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2023 Fiscal Year Annual Research Report

Improving the gamma-ray detection sensitivity of the Cherenkov Telescope Array to discover dark matter and Galactic PeVatrons

Research Project

Project/Area Number 18KK0384
Research InstitutionNagoya University

Principal Investigator

奥村 曉  名古屋大学, 宇宙地球環境研究所, 講師 (90645011)

Project Period (FY) 2019 – 2023
Keywords宇宙線物理学 / ガンマ線天文学 / 半導体光検出器
Outline of Annual Research Achievements

本研究では2つの研究活動を進めた。1つ目はドイツのマックスプランク核物理学研究所(MPIK)との共同研究により半導体光検出器SiPMを用いたガンマ線望遠鏡用の焦点面カメラを開発することである。次世代の地上ガンマ線望遠鏡計画CTAの小口径望遠鏡でこの焦点面カメラを使用することにより、銀河系内の宇宙線加速天体の発見が期待されている。本研究ではMPIKへの長期滞在を3回に渡り実施し、焦点面カメラ試作機の性能試験、ソフトウェア開発を国際共同で行った。また名古屋大学では焦点面カメラの構成要素、特に半導体光検出器の性能試験やシミュレーションを行った。2つ目の研究は、CTAの大口径望遠鏡によるガンマ線観測およびMAGIC望遠鏡によるガンマ線観測である。この目的のため、スペイン・ラパルマ島に設置されている両望遠鏡の観測に参加した。またコロナ禍の間は海外研究機関への渡航が制限されたため、研究費の一部を技術補佐員の雇用経費にすることで実験室で進められる装置性能評価などを行った。またラパルマ島への渡航の代わりにオンラインによるガンマ線観測体制の構築を進め、長期出張の代替手段として研究遂行を継続した。以上の研究により、CTA小口径望遠鏡の焦点面カメラの設計や性能評価を終え、試作機開発の段階から量産の直前の段階にまで技術開発を進めることができた。このうち2023年度は、月光下でのガンマ線観測を見据えた大光量下でのSiPMの特性評価、多層膜コーティングを用いた大気チェレンコフ光の集光性能向上、CTA小口径望遠鏡の光学系シミュレーション、ガンマ線観測データの新しい解析手法の提案など、国際会議や物理学会などで成果報告を行った。

  • Research Products

    (24 results)

All 2024 2023 2020 2019

All Int'l Joint Research (2 results) Journal Article (14 results) (of which Int'l Joint Research: 14 results,  Peer Reviewed: 11 results,  Open Access: 14 results) Presentation (8 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] ロケ・デ・ロス・ムチャーチョス天文台(スペイン)2020

    • Year and Date
      2020-02-10 – 2020-02-25 | 2023-03-052023-03-22
    • Country Name
      SPAIN
    • Counterpart Institution
      ロケ・デ・ロス・ムチャーチョス天文台
    • Co-investigator Overseas
      Daniel Mazin
    • Job Title
      准教授
  • [Int'l Joint Research] マックスプランク核物理学研究所(ドイツ)2019

    • Year and Date
      2019-07-20 – 2019-08-31 | 2022-08-072022-09-18 | 2023-08-062023-08-14
    • Country Name
      GERMANY
    • Counterpart Institution
      マックスプランク核物理学研究所
    • Co-investigator Overseas
      Jim Hinton
    • Job Title
      所長
  • [Journal Article] Silicon photomultipliers for the SST camera of the Cherenkov Telescope Array2024

    • Author(s)
      Depaoli D.、Lapington J.、Leach S.、Okumura A.、Sofia I.、Tajima H. et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 1060 Pages: 169047~169047

    • DOI

      10.1016/j.nima.2023.169047

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multi-year characterisation of the broad-band emission from the intermittent extreme BL Lac 1ES 2344+5142024

    • Author(s)
      MAGIC Collaboration
    • Journal Title

      Astronomy & Astrophysics

      Volume: 682 Pages: A114~A114

    • DOI

      10.1051/0004-6361/202347845

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] MAGIC detection of GRB 201216C at z = 1.12023

    • Author(s)
      Abe H, Okumura A., et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 527 Pages: 5856~5867

    • DOI

      10.1093/mnras/stad2958

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data2023

    • Author(s)
      Abe H., Okumura A., et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 680 Pages: A66~A66

    • DOI

      10.1051/0004-6361/202346927

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Star tracking for pointing determination of Imaging Atmospheric Cherenkov Telescopes2023

    • Author(s)
      Abe K, Okumura A.,. et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 679 Pages: A90~A90

    • DOI

      10.1051/0004-6361/202347128

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Observations of the Crab Nebula and Pulsar with the Large-sized Telescope Prototype of the Cherenkov Telescope Array2023

    • Author(s)
      Abe H., Okumura A., et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 956 Pages: 80~80

    • DOI

      10.3847/1538-4357/ace89d

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud2023

    • Author(s)
      Acharyya A, Okumura A., et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 523 Pages: 5353~5387

    • DOI

      10.1093/mnras/stad1576

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sensitivity of the Cherenkov Telescope Array to spectral signatures of hadronic PeVatrons with application to Galactic Supernova Remnants2023

    • Author(s)
      Acero F, Okumura A.,. et al.
    • Journal Title

      Astroparticle Physics

      Volume: 150 Pages: 102850~102850

    • DOI

      10.1016/j.astropartphys.2023.102850

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multimessenger Characterization of Markarian 501 during Historically Low X-Ray and γ-Ray Activity2023

    • Author(s)
      Abe H., Okumura A., et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 266 Pages: 37~37

    • DOI

      10.3847/1538-4365/acc181

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multiwavelength study of the galactic PeVatron candidate LHAASO J2108+51572023

    • Author(s)
      Abe S., Okumura A., et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 673 Pages: A75~A75

    • DOI

      10.1051/0004-6361/202245086

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Studies of propagation mechanism of optical crosstalk in silicon photomultipliers2023

    • Author(s)
      Tajima H.、Okumura A.、Furuta K.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 1049 Pages: 168029~168029

    • DOI

      10.1016/j.nima.2023.168029

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of a blue-mirror multilayer coating on light concentrators for future SiPM cameras2023

    • Author(s)
      Okumura Akira、Haga Junya、Inoue Chiaki、Nishimoto Keiji、Furuta Kazuhiro、Tajima Hiroyasu
    • Journal Title

      Proceedings of the 38th International Cosmic Ray Conference

      Volume: - Pages: -

    • DOI

      10.22323/1.444.0673

    • Open Access / Int'l Joint Research
  • [Journal Article] Study on the gain and photon detection efficiency drops of silicon photomultipliers under bright background conditions2023

    • Author(s)
      Okumura Akira、Wakazono Kawori、Furuta Kazuhiro、Tajima Hiroyasu
    • Journal Title

      Proceedings of the 38th International Cosmic Ray Conference

      Volume: - Pages: -

    • DOI

      10.22323/1.444.0674

    • Open Access / Int'l Joint Research
  • [Journal Article] Evaluation of the effective mirror area of CTA Small-Sized Telescopes for camera design and Monte Carlo simulation2023

    • Author(s)
      Okumura Akira、Ross Duncan、G. Saturni Francesco、Sironi Giorgia、White Richard
    • Journal Title

      Proceedings of the 38th International Cosmic Ray Conference

      Volume: - Pages: -

    • DOI

      10.22323/1.444.0675

    • Open Access / Int'l Joint Research
  • [Presentation] CTA 報告 225 : 小口径望遠鏡用 64 チャ ンネル SiPM の暗電流の安定性試験 (2)2024

    • Author(s)
      河原崎琉
    • Organizer
      日本物理学会2024年春季大会
  • [Presentation] CTA 報告 215:小口径望遠鏡の開発状況2023

    • Author(s)
      奥村曉
    • Organizer
      日本物理学会第78回年次大会
  • [Presentation] CTA報告 216:小口径望遠鏡用64チャンネルSiPMの暗電流の安定性試験2023

    • Author(s)
      河原崎琉
    • Organizer
      日本物理学会第78回年次大会
  • [Presentation] CTA 報告 217: 最尤法を用いたCTA小口径望遠鏡の角度分解能の向上の検証2023

    • Author(s)
      バンソンヒョン
    • Organizer
      日本物理学会第78回年次大会
  • [Presentation] CTA 小口径望遠鏡の開発状況2023

    • Author(s)
      奥村曉
    • Organizer
      日本天文学会2023年秋季年会
  • [Presentation] Evaluation of the effective mirror area of CTA Small-Sized Telescopes for camera design and Monte Carlo simulation2023

    • Author(s)
      Akira Okumura
    • Organizer
      The 38th International Cosmic Ray Conference
    • Int'l Joint Research
  • [Presentation] Development of a blue-mirror multilayer coating on light concentrators for future SiPM cameras2023

    • Author(s)
      Akira Okumura
    • Organizer
      The 38th International Cosmic Ray Conference
    • Int'l Joint Research
  • [Presentation] Study on the gain and photon detection efficiency drops of silicon photomultipliers under bright background conditions2023

    • Author(s)
      Akira Okumura
    • Organizer
      The 38th International Cosmic Ray Conference
    • Int'l Joint Research

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Published: 2024-12-25  

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