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2022 Fiscal Year Annual Research Report

Comprehensive Understanding of Galactic and Extragalactic Cosmic-ray Acceleration by Exploring Gamma-ray Observations beyond 100 TeV

Research Project

Project/Area Number 20H01916
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) 2020-04-01 – 2023-03-31
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

2023年度は、半導体光検出器(SiPM)を用いた地上ガンマ線望遠鏡の焦点面カメラの製作とそれを用いた望遠鏡の実現に向け、SiPMの長期性能試験、光学系シミュレーション、また光電子増倍管を用いた焦点面カメラをSiPMに置き換えるアップグレードに関する研究を主に行った。長期性能試験では64チャンネルのSiPMの暗電流を長期に渡り測定し、温度変化に起因しない、突発的な暗電流の増大や減少が起きることを明らかにした。また暗電流が通常より大きいチャンネルでは測定のフォトダイオードが発光していることを突き止め、異常な振る舞いをするいくつかのフォトダイオードが暗電流変化の原因であることを明らかにした。光学系シミュレーションでは望遠鏡の詳細なシミュレーションモデルを作成し、焦点面カメラとの組み合わせにおける有効面積の計算を行った。従来の光電子増倍管を用いた焦点面カメラのアップグレードの計画では、光電子増倍管に異なる波長の光を照射して光検出能力の比較を行い、多層膜反射コーティングの性能評価は、光検出能力の測定系の整備を行った。これら成果は第38回宇宙線国際会議(ICRC2023)でも発表を行った。

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

  • Research Products

    (24 results)

All 2024 2023 Other

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] レスター大学/オックスフォード大学(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      レスター大学/オックスフォード大学
  • [Int'l Joint Research] マックスプランク核物理学研究所/マックスプランク物理学研究所/DESY(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      マックスプランク核物理学研究所/マックスプランク物理学研究所/DESY
  • [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.
    • 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)
      Abe H.、Okumura A. et al.
    • 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: NA Pages: NA

    • 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: NA Pages: NA

    • 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: NA Pages: NA

    • 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
      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
      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
      38th International Cosmic Ray Conference
    • Int'l Joint Research

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Published: 2024-12-25  

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