タムラ タダヒサ   Tamura Tadahisa
  田村 忠久
   所属   神奈川大学  工学部 物理学教室
    神奈川大学大学院  工学研究科 工学専攻(応用物理学領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2013/07
形態種別 学術雑誌
標題 Particle Beam Tests of the Calorimetric Electron Telescope
執筆形態 共著
掲載誌名 33rd International Cosmic Ray Conference, Rio de Janeiro 2013
著者・共著者 T.Tamura for the CALET collaboration
概要 The Calorimetric Electron Telescope (CALET) is a new mission addressing outstanding astrophysics questions including the nature of dark matter, the sources of high-energy particles and photons, and the details of particle acceleration and transport in the galaxy by measuring the high-energy spectra of electrons, nuclei, and gamma-rays. It will launch on HTV-5 (H-II Transfer Vehicle 5) in 2014 for installation on the Japanese Experiment Module—Exposed Facility (JEM-EF) of the International Space Station. The CALET collaboration is led by JAXA and includes researchers from Japan, the U.S. and Italy. The CALET Main Telescope uses a plastic scintillator charge detector followed by a 30 radiation-length (Xo) deep particle calorimeter divided into a 3 Xo imaging calorimeter, with scintillating optical fibers interleaved with thin tungsten sheets, and a 27 Xo fully-active total-absorption calorimeter made of lead tungstate scintillators. CALET prototypes were tested at the CERN (European Laboratory for Particle Physics) Super Proton Synchrotron (SPS) in 2010 and 2011 using electrons to 300 GeV and protons to 375 GeV. In 2012 the CALET Engineering Model was tested at the SPS with electrons to 300 GeV and protons to 400 GeV. The flight charge detectors were tested in 2013 at the SPS in heavy-ion beams from fragmented lead at 30 GeV/nucleon, to confirm the performance shown in prototype tests at the GSI-SIS heavy-ion accelerator facility. These high-precision, high-statistics tests showed that CALET can have the precise charge resolution, the fine discrimination between cosmic-ray electrons and protons, and the excellent energy resolution required to meet its broad-ranging goals. Here, the CALET beam tests and the results of those tests will be presented and implications for the mission measurement goals will be discussed.