2020 Fiscal Year Final Research Report
Study on mechanical loss of bonding for improvement of a cryogenic payload of Large-scale Cryogenic Gravitational wave Telescope
| Project/Area Number |
19K14735
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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 | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Keywords | 低温工学 / 低温物性 / 重力波検出器 / 熱雑音 |
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| Outline of Final Research Achievements |
A goal of our research is that measuring mechanical loss of several bonding method for reducing thermal noise of a gravitational-wave detector, KAGRA, which located in Kamioke, Hida, Gifu, Japan. Thermal noise, which is caused by Brownian motion of atoms, is one of the fundamental noise sources for gravitational-wave detectors. The thermal noise can be reduced by making mechanical loss of the system smaller. So, in this research, Mechanical loss of the bonding sapphire samples that are bonded by using SUMISERAM and Gallium, which are used for the KAGRA sapphire suspension, for the first time.
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| Free Research Field |
重力波物理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は重力波検出器KAGRAの熱雑音低減を目指して、KAGRAで使用されている種々の接合手法による機械的散逸の測定を行った。これにって重力波検出器KAGRAの熱雑音が低減できれば、KAGRAが検出できる重力波イベントの数が増大し、宇宙物理学や天文学へのさらなる貢献が可能となる。
また、本研究で低減を目指す熱雑音は、重力波検出器に限らず、多くの超精密計測において原理的な測定限界を与えるものである。したがって、熱雑音の低減手法を模索する本研究は原子時計に代表される時間標準分野などへも波及効果のある研究となっている。
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