Calibration of the second-generation LIGO interferometric gravitational-wave detectors employs a method that uses injected periodic modulations to track and compensate for slow temporal variations in the differential length response of the instruments. These detectors utilize feedback control loops to maintain resonance conditions by suppressing differential arm length variations. We describe how the sensing and actuation functions of these servo loops are parameterized and how the slow variations in these parameters are quantified using the injected modulations. We report the results of applying this method to the LIGO detectors and show that it significantly reduces systematic errors in their calibrated outputs.
@article{arxiv.1608.05134,
title = {Improving LIGO calibration accuracy by tracking and compensating for slow temporal variations},
author = {D. Tuyenbayev and S. Karki and J. Betzwieser and C. Cahillane and E. Goetz and K. Izumi and S. Kandhasamy and J. S. Kissel and G. Mendell and M. Wade and A. J. Weinstein and R. L. Savage},
journal= {arXiv preprint arXiv:1608.05134},
year = {2016}
}
Comments
13 pages, 8 figures. This is an author-created, un-copyedited version of an article published in Classical and Quantum Gravity. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it