Characterization of systematic error in Advanced LIGO calibration
Characterization of systematic error in Advanced LIGO calibration
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DOI：
10.1088/1361-6382/abb14e
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发表时间：
2020-05
影响因子：
3.5
通讯作者：
Ling Sun;E. Goetz;J. Kissel;J. Betzwieser;S. Karki;A. Viets;M. Wade;D. Bhattacharjee;V. Boss
中科院分区：
文献类型：
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作者：
Ling Sun;E. Goetz;J. Kissel;J. Betzwieser;S. Karki;A. Viets;M. Wade;D. Bhattacharjee;V. Boss
先进激光干涉仪引力波天文台内探测器的原始输出需要进行校准，以便产生用于天体物理分析的无量纲应变的估计。自第二次观测以来，两台探测器已完成升级，并完成了为期一年的第三次观测。理解、计算和/或补偿升级探测器的每个部分的复值响应提高了估计的探测器对引力波响应的整体精度。我们描述了用于量化每个探测器响应的改进理解和方法，并致力于定义系统误差发挥作用的所有地方。我们使用探测器在第三次观测运行的前半部分（六个月）中的状态来演示每个识别的系统误差如何影响估计的应变并限制其中的统计不确定性。在此时间段内，我们估计在最敏感的频段 20-2000 Hz 中，系统误差和相关不确定性的上限在幅度上 <7%，在相位上 <4 度（68% 置信区间）。单独的系统误差估计为幅度 <2% 和相位 <2 度的水平。
The raw outputs of the detectors within the Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order to produce the estimate of the dimensionless strain used for astrophysical analyses. The two detectors have been upgraded since the second observing run and finished the year-long third observing run. Understanding, accounting, and/or compensating for the complex-valued response of each part of the upgraded detectors improves the overall accuracy of the estimated detector response to gravitational waves. We describe improved understanding and methods used to quantify the response of each detector, with a dedicated effort to define all places where systematic error plays a role. We use the detectors as they stand in the first half (six months) of the third observing run to demonstrate how each identified systematic error impacts the estimated strain and constrain the statistical uncertainty therein. For this time period, we estimate the upper limit on systematic error and associated uncertainty to be <7% in magnitude and <4 deg in phase (68% confidence interval) in the most sensitive frequency band 20–2000 Hz. The systematic error alone is estimated at levels of <2% in magnitude and <2 deg in phase.