SMILE-2+: The 2018 balloon flight and the instrument design of the electron-tracking Compton camera

Y. Nakamura, T. Tanimori, A. Takada, Y. Mizumura, S. Komura, T. Kishimoto, T. Takemura, K. Yoshikawa, T. Tanigushi, K. Onozaka, K. Saito, T. Mizumoto, S. Sonoda, H. Kubo, Y. Matsuoka, Y. Nakamasu, S. Kurosawa, K. Miuchi, T. Sawano

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


To establish imaging spectroscopy of cosmic gamma-rays from a few hundreds of keV to a few tens MeV, we developed an electron-tracking Compton camera (ETCC). The ETCC consists of a time projection chamber (TPC) and pixelated scintillator arrays (PSAs). The ETCC is superior to conventional gamma-ray imaging detectors of this energy band in that the arrival direction of an incident gamma-ray is firmly determined at one point and realizes high noise rejection efficiency. We performed a campaign to demonstrate the gamma-ray imaging performance of the ETCC at balloon altitude via the sub-MeV gamma-ray imaging loaded-on-balloon experiment 2+ (SMILE-2+). The balloon was launched on April 7, 2018, at 6:26 ACST (UTC +9:30) from Alice Springs, Australia. We performed a level flight for 26 hours at an altitude of 39.6 km. The main observation targets were the Galactic Center region and the Crab Nebula and we succeeded in observing them without any critical problems. The configuration of the flight model ETCC and the housekeeping data are described in detail.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2018
Subtitle of host publicationUltraviolet to Gamma Ray
EditorsShouleh Nikzad, Jan-Willem A. Den Herder, Kazuhiro Nakazawa
ISBN (Print)9781510619517
Publication statusPublished - 2018
EventSpace Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray - Austin, United States
Duration: 2018 Jun 102018 Jun 15

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherSpace Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Country/TerritoryUnited States


  • Cameras
  • Compton scattering
  • Gamma-ray astronomy
  • Scintillators
  • Telescopes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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