaoka, Y., Y. Akaike, Y. Komiya, R. Miyata, S. Torii, O. Adriani, K. Asano, et al. “Energy Calibration of CALET Onboard the International Space Station.” Astroparticle Physics 91 (May 1, 2017): 1–10. https://doi.org/10.1016/j.astropartphys.2017.03.002.

Rights

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.
Public Domain Mark 1.0

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Abstract

In August 2015, the CALorimetric Electron Telescope (CALET), designed for long exposure observations of high energy cosmic rays, docked with the International Space Station (ISS) and shortly thereafter began to collect data. CALET will measure the cosmic ray electron spectrum over the energy range of 1 GeV to 20 TeV with a very high resolution of 2% above 100 GeV, based on a dedicated instrument incorporating an exceptionally thick 30 radiation-length calorimeter with both total absorption and imaging (TASC and IMC) units. Each TASC readout channel must be carefully calibrated over the extremely wide dynamic range of CALET that spans six orders of magnitude in order to obtain a degree of calibration accuracy matching the resolution of energy measurements. These calibrations consist of calculating the conversion factors between ADC units and energy deposits, ensuring linearity over each gain range, and providing a seamless transition between neighboring gain ranges. This paper describes these calibration methods in detail, along with the resulting data and associated accuracies. The results presented in this paper show that a sufficient accuracy was achieved for the calibrations of each channel in order to obtain a suitable resolution over the entire dynamic range of the electron spectrum measurement.