| 研究課題/領域番号 |
22K14054
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分15020:素粒子、原子核、宇宙線および宇宙物理に関連する実験
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| 研究機関 | 大学共同利用機関法人高エネルギー加速器研究機構 |
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研究代表者 |
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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| 研究期間 (年度) |
2022-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,550千円 (直接経費: 3,500千円、間接経費: 1,050千円)
2023年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
2022年度: 3,380千円 (直接経費: 2,600千円、間接経費: 780千円)
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| キーワード | TES bolometers / CMB polarimetry / Cosmology / Superconductivity / Transition Edge Sensors / Bolometers / CMB |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
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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| 今後の研究の推進方策 |
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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