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Development of Ring Structure Forebaffles that Effectively Reduce Ground Signal Systematics in CMB Telescopes

Research Project

Project/Area Number 20K14483
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionJapan Aerospace EXploration Agency (2021-2022)
The University of Tokyo (2020)

Principal Investigator

Matsuda Frederick  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 特任助教 (40867032)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords宇宙マイクロ波背景放射 / インフレーション / CMB / 光学 / バッフル
Outline of Research at the Start

本研究は宇宙マイクロ波背景放射(CMB)の偏光Bモードの観測を通して、インフレーションの決定的証拠となりうる原始重力波を探る。CMB地上実験における大きな問題は望遠鏡の計測器に入る地形反射による迷光汚染である。この迷光は観測感度を制限する大きな系統誤差である。本研究ではCMB地上実験では新たな試みとなるリングバッフル構造を望遠鏡の外部バッフルとして使用し、迷光による系統誤差の抑制効果を調べる。3年計画にてSimons Observatory望遠鏡にリングバッフルを実装し、実測データと光学シミュレーションに基づきリングバッフルの地形反射抑制効果を計測し、CMB地上実験の飛躍的な感度向上を目指す。

Outline of Final Research Achievements

The main goal of this research is to develop a ring structured forebaffle for ground-based cosmic microwave background (CMB) experiments that can effectively reduce ground signal systematics during observations. Based on optics simulations, we showed that ground signal systematics can be reduced to 0.005% using an optimized ring structured forebaffle. We were also able to identify the various fabrication risks related to structural integrity and cost. Even though we were not able to deploy a ring structured forebaffle in this research, based on our research findings, we developed an improved standard forebaffle for the Simons Observatory small aperture telescope. Through this up-grade development, we were able to mitigate to a certain extent the fabrication risks that were common to both the development of the ring structured forebaffle and improved standard forebaffle. Using a similar design strategy, we aim to deploy a ring structured forebaffle for future CMB telescopes.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、次世代CMB実験において、地形反射により計測器に侵入するシグナル汚染(迷光)をどのように低減するかは大きな課題である点です。高い統計感度を持つ次世代望遠鏡にとって、地形反射は大きな系統誤差となりうるため、望遠鏡のバッフル構造を改良し系統誤差を抑制することは必須である。
そして、望遠鏡の外部バッフルとしてリングバッフル構造を応用するのはCMB地上実験では新たな試みであるため、本成果はリングバッフルの実用に向けた重要な研究開発である。将来的なリングバッフルの実装により、CMB地上実験の飛躍的な感度向上を目指す。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (25 results)

All 2022 2021 2020 Other

All Int'l Joint Research (18 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] University of California Berkeley/University of California San Diego/Princeton University(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Pontificia Universidad Catolica/University of Chile(チリ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] McGill University/University of British Columbia/Dunlap Institute(カナダ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Cardiff University/Imperial College/Cambridge University(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] APC(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of California Berkeley/University of California San Diego/Princeton University(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Pontificia Universidad Catolica/University of Chile(チリ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] McGill University/University of British Columbia/Dunlap Institute(カナダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Cardiff University/Imperial College/Cambridge University(英国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] APC(フランス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of California Berkeley/University of California San Diego/Princeton University(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Pontificia Universidad Catolica/University of Chile(チリ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] McGill University/University of British Columbia/Dunlap Institute(カナダ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Cardiff University/Imperial College/Cambridge University(英国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] APC(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2020 Research-status Report
  • [Journal Article] The Simons Observatory: metamaterial microwave absorber and its cryogenic applications2021

    • Author(s)
      Xu Zhilei、Matsuda Frederick et al.
    • Journal Title

      Applied Optics

      Volume: 60 Issue: 4 Pages: 864-864

    • DOI

      10.1364/ao.411711

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Simons Observatory: modeling optical systematics in the Large Aperture Telescope2021

    • Author(s)
      Gudmundsson Jon E.、Matsuda Frederick et al.
    • Journal Title

      Applied Optics

      Volume: 60 Issue: 4 Pages: 823-823

    • DOI

      10.1364/ao.411533

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Small Aperture Telescopes for the Simons Observatory2020

    • Author(s)
      Ali Aamir M. et al.
    • Journal Title

      Journal of Low Temperature Physics

      Volume: 200 Issue: 5-6 Pages: 461-471

    • DOI

      10.1007/s10909-020-02430-5

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Simons Observatory Small Aperture Telescope overview2020

    • Author(s)
      Kiuchi Kenji et al.
    • Journal Title

      SPIE

      Volume: - Pages: 1372-1379

    • DOI

      10.1117/12.2562016

    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 小口径望遠鏡の受信器を用いた偏光角較正装置スパースワイヤーグリッドの光学性能評価2022

    • Author(s)
      中田嘉信、村田雅彬、飯島健五、安達俊介、木内健司、松田フレドリック、日下暁人、田島治、Simons Observatory Collaboration
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Simons Observatory実験に搭載するワイヤーグリッドを用いた偏光角較正装置の光学試験状況2021

    • Author(s)
      村田雅彬、中田嘉信、飯島健五、安達俊介、清野結大、木内健司、松田フレドリック、日下暁人、田島治、Simons Observatory Collaboration
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Optics Design Development of the Simons Observatory Small Aperture Telescopes2020

    • Author(s)
      Frederick Matsuda
    • Organizer
      SPIE
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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

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