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 › peer-review

5 Citations (Scopus)

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

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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",

author = "H. Wang and C. Blair and {Dovale {\'A}lvarez}, M. and A. Brooks and Kasprzack, {M. F.} and J. Ramette and Meyers, {P. M.} and S. Kaufer and B. O'Reilly and Mow-Lowry, {C. M.} and A. Freise",

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doi = "10.1088/1361-6382/aa6e60",

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T1 - Thermal modelling of Advanced LIGO test masses

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

UR - http://www.scopus.com/inward/record.url?scp=85019851070&partnerID=8YFLogxK

U2 - 10.1088/1361-6382/aa6e60

DO - 10.1088/1361-6382/aa6e60

M3 - Article

AN - SCOPUS:85019851070

VL - 34

JO - Classical and Quantum Gravity

JF - Classical and Quantum Gravity

SN - 0264-9381

IS - 11

M1 - 115001

ER -

Thermal modelling of Advanced LIGO test masses

Abstract

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