The CALET mission on international space station

S. Torii, Waseda University
T. Tamura, Kanagawa University
N. Tateyama, Kanagawa University
K. Hibino, Kanagawa University
T. Yuda, Kanagawa University
K. Yoshida, Kanagawa University
K. Kashiwagi, Kanagawa University
S. Okuno, Kanagawa University
J. Nishimura, JAXA Institute of Space and Astronautical Science
T. Yamagami, JAXA Institute of Space and Astronautical Science
Y. Saito, JAXA Institute of Space and Astronautical Science
H. Fuke, JAXA Institute of Space and Astronautical Science
M. Takayanagi, JAXA Institute of Space and Astronautical Science
H. Tomida, JAXA Institute of Space and Astronautical Science
S. Ueno, JAXA Institute of Space and Astronautical Science
F. Makino, Japan Aerospace Exploration Agency
M. Shibata, Yokohama National University
Y. Katayose, Yokohama National University
S. Kuramata, Hirosaki University
M. Ichimura, Hirosaki University
Y. Uchihori, National Institute of Radiological Sciences Chiba
H. Kitamura, National Institute of Radiological Sciences Chiba
K. Kasahara, Shibaura Institute of Technology
H. Murakami, Rikkyo University
T. Kobayashi, Aoyama Gakuin University
Y. Komori, Kanagawa University of Human Services
K. Mizutani, Saitama University
T. Terasawam, The University of Tokyo
R. E. Streitmatter, NASA Goddard Space Flight Center
J. W. Mitchell, NASA Goddard Space Flight Center
L. M. Barbier, NASA Goddard Space Flight Center
A. A. Moiseev, NASA Goddard Space Flight Center
J. F. Krizmanic, Universities Space Research Association

Abstract

The CALorimetric Electron Telescope (CALET) mission is proposed for the observation of various components of cosmic-rays as well as ?-rays on the Exposure Facility of the Japanese Experiment Module ( EF/JEM ) on the International Space Station (ISS). The detector is composed of an imaging calorimeter of scintillating fibers (IMC), a total absorption calorimeter of BGO (TASC) and a silicon pad module at the top of IMC . The total thickness of absorber is 36 r.l for the electromagnetic particles and 1.8 m.f.p for protons. The total weight of the payload, including the detector, the support, the interface instruments with JEM so on, is nearly 2,500 kg and the geometrical factor for the electrons is about 1 m2 sr. The CALET has a unique capability to measure electrons and ?-rays beyond 1 TeV since the hadron rejection power is 106. The energy resolution for the electro-magnetic particles is better than a few % above 100 GeV. The detector is optimally designed to detect changes in the energy spectra caused by physical processes, or a line signature in the energy distribution expected from annihilations of dark matter candidates. This paper is the first presentation by the international team of the CALET collaboration.