| Budget Amount *help |
¥42,640,000 (Direct Cost: ¥32,800,000、Indirect Cost: ¥9,840,000)
Fiscal Year 2021: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2018: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
Fiscal Year 2017: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
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| Outline of Final Research Achievements |
In this study, two PCALs (photon-pressure calibrator for gravitational wave signals) for KAGRA, which are higher performance versions of the LIGO PCAL, were developed through international collaboration with the United States and Taiwan, and gravitational wave signal calibration was performed at KAGRA. In addition, the co-PI in the University of Toyama developed a calibration system for absolute laser power, which is important for PCAL, and the PCAL laser power was calibrated periodically to improve the reliability of the calibrator accuracy. Using the developed PCALs, we performed signal calibration of KAGRA in O3GK, the first full-scale observation of KAGRA, and achieved a final signal calibration accuracy of 10%. This value includes the indeterminacy of the main interferometer transfer-function. After that, further noise reduction of PCALs wer performed, and the target accuracy of PCALs of less than 3% was achieved for the O4 observation.
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