New readout and data-acquisition system for reducing dead time in the Gamma Ray Compton Telescope

K. Yoshikawa, T. Tanimori, A. Takada, T. Mizumoto, Y. Mizumura, S. Komura, T. Kishimoto, T. Takemura, Y. Nakamasu, T. Taniguchi, Y. Nakamura, H. Kubo, T. Sawano, K. Nakamura, S. Sonoda, K. Miuchi, S. Kurosawa, J. D. Parker

研究成果: Conference contribution

抄録

For MeV gamma-ray astronomy, We have developed an electron-tracking Compton camera (ETCC) as a next generation satellite telescope. Our detector consists of a Comptonscattering target and a scattered gamma-ray absorber. The target is a gaseous Time Projection Chamber (TPC), which uses \mu PIC as the 2-dimensional readout detector, and the absorber is position sensitive scintillation arrays (PSAs). We developed a prototype ETCC and certificated its performance in a groundbased experiment. The prototype ETCC had a sharp PSF of 15° included 50%, 662 keV) at the ARM of 5° and the SPD of 100°. We plan to update the prototype ETCC and observe the electronpositron annihilation line of the galactic center in Australia in early 2018 (SMILE-II +). In the data acquisition (DAQ) system of the prototype ETCC, the dead time is estimated to be \sim 20 % at the trigger rate of \sim 100 Hz in a balloon observation, and the prototype ETCC can work. The SMILE-II + ETCC can also work at the balloon altitude. On the other hand, in the future observation with the ETCC, that has a larger effective area than the effective area of SMILE-II + ETCC, the DAQ rate is expected to be \sim~1 kHz. The dead time gets saturation due to sending data via VME bus and common start system in PSA. To overcome the two problem, we develop a new TPC readout board and a PSA readout unit. We create a test model ETCC which have the new TPC readout boards and the new PSA readout units. Although the dead time is \sim 20 % at 30 Hz with a small ETCC in the prototype DAQ system, the dead time is \sim 20 % at 2 kHz in the new system.

本文言語English
ホスト出版物のタイトル2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781538622827
DOI
出版ステータスPublished - 2018 11 12
イベント2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Atlanta, United States
継続期間: 2017 10 212017 10 28

出版物シリーズ

名前2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings

Other

Other2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017
国/地域United States
CityAtlanta
Period17/10/2117/10/28

ASJC Scopus subject areas

  • 器械工学
  • 放射線学、核医学およびイメージング
  • 核物理学および高エネルギー物理学

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