LIGO Document P1600063-v10

Improving LIGO calibration accuracy by tracking and compensating for slow temporal variations

Document #:
LIGO-P1600063-v10
Document type:
P - Publications
Other Versions:
LIGO-P1600063-v11
21 Nov 2019, 17:05
LIGO-P1600063-v9
17 Aug 2016, 16:57
Abstract:
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.
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Notes and Changes:
CQR referee comments on initial submission and our response are attached to this version.

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