The balloon-bone CALET prototype detector (bCALET)

Shunsuke Ozawa, Shoji Torii, Katsuaki Kasahara, Hiroyuki Murakami, Yosui Akaike, Yoshitaka Ueyama, Daijiro Ito, Motohiko Karube, Keinosuke Kondo, Tae Niita, Tadahisa Tamura, Yusaku Katayose, Kenji Yoshida, Yoshitaka Saito, Hideyuki Fuke, Jiro Kawada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The CALET payload will be installed in the Japanese Experiment Module Exposed Facility (JEM-EF) of the International Space Station (ISS). We developed a balloon-borne payload to evaluate the performance of CALET by carrying out precursor flights for the electron and gamma-ray observations. The first flight of bCALET-1 (balloon-borne CALET prototype) was carried out in 2006, and the enhanced version, bCALET-2, was successfully flown in August 2009. The bCALET-2 is composed of IMaging Calorimeter (IMC) and Total AbSorption Calorimeter (TASC). The IMC has an area of 256 mm × 256 mm, and is consisted of 8 layers of scintillating fiber belts with a total 3.6 radiation lengths of tungsten plates interleaved within the fiber planes for imaging the pre-shower development. TASC is consisted of crossed BGO logs (25 mm × 25 mm × 300 mm in each) with a total of 13.4 radiation lengths depth, for measuring the total energy deposit of incoming shower particles. The geometry factor is nearly 320 cm2sr over 10 GeV. We succeeded the observation of the electron energy spectrum in 1 GeV ∼ several 10 GeV electron and the atmospheric gamma-rays in 1 GeV ∼ a few 10 GeV, which are consistent with previous observations by BETS. The results are compared with simulations for confirming the detector performance.

Original languageEnglish
Title of host publicationProceedings of the 32nd International Cosmic Ray Conference, ICRC 2011
PublisherInstitute of High Energy Physics
Number of pages4
Publication statusPublished - 2011
Event32nd International Cosmic Ray Conference, ICRC 2011 - Beijing
Duration: 2011 Aug 112011 Aug 18


Other32nd International Cosmic Ray Conference, ICRC 2011


  • Balloon-bone experiment
  • Electron
  • Gamma-ray

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Ozawa, S., Torii, S., Kasahara, K., Murakami, H., Akaike, Y., Ueyama, Y., Ito, D., Karube, M., Kondo, K., Niita, T., Tamura, T., Katayose, Y., Yoshida, K., Saito, Y., Fuke, H., & Kawada, J. (2011). The balloon-bone CALET prototype detector (bCALET). In Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011 (Vol. 6, pp. 71-74). Institute of High Energy Physics.