Thermal noise from icy mirrors in gravitational wave detectors

Steinlechner, J. and Martin, I. W. (2019) Thermal noise from icy mirrors in gravitational wave detectors. Physical Review Research, 1(1), 013008. (doi: 10.1103/PhysRevResearch.1.013008)

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The detection of gravitational waves has established a new and very exciting field of astronomy in the past few years. To increase the number of detections and allow observation of a wider range of sources, several future gravitational wave detectors will operate at cryogenic temperatures. Recent investigations of a mirror in one of the cryostats of the Japanese KAGRA detector showed a decrease in reflectivity due to ice growth, induced by residual water molecules moving from the warm to the cold sections of the detector's vacuum system. Based on the optical measurements made in KAGRA, in this paper we calculate the implications of an ice layer on coating thermal noise for the planned European Einstein Telescope. We find coating thermal noise to oscillate, due to periodic reflectivity changes as the ice layer grows. The average coating thermal noise increases significantly over a time of one year with a larger increase at higher temperatures.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Steinlechner, Dr Jessica and Martin, Dr Iain
Authors: Steinlechner, J., and Martin, I. W.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Research
Publisher:American Physical Society
ISSN (Online):2643-1564
Published Online:12 August 2019
Copyright Holders:Copyright © 2019 American Physical Society
First Published:First published in Physical Review Research 1(1): 013008
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
713723Investigations in gravitational radiationSheila RowanScience & Technology Facilities Council (STFC)ST/N005422/1S&E P&A - PHYSICS & ASTRONOMY