| Project/Area Number |
22K14060
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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 | Okayama University |
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Principal Investigator |
Stever Samantha 岡山大学, 環境生命自然科学学域, 助教 (20842991)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Discontinued (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2026: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2025: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | phonon mitigation / microwave detector / resonator / MKID / superconductivity / radiation resistance / systematic effects / mm-wave |
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| Outline of Research at the Start |
We will carry out the work first produced by Karatsu et al. (2019) on the development of radiation-resistant MKID arrays. Building upon previous work, we will develop and test multiple low-Tc materials and designs in order to optimise effectiveness and reduce array dead time to <1% that of an unmitigated array, with multiple device types tested. We will optimise the design based on these results and subsequent modelling. By the end of this project we aim to achieve a large array (10,000 detectors) for such a targeted study.
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| Outline of Annual Research Achievements |
During the research period so far, we have collaborated with AIST (Tsukuba) to fabricate several microwave resonator designs with varying low T_c films for phonon absorption. We have characterised these detectors at Okayama University, and also at Paris-Saclay university for an aluminium-backed detector requiring subkelvin cryogenics.
We have produced a microwave circuit at room temperature which allows us to measure two detectors in the time domain simultaneously. We are in the process of using this circuit to measure the co-incidence from laser pulses or radiation, in order to verify the phonon absorption of the thin film.
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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
It is progressing smoothly.
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| Strategy for Future Research Activity |
We plan to produce another aluminium thin film backed device because the current one has an electrical short. Following that, we will characterise its frequency response before irradiating it again in a dilution fridge at KEK (Tsukuba).
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