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 2009/07
形態種別 学術雑誌
標題 Simulated Performance of CALET on ISS Orbit
執筆形態 共著
掲載誌名 PROCEEDINGS OF THE 31st ICRC, LODZ 2009
巻・号・頁 http://icrc2009.uni.lodz.pl/proc/pdf/icrc0568.pdf
著者・共著者 Yosui Akaike, Katsuaki Kasahara, Shoji Torii, Shunsuke Ozawa, Koichi Taira and Kenji Yoshida for the CALET Collaboration
概要 国際宇宙ステーションの軌道上での宇宙線観測装置CALETのトリガーレートをモンテカルロシミュレーションによって計算した結果、10GeV以上のエネルギーについては37Hzになることが予想される。また、その他にも検出器の幾何学的因子やエネルギー分解能や角度分解能、そして電子と陽子の選別能力についてのシミュレーション結果も報告した。
Calorimetric Electron Telescope, CALET, is being developed to be on board the Japanese
Experiment Module Exposed Facility, JEM/EF, of the International Space Station, ISS. Major goals of the mission are to search for nearby cosmic ray sources and dark matter by carrying out a precise measurement of the electrons in 1 GeV − 20 TeV and the gamma-rays in 20 MeV − a few TeV. CALET will measure the protons and the nuclei up to 1000 TeV
as well. The main detector is composed of Imaging Calorimeter, IMC, Total Absorption Calorimeter, TASC, Silicon Array, SIA, and Anti-Coincidence Detector, ACD, to detect various kinds of particles in very wide energy range. The total absorber thickness
is 31 X0 for electromagnetic particles and 1.4¸ for protons. To get optimized CALET performance in observing each kind of particles, we have been carrying out Monte Carlo simulation. In this paper, we estimate the trigger rate at the ISS orbit by calculating the cosmic ray flux at an altitude of 400 km. The rate is 37 Hz for the shower trigger over 10 GeV, which is mainly adopted in the CALET mission. An expected performance of detector such as the geometrical factor, the energy resolution, the angular resolution and the electron/proton separation is also presented.