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Improvement of duty cycle of KAGRA for the next generation gravitational wave astronomy

Research Project

Project/Area Number 20H00152
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kajita Takaaki  東京大学, 宇宙線研究所, 教授 (40185773)

Co-Investigator(Kenkyū-buntansha) 山本 尚弘  東京大学, 宇宙線研究所, 助教 (00796237)
宮川 治  東京大学, 宇宙線研究所, 准教授 (90532680)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥45,240,000 (Direct Cost: ¥34,800,000、Indirect Cost: ¥10,440,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2020: ¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Keywords重力波 / 重力波天文学 / 重力波検出 / 精密測定 / 制御 / 干渉計 / 重力波天文楽 / 信号取得 / 精密計測 / 重力波検出実験 / レーザー干渉計
Outline of Research at the Start

日本の大型重力波検出器KAGRAを、重力波の常時観測施設として稼働させることを目的とする。KAGRAの設計時にはあまり問題とは思われなかった、非定常雑音による重力波信号の乱れや制御信号分解能の不足は、KAGRAの性能や安定度を制限すると考えられるようになってきた。特に制御系信号の精度、データ取得の信号数を大幅に改善することにより、KAGRAの稼働率を上げ、重力波天文学時代の到来に耐えうるような、安定した重力波検出を目指す。

Outline of Final Research Achievements

In this study, we have significantly improved the signal input/output interface, which is the front-end of the control and data acquisition systems of KAGRA, the Japanese large cryogenic gravitational wave detector. Specifically, we demonstrated the possibility of reducing noise caused by increasing the resolution of the control signals from 16 bits to 20 bits. Since the sensitivity of KAGRA is not yet limited by the output resolution, it has not yet been installed on KAGRA. Therefore, we do not see obvious effects in the international observation O4 starting in 2023; The sensitivity of KAGRA is continuously being improved, 20-bit control will be a key technology for the next observation O5, as the sensitivity is expected to be limited by control output noise.

Academic Significance and Societal Importance of the Research Achievements

本研究により、KAGRA本体の制御信号を改善することで、重力は検出に対する感度や安定性が将来向上することが見込まれ、将来の重力波の検出頻度が上がる可能性が示された。実際には、現在のKAGRAの感度はまだ想定したレベルに達していないため2023年度から始まる国際観測では効果がはっきりとは出る可能性は低いが、2026年頃に始まる次期観測までにはKAGRAの感度も出力制御信号に制限される可能性が極めて高くなる。今回製作した新型の信号入出力モジュール及びその他回路群、ソフトウェア群は、すでに一部使われ始めていて、今後の機器の安定性や観測率の向上が期待される。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report
  • Research Products

    (10 results)

All 2022 2020 Other

All Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Remarks (4 results)

  • [Journal Article] Input optics systems of the KAGRA detector during O3GK2022

    • Author(s)
      Akutsu T., et al., (The KAGRA Collaboration)
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2023 Issue: 2 Pages: 166-166

    • DOI

      10.1093/ptep/ptac166

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Performance of the KAGRA detector during the first joint obserbation with GEO600 (O3GK)2022

    • Author(s)
      H. Abe, H. Shinkai, KAGRA collaboration
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: ptac93 Issue: 10 Pages: 093-093

    • DOI

      10.1093/ptep/ptac093

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Compact integrated optical sensors and electromagnetic actuators for vibration isolation systems in the gravitational-wave detector KAGRA2020

    • Author(s)
      Tomotada Akutsu et al.
    • Journal Title

      Review of Scientific Instruments

      Volume: 91 Issue: 11 Pages: 115001-115001

    • DOI

      10.1063/5.0022242

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Overview of KAGRA: Detector design and construction history2020

    • Author(s)
      A. Akutsu, H. Shinkai, KAGRA collaboration
    • Journal Title

      Progress of Theoretical Experimental Physics

      Volume: ptaa125 Issue: 5 Pages: 1-24

    • DOI

      10.1093/ptep/ptaa125

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An arm length stabilization system for KAGRA and future gravitational-wave detectors2020

    • Author(s)
      Akutsu T, et al. (KAGRA Collaboration)
    • Journal Title

      Classical and Quantum Gravity

      Volume: 37 Issue: 3 Pages: 035004-035004

    • DOI

      10.1088/1361-6382/ab5c95

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Overview of KAGRA : KAGRA science2020

    • Author(s)
      A. Akutsu, H. Shinkai, KAGRA collaboration
    • Journal Title

      Progress of Theoretical Experimental Physics

      Volume: ptaa120 Issue: 5 Pages: 1-68

    • DOI

      10.1093/ptep/ptaa120

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Remarks] KAGRA大型低温重力波望遠鏡

    • URL

      https://gwcenter.icrr.u-tokyo.ac.jp

    • Related Report
      2022 Annual Research Report
  • [Remarks] KAGRA wiki

    • URL

      http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] KAGRA Digital System Subgroup

    • URL

      http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/DGS

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] KAGRA 大型低温重力波望遠鏡

    • URL

      https://gwcenter.icrr.u-tokyo.ac.jp

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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