Regression of Suspension Violin Modes in KAGRA O3GK Data with Kalman Filters
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912634325958656 |
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| author | Moisset, Lucas Meyer-Conde, Marco Allene, Christopher Sakai, Yusuke Chen, Dan Kanda, Nobuyuki Takahashi, Hirotaka |
| author_facet | Moisset, Lucas Meyer-Conde, Marco Allene, Christopher Sakai, Yusuke Chen, Dan Kanda, Nobuyuki Takahashi, Hirotaka |
| contents | Suspension thermal modes in interferometric gravitational-wave detectors produce narrow, high-Q spectral lines that can contaminate gravitational searches and bias parameter estimation. In KAGRA, cryogenic mirrors are held by thick suspension fibers, designed to sustain such a low-temperature environment, which may further affect inharmonicity modes, fiber dimensions, and mechanical behavior compared to typical interferometers. As these modes remain a prominent source of narrowband contamination, we implement a Kalman filter to model and track violin lines, building on the methodology introduced in [1], and apply subtraction to KAGRA O3GK data. Using gravitational-wave template injections, we validate that the subtraction preserves matched-filter SNR while effectively suppressing line power. Comparisons of power spectral densities and residual analyses confirm that the method removes deterministic line contributions without introducing waveform distortions. This approach provides a cleaner strain channel for searches and parameter estimation and will become increasingly important for future low-temperature detectors with higher-Q suspensions, such as the Einstein Telescope. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20658 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Regression of Suspension Violin Modes in KAGRA O3GK Data with Kalman Filters Moisset, Lucas Meyer-Conde, Marco Allene, Christopher Sakai, Yusuke Chen, Dan Kanda, Nobuyuki Takahashi, Hirotaka General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors Suspension thermal modes in interferometric gravitational-wave detectors produce narrow, high-Q spectral lines that can contaminate gravitational searches and bias parameter estimation. In KAGRA, cryogenic mirrors are held by thick suspension fibers, designed to sustain such a low-temperature environment, which may further affect inharmonicity modes, fiber dimensions, and mechanical behavior compared to typical interferometers. As these modes remain a prominent source of narrowband contamination, we implement a Kalman filter to model and track violin lines, building on the methodology introduced in [1], and apply subtraction to KAGRA O3GK data. Using gravitational-wave template injections, we validate that the subtraction preserves matched-filter SNR while effectively suppressing line power. Comparisons of power spectral densities and residual analyses confirm that the method removes deterministic line contributions without introducing waveform distortions. This approach provides a cleaner strain channel for searches and parameter estimation and will become increasingly important for future low-temperature detectors with higher-Q suspensions, such as the Einstein Telescope. |
| title | Regression of Suspension Violin Modes in KAGRA O3GK Data with Kalman Filters |
| topic | General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2509.20658 |