| Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2016: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2015: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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| Outline of Final Research Achievements |
In this project, we worked on developing a system to directly measure coating thermal noise at low temperatures quickly and with high accuracy. Since the first direct detection of gravitational wave, the gravitational
wave astronomy has expanded rapidly. In order to further improve the detector sensitivity, we need to reduce the coating thermal noise, which limits the sensitivity around 100Hz. In order to select good coating technology for cryogenic interferometers like KAGRA, we have been developing a coating thermal noise measurement system utilizing cryogenic optical cavities. Through the analysis of elastic deformation of the cavities by seismic vibrations, optimization of optical design and so on, we have designed the system. We then constructed a cryostat, optical cavities made of monocrystalline silicon, input optics system and so on.
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