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The boronated scintillator detector of the ISS-CREAM experiment
Amare, Y.,Anderson, T.,Angelaszek, D.,Anthony, N.,Cheryian, K.,Choi, G.H.,Copley, M.,Coutu, S.,Derome, L.,Eraud, L.,Hagenau, L.,Han, J.H.,Huh, H.G.,Hwang, Y.S.,Hyun, H.J.,Im, S.,Jeon, H.B.,Jeon, J.A. Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.943 No.-
<P><B>Abstract</B></P> <P>The Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM) instrument is a next-generation experiment for the direct detection and study of cosmic-ray nuclei and electrons. With a long exposure in low Earth orbit, the experiment will determine the particle fluxes and spectral details of cosmic-ray nuclei from hydrogen to iron, over an energy range of about 1 <SUP> 0 12 </SUP> eV to > 1 <SUP> 0 15 </SUP> eV, and of cosmic-ray electrons over an energy range of about 5 × 1 <SUP> 0 10 </SUP> eV to > 1 <SUP> 0 13 </SUP> eV. The instrument was deployed to the ISS in August 2017 on the SpaceX CRS-12 mission. We review the design, implementation and performance of one of the ISS-CREAM detector systems: a boron loaded scintillation detector used in discriminating electron-induced events from the much more abundant cosmic-ray nuclei.</P>
Measurement of delayed fluorescence in plastic scintillator from 1 to 10 μ s
Nutter, S.,Amare, Y.,Anderson, T.,Angelaszek, D.,Anthony, N.,Cheryian, k.,Choi, G.H.,Copley, M.,Coutu, S.,Derome, L.,Eraud, L.,Hagenau, L.,Han, J.H.,Huh, H.G.,Hwang, Y.S.,Hyun, H.J.,Im, S.,Jeon, H.B. Elsevier 2019 Nuclear instruments & methods in physics research. Vol.942 No.-
<P><B>Abstract</B></P> <P>The time dependence of the relative light emission of Eljen Technology EJ-200 polyvinyltoluene-based plastic scintillator was measured between 1 and 10 μ s after the passage of a particle shower, a singly charged particle (atmospheric muon), and with a UV LED exciting the fluor. This was compared in magnitude to the integrated response for the prompt light (within 500 ns of excitation). A model with a time-dependent yield consisting of three exponentially decaying components (fast, medium, and slow) was developed to fit the data. Note that the exact time structure of early (< 1 μ s ) light emission was not measured for individual components, only for all three components together This model assumes all three components share the same rise time. The decay time constants of the fast, medium and slow components are, respectively, 7.8 ns, 490 ns, and 2370 ns. The relative total normalized yields for each component are: fast 95.8%, medium 2.2%, and slow 2.0%.</P>
Lee, J.,Amare, Y.,Anderson, T.,Angelaszek, D.,Anthony, N.,Cheryian, K.,Choi, G.H.,Copley, M.,Coutu, S.,Derome, L.,Eraud, L.,Hagenau, L.,Han, J.H.,Hong, G.,Huh, H.G.,Hwang, Y.S.,Hyun, H.J.,Im, S.,Jeon, Elsevier 2019 Astroparticle physics Vol.112 No.-
<P><B>Abstract</B></P> <P>The Cosmic Ray Energetics And Mass experiment for the International Space Station (ISS-CREAM) is a space-borne mission designed for the precision measurement of the energy and elemental composition of cosmic rays. The Silicon Charge Detector (SCD), placed at the top of the ISS-CREAM payload, consists of 4 layers. Each layer has 2688 silicon pixels and associated electronics arranged in such a fashion that its active detection area of 78.2 × 73.6 cm<SUP>2</SUP> is free of dead area. The foremost goal of the SCD is to efficiently and precisely measure the charge of cosmic rays passing through it. The 4-layer configuration was chosen to achieve the best precision in measuring the charge of cosmic rays within the constraints on the mass, volume and power allotted to it. The amount of material used for its support structure was minimized as well to reduce the chance of interactions of the cosmic ray within the structure. Given the placement of the SCD, its 4-layer configuration and the minimal amount of material in the cosmic-ray trajectory, the SCD is designed to measure the charge of cosmic rays ranging from protons to iron nuclei with excellent detection efficiency and charge resolution. We present the design and fabrication of the SCD as well as its performance during space environment tests which it underwent successfully. We also present its performance in charge measurement using heavy ions in a beam test at CERN, the European Organization for Nuclear Research.</P>