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

*Corresponding author for this work

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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