Thermal Noise in Laser Interferometer Gravitational Wave Detectors

Flaminio, R.

doi:10.1007/978-3-319-03792-9_8

Cited by 2 publications

(3 citation statements)

References 37 publications

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“…Set the thermal expansion coefficient, density, Young's modulus, Poisson's ratio of the material [6,7,8], as shown in the following table 1.…”

Section: Materials Science and Engineeringmentioning

confidence: 99%

Research on Failure Mechanism and Thermal Stress of Thin-film Thermocouple at High Temperature

Wang

et al. 2022

KEM

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Aiming at the reliability of thin-film thermocouples applied to turbine blades at high temperatures, combined with high-temperature tests and finite element analysis, this paper studies its failure mechanism and thermal stress under thermal load. Multi-layer thin-film thermocouple samples were prepared on ceramic substrate, and high-temperature tests were carried out under different temperature loads, and the phenomenon of film shedding and cracking was observed using electron microscope. This paper analyzes the failure mechanism of the film sensor based on the function and structure, and uses ANSYS to analyze the thermal stress distribution of the film under high temperature load. Combining several existing theoretical models, this paper analyzes the factors affecting the thermal stress of the film and conducts simulation verification.

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“…Set the thermal expansion coefficient, density, Young's modulus, Poisson's ratio of the material [6,7,8], as shown in the following table 1.…”

Section: Materials Science and Engineeringmentioning

confidence: 99%

Research on Failure Mechanism and Thermal Stress of Thin-film Thermocouple at High Temperature

Wang

et al. 2022

KEM

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“…Reflective coatings on these test masses form the mirrors of Fabry-Perot cavities in the interferometer arms. It is expected that aLIGO and AdVirgo will eventually be limited in their sensitivity in the frequency range around 60 Hz, by the thermal noise associated with the mechanical loss of the reflective coatings on the test masses [4]. Future detectors are likely to operate well below room temperature to avoid this limitation.…”

Section: Introductionmentioning

confidence: 99%

“…The power of radiative cooling drops very quickly with temperature, as determined by the Stefan-Boltzmann law. A perfect black body at 300 K can radiate 450 W m −2 , whereas this has dropped to around 10 W m −2 at 120 K and 0.005 W m −2 at 10 K. We choose these temperatures as they are the intended operating temperatures for a proposed upgrade to the aLIGO interferometers [12], known as Voyager, and for the low frequency part of the Einstein telescope (ET LF) detector [4], a European proposal for a 3rd generation detector. Both these designs use silicon mirror substrates, cryogenically cooled, as test masses.…”

Section: Introductionmentioning

confidence: 99%

Anomalous optical surface absorption in nominally pure silicon samples at 1550 nm

Bell

Steinlechner

Martin

et al. 2017

Class. Quantum Grav.

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The announcement of the direct detection of gravitational waves (GW) by the LIGO and Virgo collaboration in February 2016 has removed any uncertainty around the possibility of GW astronomy. It has demonstrated that future detectors with sensitivities ten times greater than the Advanced LIGO detectors would see thousands of events per year. Many proposals for such future interferometric GW detectors assume the use of silicon test masses. Silicon has low mechanical loss at low temperatures, which leads to low displacement noise for a suspended interferometer mirror. In addition to the low mechanical loss, it is a requirement that the test masses have a low optical loss. Measurements at 1550 nm have indicated that material with a low enough bulk absorption is available; however there have been suggestions that this low absorption material has a surface absorption of >100 ppm which could preclude its use in future cryogenic detectors. We show in this paper that this surface loss is not intrinsic but is likely to be a result of particular polishing techniques and can be removed or avoided by the correct polishing procedure. This is an important step towards high gravitational wave detection rates in silicon based instruments.

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Thermal Noise in Laser Interferometer Gravitational Wave Detectors

Cited by 2 publications

References 37 publications

Research on Failure Mechanism and Thermal Stress of Thin-film Thermocouple at High Temperature

Research on Failure Mechanism and Thermal Stress of Thin-film Thermocouple at High Temperature

Anomalous optical surface absorption in nominally pure silicon samples at 1550 nm

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