论文标题

通过使用时间依赖性过滤器来补偿时间变化,提高了LIGO校准精度

Improving LIGO calibration accuracy by using time-dependent filters to compensate for temporal variations

论文作者

Wade, Madeline, Viets, Aaron D., Chmiel, Theresa, Stover, Madeline, Wade, Leslie

论文摘要

已知高级LIGO干涉仪的响应会随时间而变化[ARXIV:1608.05134]。因此,干涉仪的准确校准必须跟踪并补偿校准模型参数的时间变化。在前三个高级Ligo观察跑中跟踪了这些变化,其中一些的补偿已在校准过程中实现。在第二次观察过程中,对干涉仪响应的乘法校正在实时和高延迟中产生校准应变数据时应用。在第二次观测后以及在第三个观察过程的整个过程中产生的高延迟校准中,将涉及更新过滤器的校正应用于校准 - 耦合腔频率频率$ f _ {\ rm cc} $的时间依赖性。本文介绍了为补偿需要时间依赖过滤器的干涉仪响应的变化而开发的方法,包括可变零,电线杆,收益和时间延迟。所述方法用于为干涉仪响应的良好模块化时间依赖性提供补偿,这有助于将校准中的系统错误减少到$ <2 $%的幅度和$ <2^{\ circ} $中,这是Ligo在Ligo的20-2000 Hz中的阶段中的阶段,[arxiv:arxiv:2005.05531,21,210129]。此外,本文通过减少模拟二进制中子星合并的天空定位中的不确定性和偏差来显示这种补偿与天体物理推断研究的相关性。

The response of the Advanced LIGO interferometers is known to vary with time [arXiv:1608.05134]. Accurate calibration of the interferometers must therefore track and compensate for temporal variations in calibration model parameters. These variations were tracked during the first three Advanced LIGO observing runs, and compensation for some of them has been implemented in the calibration procedure. During the second observing run, multiplicative corrections to the interferometer response were applied while producing calibrated strain data both in real-time and in high-latency. In a high-latency calibration produced after the second observing run and during the entirety of the third observing run, a correction involving updating filters was applied to the calibration -- the time dependence of the coupled cavity pole frequency $f_{\rm cc}$. This paper describes the methods developed to compensate for variations in the interferometer response requiring time-dependent filters, including variable zeros, poles, gains, and time delays. The described methods were used to provide compensation for well-modeled time dependence of the interferometer response, which has helped to reduce systematic errors in the calibration to $<2$% in magnitude and $<2^{\circ}$ in phase across LIGO's most sensitive frequency band of 20 - 2000 Hz [arXiv:2005.02531, arXiv:2107.00129]. Additionally, this paper shows how such compensation is relevant for astrophysical inference studies by reducing uncertainty and bias in the sky localization for a simulated binary neutron star merger.

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