Addressing the impact of non-linearity in superconductive bolometers to test cosmological inflation from space with a CMB polarimeter
| Project/Area Number |
22K14054
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | High Energy Accelerator Research Organization |
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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)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| 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)
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| Keywords | CMB / Transition-edge sensor / B-mode / Inflation / TES bolometers / CMB polarimetry / Cosmology / Superconductivity / Transition Edge Sensors / Bolometers |
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| 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.
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| 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.
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| 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.
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| 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.
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Report
(2 results)
Research Products
(7 results)
