Characterization of the LIGO detectors during their sixth science run

Characterization of the LIGO detectors during their sixth science run

2015 | J. Aasi, M.-A. Bizouard, V. Brisson, F. Cavalier, M. Davier, S. Franco, P. Hello, N. Leroy, F. Robinet, T. Accadia, et al.
The paper "Characterization of the LIGO Detectors during their Sixth Science Run" by J. Aasi et al. reviews the performance and improvements made to the Laser Interferometer Gravitational-wave Observatory (LIGO) detectors during the sixth science run (S6) from July 2009 to October 2010. The study focuses on the characterization of the detectors, their data, and the impact of transient and continuous noise artifacts on the sensitivity to astrophysical sources. Key points include: - **Detector Configuration and Performance**: The detectors at LIGO Hanford Observatory (LHO) and LIGO Livingston Observatory (LLO) were upgraded with new systems to improve sensitivity and prototype upgrades for the second-generation Advanced LIGO (aLIGO) detectors. - **Sensitivity Improvements**: The duty factor, the fraction of the total run time during which science-quality data was recorded, increased significantly at both sites. The median duration of a single science-quality data segment more than doubled. - **Noise Sources and Mitigation**: Various noise sources, such as seismic noise, seismically-driven length-sensing glitches, upconversion of low-frequency noise due to the Barkhausen effect, beam jitter noise, and mechanical glitching, were identified and mitigated through hardware and control system improvements. - **Data Quality Veto Systems**: Data-quality vetoes were implemented to remove data likely to contain noise artifacts, improving the sensitivity of searches for transient and continuous gravitational waves. - **Searches for Gravitational Waves**: The performance of searches for transient signals (e.g., compact binary coalescences and GW bursts) and continuous signals (e.g., non-axisymmetric spinning neutron stars and a stochastic GW background) was measured, highlighting the impact of noise artifacts on the searched volume and time duration. The paper also discusses the evolution of the detector's sensitivity over the course of S6, showing significant improvements in both amplitude sensitivity and duty factor, which increased the searchable volume of the universe for astrophysical analyses.The paper "Characterization of the LIGO Detectors during their Sixth Science Run" by J. Aasi et al. reviews the performance and improvements made to the Laser Interferometer Gravitational-wave Observatory (LIGO) detectors during the sixth science run (S6) from July 2009 to October 2010. The study focuses on the characterization of the detectors, their data, and the impact of transient and continuous noise artifacts on the sensitivity to astrophysical sources. Key points include: - **Detector Configuration and Performance**: The detectors at LIGO Hanford Observatory (LHO) and LIGO Livingston Observatory (LLO) were upgraded with new systems to improve sensitivity and prototype upgrades for the second-generation Advanced LIGO (aLIGO) detectors. - **Sensitivity Improvements**: The duty factor, the fraction of the total run time during which science-quality data was recorded, increased significantly at both sites. The median duration of a single science-quality data segment more than doubled. - **Noise Sources and Mitigation**: Various noise sources, such as seismic noise, seismically-driven length-sensing glitches, upconversion of low-frequency noise due to the Barkhausen effect, beam jitter noise, and mechanical glitching, were identified and mitigated through hardware and control system improvements. - **Data Quality Veto Systems**: Data-quality vetoes were implemented to remove data likely to contain noise artifacts, improving the sensitivity of searches for transient and continuous gravitational waves. - **Searches for Gravitational Waves**: The performance of searches for transient signals (e.g., compact binary coalescences and GW bursts) and continuous signals (e.g., non-axisymmetric spinning neutron stars and a stochastic GW background) was measured, highlighting the impact of noise artifacts on the searched volume and time duration. The paper also discusses the evolution of the detector's sensitivity over the course of S6, showing significant improvements in both amplitude sensitivity and duty factor, which increased the searchable volume of the universe for astrophysical analyses.
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