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, 研究員 (60904711)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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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 | TES bolometers / CMB polarimetry / Cosmology / Superconductivity / Transition Edge Sensors / Bolometers / CMB |
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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 |
Concerning the hardware side of this proposal, dark characterization of TES bolometers developed by our colleagues at UC Berkeley is progressing. We have been able to test space-like bolometers and verify the requirements in terms of critical temperature, saturation power and time-constant. A more advanced characterization procedure is being tested and has started producing preliminary results of complex impedance that can complement other methods that make use of multiplexing TES readout.
We have also developed a test-bed to perform TES magnetic sensitivity tests that are necessary to inform the design of magnetic shielding structures for future CMB experiments like LiteBIRD. Results have been presented at international conferences and published as conference proceedings.
The simulation code has been used to produced a forecast of the impact of detector non-linearity on simulated data. Results have been presented at international conferences and published on a peer reviewed journal.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
While the research is progressing rather smoothly, the purchase of new equipment has been slow due to Coronavirus pandemic and supply chain issues. Also due to the pandemic most of the budget that was supposed to be used for business trips has not been used.
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| Strategy for Future Research Activity |
The plan for the coming year is to produce results with the more advanced TES characterization method based on complex impedance measurements. This should give more information to build a better responsively model for TES bolometers.
Since I moved from my original institution (The University of Tokyo) to KEK, I have been working on the design of TES bolometers. I plan to use this opportunity to study the impact of different detector geometries on the TES response.
I have been coordinating a collaborative work among a handful of researchers to implement the simple responsively code into a more advanced simulation tool that can be used for more realistic forecasting work for the LiteBIRD experiment. This will be central in developing a data reduction pipeline that can take into account a realistic instrument model and to develop techniques to mitigate instrumental systematic effects.
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Report
(1 results)
Research Products
(2 results)
