Scintillating fiber calorimeter as a detector for the observation of GeV cosmic gamma rays

Shoji Torii, Katsnaki Kasahara, Tadayoshi Doke, T. Kashiwagi, J. Kikuchi, H. Murakami, A. Nakamoto, T. Yuda, Kimiaki Masuda, Y. Muraki, V. V. Akimov, N. G. Leikov

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


A scintillating fiber sampling calorimeter telescope (SSCT) is proposed, which is to be operated on board a satellite for the observation of cosmic γ rays ranging from 200 MeV to 200 GeV. The merit of using scintillating fibers is that the area can be enlarged more than 2 m2 without any particular technical difficulty within a reasonable payload limit of a satellite. Detectors with an effective area which is one order of magnitude larger than EGRET can be made with a lower cost. SSCT consists of a target part and a main part which are separated by 60 - 70 cm. A γ ray which enters the target is converted into a pair of electrons which in turn develop into an electron-photon cascade. The cascade is observed in the main part being a calorimeter with imaging capability. Direction of the γ ray is measured by pointing the energy-weighted centers observed in the two parts. We use 2 mm square fibers which are bundled into a 2 mm thick flat belt to detect the shower particles. A pair of such belts crossing with a right angle is inserted between lead plates. Simulation study and test experiments with accelerator beams show the energy resolution of the calorimeter is 20%/√E(GeV) below a few GeV and becomes worse in a higher energy region to reach 24% at 100 GeV. The angular resolution is 1.6° at 1 GeV and 0.34° at 10 GeV.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Place of PublicationBellingham, WA, United States
PublisherPubl by Int Soc for Optical Engineering
Number of pages11
ISBN (Print)0819409073
Publication statusPublished - 1992
Externally publishedYes
EventGamma-Ray Detectors - San Diego, CA, USA
Duration: 1992 Jul 231992 Jul 24


OtherGamma-Ray Detectors
CitySan Diego, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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