| Project/Area Number |
23K13690
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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 |
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Principal Investigator |
VU THEDANG 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) |
2023-04-01 – 2025-03-31
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| Project Status |
Granted (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 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | Neutron detector / CBKID / Neutron image / Kalliope / spatial resolution / Time resolution / Superconducting sensor / Positional resolution / Detection efficiency / Fast readout circuit |
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| Outline of Research at the Start |
We aim at realizing a sub-micrometer resolution with a novel 8ch current-biased kinetic inductance detector (CB-KID). We improve the CB-KID readout circuit to resolve timestamps at 30ps clock to enhance a spatial resolution. We plan to realize various fruitful applications.
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| Outline of Annual Research Achievements |
This project aims to develop sub-micrometer resolution neutron image with a novel 8 channels current-biased kinetic inductance detector (CB-KID) system. In fiscal 2023, we succeeded in stabilizing an operating temperature at 5K ±70uK. This improved a spatial resolution of neutron transmission image down to 10um when the sample was installed at low temperature and it was 24um when the sample was placed at room temperature [1,2]. This also reduces a difference of spatial resolution between central region and surrounding region in the detector. A temporal resolution of time-to-digital convertor (TDC) strongly influences to a spatial-resolution neutron image in the delay-line CB-KID. We built a new TDC system named as Kalliope-II. A temporal resolution was estimated withing +/-150ps. This is much better than the previous readout circuit (named as Kalliope-I). Data acquisition (DAQ) program and data analysis program were updated to deal with new system. A quasi-on-line monitor imaging becomes possible during imaging experiments. The 8ch CB-KID is under development. We plan to proceed the experiments in the next fiscal year.
[1] T. Ishida, T.D. Vu et al., J Low Temp Phys (2024) 214:152-157.
[2] T.D. Vu et al., J Phys: Conf Ser 2545 (2023) 012019.
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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
Neutron transmission imaging by using CB-KID showed the resolution of 10um. This is one of the best in using the counting type neutron detector. We developed the new 30ps readout circuit to extract the best performance of the CB-KID system. The DAQ program became possible to give a quasi-online image monitoring. This is in good accordance with our plan.
We suppose that our project has been processed rather smoothly.
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| Strategy for Future Research Activity |
In fiscal 2024, (1) we will continue to optimize the new Kalliope-II readout circuit including firmware update of the Kalliope-II readout circuit. (2) We plan to compare the results of 30-ps Kalliope-II measurements and the results of 1000-ps Kalliope-I measurements by doing simultaneous measurements for mutual comparisons. (3) We start the testing of the 8ch CB-KID detector using the Kalliope-II circuit. (4) Measurement and analysis programs will be updated to deal with the 8ch CB-KID data. (5) The 8 channels neutron detectors will be screened systematically by low temperature experiments using liquid helium and low-temperature probe designed for the CB-KID detectors. This can be done without neutron beams. (6) The standard Gd Siemens-star sample will be tested either at low temperature or at room temperature to achieve the best resolution. We summarize the project.
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