Abstract
Taiji space gravitational wave detection utilizes the laser interferometer to convert the tiny distance change into the phase fluctuation of the beat note. As to realize the sensitivity of 1 pm/√ Hz, the phasemeter needs to calculate the phase with the precision of 2πμ rad/√ Hz in the frequency range of 0.1 mHz and 1 Hz. In this paper, we report recent progress of the phasemeter for Taiji. Noises which possibly affect the measurement sensitivity are tested and discussed, especially the sampling noise and the frequency jitter. Finally, the accuracy of the phasemeter is calibrated. The result shows that the sensitivity has reached the requirement of Taiji in the frequencies between 0.01 Hz and 1 Hz, 0.1 mHz–1 mHz. Noises in the range of 1 mHz and 0.01 Hz, which have not yet depressed well, are dominated by the clocking jitter and the thermal fluctuation.
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This work was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB23030000).
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This article belongs to the Topical Collection: Approaching the Chinese Space Station - Microgravity Research in China
Guest Editors: Jian-Fu Zhao, Shuang-Feng Wang
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Liu, H., Luo, Z. & Jin, G. The Development of Phasemeter for Taiji Space Gravitational Wave Detection. Microgravity Sci. Technol. 30, 775–781 (2018). https://doi.org/10.1007/s12217-018-9625-6
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DOI: https://doi.org/10.1007/s12217-018-9625-6