| Project/Area Number |
21K14566
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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 31010:Nuclear engineering-related
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| Research Institution | Osaka Metropolitan University (2022-2023)
Osaka Prefecture University (2021) |
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Principal Investigator |
VU THE DANG 大阪公立大学, 大学院工学研究科, 特任助教 (60826121)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Completed (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 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | Neutron detector / CB-KID / Neutron pulse / Neutron image / Superconducting sensor / Positional resolution / Detection efficiency / Fast readout circuit / Wood's metal / Temperature stability / Spatial resolution / Bragg-edges / Bragg-dips / Fast neutron / Neutron imaging / Superconducting detector / Operating principle / Readout circuit |
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| Outline of Research at the Start |
This project aims at understanding the operating principle of a 4-CH delay line current-biased kinetic inductance detector (CB-KID) system. Since this detector is very different from any other existing neutron detectors, we need deeper understanding for the physical basis. The nuclear reaction 10B(n,alpha)7Li creates a hot spot in a superconducting Nb nanowire under the dc bias current. A coordinate (X,Y) of the hot spot is obtained by using time differences in signal arrival timestamps to obtain neutron image.
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| Outline of Final Research Achievements |
This project achieved the following things. (1) Stabilization of temperature was achieved as T = 5K +/- 73uK. Spatial resolution becomes better due to propagation velocity stability. (2) We built a new cryostat to mount a
sample at room temperature. (3) We achieved the best resolution of 10um for a cryogenic-temperature sample and 24um for a room-temperature sample. (4) We can conduct the energy-resolving spectroscopy from 1meV to 500keV. (5) We conducted neutron transmission imaging using various interesting samples. References: [1] T. Ishida, T.D. Vu, at al., J. Low Temp. Phys. 214, 152 (2024).
[2] T.D. Vu, et al., Invited talks at 4th ICEBA2023 (Dec 8th 2023, HCM, Vietnam). [3] T.D. Vu et al., J. Phys. Conf. Ser. 2545, 012019 (2023). [4] H. Shishido, T.D. Vu, et al., J. Appl. Cryst. 56, 1108-1113 (2023).
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| Academic Significance and Societal Importance of the Research Achievements |
Our CB-KID method can be used for many scientific/industrial purposes such as (1) hydrogen embrittlement of steel, (2) imaging plant-soil systems, (3) water dynamics in cells, (4) magnetic domains in magnetism, (5) water removal efficiency from fuel cells, (5) ionic pulsation in Li batteries.
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