Thermal modelling of Advanced LIGO test masses

H. Wang; C. Blair; M. Dovale Álvarez; A. Brooks; M. F. Kasprzack; J. Ramette; P. M. Meyers; S. Kaufer; B. O'Reilly; C. M. Mow-Lowry; A. Freise

doi:10.1088/1361-6382/aa6e60

Thermal modelling of Advanced LIGO test masses

H. Wang, C. Blair, M. Dovale Álvarez, A. Brooks, M. F. Kasprzack, J. Ramette, P. M. Meyers, S. Kaufer, B. O'Reilly, C. M. Mow-Lowry, A. Freise

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

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.

Original language	English
Article number	115001
Journal	Classical and Quantum Gravity
Volume	34
Issue number	11
DOIs	https://doi.org/10.1088/1361-6382/aa6e60
Publication status	Published - 18 May 2017
Externally published	Yes

Funding

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.

Funders	Funder number
California Institute of Technology and Massachusetts Institute of Technology
National Science Foundation	PHY-0757058
Directorate for Mathematical and Physical Sciences	0757058, 0823459
Science and Technology Facilities Council

Keywords

coating absorption
gravitational wave detection
interferometry
mechanical mode
parametric instability
scattering loss
thermal modeling

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10.1088/1361-6382/aa6e60

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title = "Thermal modelling of Advanced LIGO test masses",

abstract = "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.",

keywords = "coating absorption, gravitational wave detection, interferometry, mechanical mode, parametric instability, scattering loss, thermal modeling",

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AU - Wang, H.

AU - Blair, C.

AU - Dovale Álvarez, M.

AU - Brooks, A.

AU - Kasprzack, M. F.

AU - Ramette, J.

AU - Meyers, P. M.

AU - Kaufer, S.

AU - O'Reilly, B.

AU - Mow-Lowry, C. M.

AU - Freise, A.

PY - 2017/5/18

Y1 - 2017/5/18

N2 - 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.

AB - 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.

KW - coating absorption

KW - gravitational wave detection

KW - interferometry

KW - mechanical mode

KW - parametric instability

KW - scattering loss

KW - thermal modeling

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ER -

Thermal modelling of Advanced LIGO test masses

Abstract

Funding

Keywords

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