Browsing by Author "Maestro, Paolo"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
Item CALET measurements with cosmic nuclei: expected performances of tracking and charge identification(Proceedings of Science, 2016-08-18) Brogi, Paolo; Marrocchesi, Pier Simone; Maestro, Paolo; Mori, Nicola; Cannady, Nicholas; CALET CollaborationCALET is a space mission currently in the final phase of preparation for a launch to the International Space Station (ISS), where it will be installed on the Exposed Facility of the Japanese Experiment Module (JEM-EF). In addition to high precision measurements of the electron spectrum, CALET will also perform long exposure observations of cosmic nuclei from proton to iron and will detect trans-iron elements with a dynamic range up to Z = 40. The energy measurement relies on two calorimeter systems: a fine grained imaging calorimeter (IMC) followed by a total absorption calorimeter (TASC) for a total thickness of 30 X₀ and 1.3 proton interaction length. A dedicated module (a charge detector, CHD), placed at the top of the apparatus, identifies the atomic number Z of the incoming cosmic ray. In this paper, the IMC performances in providing tracking capabilities and a redundant charge measurement by multiple ᵈᴱ/dx samples are studied for the case of proton and He identification with a preliminary version of the analysis. The CALET mission is funded by the Japanese Space Agency (JAXA), the Italian Space Agency (ASI), and NASA.Item Energy spectra of carbon and oxygen cosmic rays with CALET on the International Space Station(Proceedings of Science, 2022-03-18) Maestro, Paolo; Cannady, Nicholas; Hams, Thomas; Krizmanic, John F.; Link, J.; Sakai, Kenichi; CALET Collaboration; et alWe present the measurements of the energy spectra of carbon and oxygen nuclei in cosmic rays based on 4 years of observation with the Calorimetric Electron Telescope (CALET) on the International Space Station. The energy spectra are measured from 10 GeV/n to 2.2 TeV/n with an all calorimetric instrument with a total thickness corresponding to 1.3 nuclear interaction length and equipped with charge detectors capable of single element resolution. Data analysis, including the detailed assessment of systematic uncertainties, and results are reported. The observed carbon and oxygen fluxes show a spectral hardening around 200 GeV/n established with a significance > 3σ. They have the same energy dependence and a constant C/O flux ratio above 25 GeV/n. These measurements will contribute to a better understanding of the origin of the spectral hardening.Item Measurement of cosmic-ray carbon and oxygen energy spectra with CALET(Elsevier, 2019-11-21) Maestro, Paolo; Cannady, Nicholas; Hams, Thomas; Krizmanic, John F.; Sakai, Kenichi; CALET Collaboration; et alThe CALorimetric Electron Telescope (CALET) is a space mission installed on the International Space Station (ISS) in August 2015. In addition to high precision measurements of the electron spectrum up to TeV scale, CALET will also investigate the mechanism of cosmic-ray (CR) acceleration and propagation in the Galaxy, by performing direct measurements of the energy spectra and elemental composition of CR nuclei from H to Fe, and the abundance of trans-iron elements up to about Z = 40. The instrument consists of two layers of segmented plastic scintillators to identify the particle charge, a thin (3 radiation lengths) tungsten-scintillating fiber calorimeter providing accurate particle tracking, and a thick (27 radiation lengths) calorimeter made of lead-tungstate crystal logs. In this paper, we discuss the analysis procedure developed to reconstruct and select carbon and oxygen nuclei in cosmic rays and present the preliminary measurement of their energy spectra based on the analysis of the data collected from October 2015 to February 2018.Item Measurement of the energy spectra of carbon and oxygen nuclei in cosmic rays with CALET(Proceedings of Science, 2021-07-02) Maestro, Paolo; Cannady, Nicholas; Hams, Thomas; Krizmanic, John F.; Sakai, Kenichi; CALET Collaboration; et alThe Calorimetric Electron Telescope (CALET) was installed onboard the International Space Station in August 2015 and since October 2015 it is collecting data with smooth and continuous operations. The instrument consists of two layers of segmented plastic scintillators to identify the charge of individual elements from proton to iron, a thin imaging tungsten scintillating fiber calorimeter providing accurate particle tracking and complementary charge measurement, and a thick total absorption calorimeter made of lead-tungstate crystal logs. In addition to high preci- sion measurements of the electron spectrum up to several TeV, CALET can measure the individual spectra and elemental composition of cosmic-ray nuclei from few tens of GeV to the PeV scale, which is of fundamental importance to shed light on the mechanism of acceleration and propaga- tion of cosmic rays in the Galaxy. In this paper, preliminary measurements of the energy spectra of carbon and oxygen, based on the first three years of collected data, will be presented.Item Particle tracking in the CALET experiment(Proceedings of Science, 2018-08-03) Maestro, Paolo; Mori, Nicola; Cannady, Nicholas; CALET CollaborationThe Calorimetric Electron Telescope (CALET) is a space mission installed on the Exposed Facility of the Japanese Experiment Module (JEM-EF) of the International Space Station (ISS) in August 2015 and collecting data since October 2015. In addition to high precision measurements of the electron spectrum up to TeV scale, CALET will also investigate the mechanism of cosmic-ray (CR) acceleration and propagation in the Galaxy, by performing direct measurements of the energy spectra and elemental composition of CR nuclei from H to Fe, and the abundance of trans-iron elements up to about Z=40. The instrument consists of two layers of segmented plastic scintillators to identify the particle charge, a thin (3 radiation lengths) tungsten-scintillating fiber calorimeter providing accurate particle tracking, and a thick (27 radiation lengths) calorimeter made of lead-tungstate crystal logs. In this paper we will describe an original reconstruction method of the primary particle direction based on a combinatorial Kalman filter algorithm. This method exploits the fine granularity and imaging capability of the IMC and provides robust track finding and fitting, allowing to identify the incident CR track in a large amount of shower particle tracks backscattered from the calorimeter. The track fitting algorithm has been extensively validated and tuned with simulated data. Its performance (angular resolution, impact point resolution, tracking efficiency) for electrons and nuclei will be discussed and comparisons between flight data and simulations will be shown.