Sensitivity and performance of the Advanced LIGO detectors in the third observing run
Sensitivity and performance of the Advanced LIGO detectors in the third observing run
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DOI：
10.1103/physrevd.102.062003
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发表时间：
2020-09-11
影响因子：
5
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Buikema, A.;Cahillane, C.;Zweizig, J.
2019年4月1日，先进激光干涉仪引力波天文台（aLIGO）与先进处女座探测器一起开始了第三次观测运行，为期一年的引力辐射专门搜索。LIGO探测器已经实现了比以往更高的占空比和对引力波更高的灵敏度，LIGO Hanford对双星星星合并的角平均灵敏度达到111 Mpc，LIGO利文斯顿达到134 Mpc，占空比分别为74.6%和77.0%。灵敏度和稳定性的提高是由于对探测器进行了几次升级，包括腔内功率加倍，增加了用于挤压光注入的真空光学参量振荡器，更换了核心光学器件和末端反应质量，以及安装了声模阻尼器。本文探讨了这些升级背后的目的，并解释了我们所知的噪音目前限制每个探测器的灵敏度。
On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by the Advanced Virgo detector, began the third observing run, a year-long dedicated search for gravitational radiation. The LIGO detectors have achieved a higher duty cycle and greater sensitivity to gravitational waves than ever before, with LIGO Hanford achieving angle-averaged sensitivity to binary neutron star coalescences to a distance of 111 Mpc, and LIGO Livingston to 134 Mpc with duty factors of 74.6% and 77.0% respectively. The improvement in sensitivity and stability is a result of several upgrades to the detectors, including doubled intracavity power, the addition of an in-vacuum optical parametric oscillator for squeezed-light injection, replacement of core optics and end reaction masses, and installation of acoustic mode dampers. This paper explores the purposes behind these upgrades, and explains to the best of our knowledge the noise currently limiting the sensitivity of each detector.