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Addressing the impact of non-linearity in superconductive bolometers to test cosmological inflation from space with a CMB polarimeter

Research Project

Project/Area Number 22K14054
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 InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

Ghigna Tommaso  大学共同利用機関法人高エネルギー加速器研究機構, 量子場計測システム国際拠点, 特任助教 (60904711)

Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
KeywordsCMB / Transition-edge sensor / B-mode / Inflation / TES bolometers / CMB polarimetry / Cosmology / Superconductivity / Transition Edge Sensors / Bolometers
Outline of Research at the Start

The research plan consists in building a holder for LiteBIRD detector wafers, increasing the present test-bed output and characterizing the response of TES detectors fabricated for LiteBIRD. I will implement two key tests: characterization of the TES resistance and simulated optical loading tests.
This analysis will be complemented by simulations using a code I personally developed to simulate the detector response. The code is already being expanded to propagate realistic detector response to real LitBIRD data simulations to study these effects in terms of deliverable scientific output.

Outline of Annual Research Achievements

Most of the past year research has been devoted to the design of new TES bolometers for the low frequency end of the spectrum for CMB observations (<100 GHz). The first iteration of fabrication is now ongoing and a first batch of detectors is expected for early JFY 2024.
In parallel I have focused on implementing various tools for science forecasting that take into account systematic effects and to attempt to mitigate them with several collaborators. A handful of papers have been written (or are in an advanced state) on various topics related to detector non-linearity, HWP non-idealities, detector gain, detector cross-talk, correlated noise and more.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

The research project has been moving ahead rather smoothly and while the pandemic disrupted some activities at the beginning. The impossibility of spending much of the fundings at the beginning has allowed us to focus on different details and freed more resources that can be used in this coming year to boost international collaboration.

Strategy for Future Research Activity

In the coming year I plan to focus on characterizing the detectors that are being fabricated and implement changes to the design for future fabrication iterations. In parallel I want to develop scaled model of some of the critical RF components to test them thoroughly and study possible solutions for improvement.
I will also continue pushing the development of new computational tools for science forecasting, data analysis and systematic effect mitigation.

Report

(2 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Fabrication Process Control to Realize High Yield, Uniform, Repeatable Low-Frequency Detector Arrays for the LiteBIRD CMB Experiment2024

    • Author(s)
      Raum Christopher、Westbrook Benjamin、Beckman Shawn、Elleflot Tucker、Farias Nicole、Ghigna Tommaso、Halverson Nils、Hubmayr Johannes、Hazumi Masashi、Jaehnig Greg、Lee Adrian、Suzuki Aritoki
    • Journal Title

      Journal of Low Temperature Physics

      Volume: 0 Issue: 1-2 Pages: 0-0

    • DOI

      10.1007/s10909-024-03129-7

    • Related Report
      2023 Research-status Report
  • [Journal Article] Impact of half-wave plate systematics on the measurement of CMB B-mode polarization2024

    • Author(s)
      Monelli Marta、Komatsu Eiichiro、Ghigna Tommaso、Matsumura Tomotake、Pisano Giampaolo、Takaku Ryota
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2024 Issue: 05 Pages: 018-018

    • DOI

      10.1088/1475-7516/2024/05/018

    • Related Report
      2023 Research-status Report
  • [Journal Article] Tensor-to-scalar ratio forecasts for extended LiteBIRD frequency configurations2023

    • Author(s)
      Fuskeland U.、Aumont J.、et al
    • Journal Title

      Astronomy &amp; Astrophysics

      Volume: 676 Pages: A42-A42

    • DOI

      10.1051/0004-6361/202346155

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Modelling TES non-linearity induced by a rotating HWP in a CMB polarimeter2023

    • Author(s)
      Tommaso Ghigna
    • Journal Title

      Journal of Low Temperature Physics

      Volume: n/a Issue: 5-6 Pages: 357-365

    • DOI

      10.1007/s10909-023-02939-5

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Testing magnetic interference between TES detectors and the telescope environment for future CMB satellite missions2022

    • Author(s)
      Tommaso Ghigna
    • Journal Title

      SPIE Proceedings

      Volume: 12190 Pages: 167-167

    • DOI

      10.1117/12.2630091

    • Related Report
      2022 Research-status Report
  • [Presentation] Design and optimization of the lowest frequency pixels of LiteBIRD Low Frequency Telescope2023

    • Author(s)
      Tommaso Ghigna
    • Organizer
      LTD
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] LiteBIRD Low Frequency Telescope development and the challenge of searching for CMB B-modes from space2023

    • Author(s)
      Tommaso Ghigna
    • Organizer
      Cardiff University
    • Related Report
      2023 Research-status Report
    • Invited

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Published: 2022-04-19   Modified: 2024-12-25  

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