Full Dynamic Range Energy Calibration of CALET onboard the International Space Station

dc.contributor.authorMiyata, Ryohei
dc.contributor.authorAsaoka, Yoichi
dc.contributor.authorTorii, Shoji
dc.contributor.authorCannady, Nicholas
dc.contributor.authorCALET Collaboration
dc.date.accessioned2023-10-20T13:59:20Z
dc.date.available2023-10-20T13:59:20Z
dc.date.issued2018-08-03
dc.description35th International Cosmic Ray Conference — ICRC2017; Bexco, Busan, Korea; 10–20 July, 2017en_US
dc.description.abstractIn August 2015, the CALET (CALorimetric Electron Telescope) instrument, designed for long exposure observations of high energy cosmic rays, docked with the ISS (International Space Station) 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 deep 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 to obtain a degree of precision necessary to achieve high energy resolution. The entire dynamic range is covered by four different gain ranges, based on two photon detectors - an avalanche photodiode (APD) and a regular photodiode (PD) - in conjunction with a shaper amplifier with two gain ranges. The energy calibration process consists of three steps. First step is determination of conversion factor between ADC units and the energy deposit. By this way, the conversion factor of APD high gain is determined. Next step is linearity measurements over each gain range. UV pulse laser calibrations were performed on ground to confirm this linearity. Third step is correlation measurements between adjacent gain ranges. After confirming the input-output linearity of each readout channel of TASC, using the conversion factor of APD high and correlations, the conversion factor of all readout channels can be determined. Finally, using the estimated calibration errors and measured detector responses, such as the pedestal noise, the errors in the energy deposit sum were calculated for simulated electron events from 1 GeV to 20 TeV. As a result, 2% precision level energy calibration was achieved over the entire dynamic range above 10 GeV.en_US
dc.description.sponsorshipWe gratefully acknowledge JAXA’s contributions to the development of CALET and to operations on board the ISS. We also wish to express our sincere gratitude to ASI and NASA for their support of the CALET project. Finally, this work was partially supported by a JSPS Grant-in-Aid for Scientific Research (S) (no. 26220708) and by the MEXT-Supported Program for the Strategic Research Foundation at Private Universities (2011-2015) (no. S1101021) at Waseda University.en_US
dc.description.urihttps://pos.sissa.it/301/207/en_US
dc.format.extent8 pagesen_US
dc.genreconference papers and proceedingsen_US
dc.identifierdoi:10.13016/m2wgvw-jyxm
dc.identifier.citationMiyata, Ryohei, Yoichi Asaoka, S. Torii, and on behalf of the CALET Collaboration. “Full Dynamic Range Energy Calibration of CALET Onboard the International Space Station.” In Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017), 301:207. SISSA Medialab, 2018. https://doi.org/10.22323/1.301.0207.en_US
dc.identifier.urihttps://doi.org/10.22323/1.301.0207
dc.identifier.urihttp://hdl.handle.net/11603/30303
dc.language.isoen_USen_US
dc.publisherProceedings of Scienceen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleFull Dynamic Range Energy Calibration of CALET onboard the International Space Stationen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0003-2916-6955en_US

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