| Project/Area Number |
17340072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Nagoya University |
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Principal Investigator |
IIJIMA Toru Nagoya University, Graduate School of Science, Associate Professor, 大学院理学研究科, 助教授 (80270396)
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| Co-Investigator(Kenkyū-buntansha) |
IKADO Koji Nagoya University, Graduate School of Science, Research Fellow, 大学院理学研究科, 研究員 (40350433)
HARA Koji Nagoya University, Graduate School of Science, Assistant Professor, 大学院理学研究科, 助手 (90432236)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2006: ¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 2005: ¥8,700,000 (Direct Cost: ¥8,700,000)
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| Keywords | Radiation detectors / Silica aerogel / Cherenkov counter / Semiconductor detectors / Particle physics |
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| Research Abstract |
We have developed a Ring-Imaging Cherenkov (RICH) detector using a new novel idea of multi-layer aerogel radiator. A RICH with multi-layer aerogel radiator utilizes the radiator consisting of two or more aerogel layers of different refractive indices, which allows for an increase in Cherenkov photon yield on account of the increase in overall radiator thickness, while avoiding the simultaneous degradation in single photon angular resolution associated with the increased uncertainty of the emission point. The major achievements in this research program are the followings;
1. Proof-of-principle by a beam test
We carried out a beam test at KEK using the radiator consisting of 2 to 4 aerogel layers. We successfully demonstrated that we can increase the Cherenkov photon yields by a factor of 1.5 (from 6 p.e. to 9 p.e.) without deteriorating the single photon angular resolution (about 13mrad). We also carried out a study on the optimization for the combination of refractive index and thickness
… More
of the aerogel layers.
2. Improvement of optical quality of aerogel radiator
We carried out a study on the method to develop monolithic aerogel radiator having two or three internal layers with varying refractive indices. We found that it is possible to produce such radiator having optical quality similar to a single layer aerogel radiator.
3. Study on photodetection
We designed a new photo-sensor consisting of so-called Geiger mode APDs and light-guides. We carried out measurements of some fundamental properties of the "Geiger-mode APD", such as the quantum efficiency, the time resolution and the noise performance. We then evaluated performance of a aerogel-RICH with such a photo-sensor using a detailed Monte Carlo simulation. The simulation indicated that, compared to conventional position-sensitive photomultiplier tubes, the designed photo-sensor can detect Cherenkov photons, produced in upstream aerogel layers, more effectively, and the improvement factor in the Cherenkov photon yield is as high as 4. Less
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