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Thermal modelling of Advanced LIGO test masses

Wang, Haoyu and Blair, Carl and Dovale Álvarez, M. and Brooks, A. and Kasprzack, M. F. and Ramette, J. and Meyers, P. M. and Kaufer, S. and O’Reilly, B. and Mow-Lowry, C. M. and Freise, A. (2017) Thermal modelling of Advanced LIGO test masses. Classical and Quantum Gravity, 34 (11). Art. No. 115001. ISSN 0264-9381. doi:10.1088/1361-6382/aa6e60.

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High-reflectivity fused silica mirrors are at the epicentre of today's advanced gravitational wave detectors. In these detectors, the mirrors interact with high power laser beams. As a result of finite absorption in the high reflectivity coatings the mirrors suffer from a variety of thermal effects that impact on the detectors' performance. We propose a model of the Advanced LIGO mirrors that introduces an empirical term to account for the radiative heat transfer between the mirror and its surroundings. The mechanical mode frequency is used as a probe for the overall temperature of the mirror. The thermal transient after power build-up in the optical cavities is used to refine and test the model. The model provides a coating absorption estimate of 1.5–2.0 ppm and estimates that 0.3 to 1.3 ppm of the circulating light is scattered onto the ring heater.

Item Type:Article
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URLURL TypeDescription Paper
Freise, A.0000-0001-6586-9901
Additional Information:© 2017 IOP Publishing Ltd. Received 9 December 2016, revised 14 April 2017. Accepted for publication 21 April 2017. Published 18 May 2017. This work is supported by the LSC fellows program and the Science and Technology Facilities Council (STFC). LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Grant No. PHY-0823459. The authors would like to thank Haixing Miao, Daniel Brown, and Anna Green for comments and suggestions. The authors also thank the LIGO Livingston Observatory staff for additional support.
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Science and Technology Facilities Council (STFC)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20170518-090451158
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77557
Deposited By: Ruth Sustaita
Deposited On:18 May 2017 21:09
Last Modified:12 Jul 2022 19:48

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