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大型低温重力波望遠鏡KAGRAのための圧搾真空源の開発、導入及び検証

Research Project

Project/Area Number 20F20803
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

LEONARDI MATTEO  国立天文台, 重力波プロジェクト, 特別客員研究員 (90816448)

Co-Investigator(Kenkyū-buntansha) EISENMANN MARC  国立天文台, 重力波プロジェクト, 外国人特別研究員
Project Period (FY) 2020-11-13 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2020: ¥400,000 (Direct Cost: ¥400,000)
KeywordsKAGRA / filter cavity / freq. dep. squeezing / sapphire / optical absorption / birefringence / liquid crystals
Outline of Research at the Start

Gravitational wave (GW) astronomy has became a mature research field. At five years from the first detection of a GW, almost one hundred more have been detected. To keep pushing this trend, the GW detectors need to be improved. In particular, for the Japanese detector KAGRA, the main limitation is its quantum noise. Dr. Eisenmann, together with the TAMA Filter Cavity team members, will design and and implement a quantum noise suppression system in KAGRA using frequency dependent squeezed state of light. He will also contribute to the commissioning of KAGRA interferometer.

Outline of Annual Research Achievements

From April 2022, Dr. Eisenmann participated to the characterization and improvement of the Filter Cavity (FC) optical losses and design of the frequency dependent squeezing setup to be implemented in KAGRA in future runs. He performed several simulations on to optimize the FC's mirror properties in order to fit the KAGRA's requirement and also contributed in a major way in the design of the intermediate optics that will be crucial for the injection of frequency independent squeezing in the FC and from the FC to the interferometer.
He also was a key member for the characterization of sapphire substrates and in the development of novel techniques to not only perform faster and more accurate characterization of the birefringence of sapphire but also to mitigate the effect of such birefringence in the automatic alignment system of KAGRA. On the development of novel characterization system, he in the first place optimized the already existing linear polarimeter, and then autonomously developed a novel technique based on liquid crystal technology. With such setup, currently under testing at NAOJ, samples as large as KAGRA mirrros will be characterized within one day, without loosing any precision compared to the current method. It is to be noted that current setup requires more than one week to perform the characterization, and this could become a problem in the future when the size of the test masses will be increased.

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。

Report

(3 results)
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (5 results)

All 2023 2022

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Invited: 1 results)

  • [Journal Article] Improving the stability of frequency-dependent squeezing with bichromatic control of filter cavity length, alignment, and incident beam pointing2022

    • Author(s)
      Zhao Y.、Capocasa E.、Eisenmann M.、Aritomi N.、Page M.、Guo Y.、Polini E.、Arai K.、Aso Y.、van Beuzekom M.、Huang Y.-C.、Lee R.-K.、Lueck H.、Miyakawa O.、Prat P.、Shoda A.、Tacca M.、Takahashi R.、Vahlbruch H.、Vardaro M.、Wu C.-M.、Leonardi M.、Barsuglia M.、Flaminio R.
    • Journal Title

      Physical Review D

      Volume: 105 Issue: 8

    • DOI

      10.1103/physrevd.105.082003

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Some updates on KAGRA MIR activities2023

    • Author(s)
      M. Eisenmann
    • Organizer
      LIGO Virgo KAGRA meeting
    • Related Report
      2022 Annual Research Report
  • [Presentation] Novel characterization setup for KAGRA mirrors2023

    • Author(s)
      M. Eisenmann
    • Organizer
      iLANCE
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Characterization of KAGRA new ITM substrates2022

    • Author(s)
      M. Eisenmann
    • Organizer
      KAGRA F2F
    • Related Report
      2022 Annual Research Report
  • [Presentation] Update on characterization of KAGRA new ITM substrates2022

    • Author(s)
      M. Eisenmann
    • Organizer
      LIGO Virgo KAGRA meeting
    • Related Report
      2022 Annual Research Report

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Published: 2020-11-16   Modified: 2024-03-26  

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