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

Document #:

LIGO-P1600063-v11

Document type:

P - Publications

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.

Files in Document:

• pdf (published version) (cqg_34_1_015002.pdf, 2.7 MB)

Other Files:

• pdf (author's compilation) (P1600063_tdep.pdf, 1.8 MB)

Topics:

• Calibration

Authors:

• Darkhan Tuyenbayev
• Sudarshan Karki
• Joseph Betzwieser
• Craig Cahillane
• Evan Goetz
• Kiwamu Izumi
• Shivaraj Kandhasamy
• Jeffrey Kissel
• Gregory Mendell
• Madeline Wade
• Alan Weinstein
• Richard Savage

Notes and Changes:

Tuyenbayev, D., et al. "Improving LIGO calibration accuracy by tracking and compensating for slow temporal variations." Classical and Quantum Gravity 34.1 (2016): 015002.

Published version (CQG)
DOI: https://doi.org/10.1088/0264-9381/34/1/015002

Related Documents:

• LIGO-T1500377: Tracking temporal variations in the DARM calibration parameters.

Referenced by:

• LIGO-E1500442: aLIGO, CAL, Publications