First results from atic beam-test at cern

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The Advanced Thin Ionization Calorimeter (ATIC) balloon-borne experiment will fly on several 10-day Long Duration Balloon (LDB) flights from McMurdo Station, Antarctica. Its main goal is cosmic-ray elemental spectra measurement from 50 GeV to 100 TeV for nuclei from hydrogen to iron. In September 1999 the ATIC detector was exposed to high-energy beams at CERN's SPS accelerator, within the framework of the development program for the Advanced Cosmic-ray Composition Experiment for the Space Station (ACCESS). We present initial results from these beam-tests, including energy resolutions for electrons and protons at several beam energies from 100 GeV to 375 GeV. Results on signal linearity and collection efficiency estimates are also presented. We show how these results compare with expectations based on simulations, and their expected impacts on mission performance. © 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

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Advances in Space Research

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