Reduction of Thermal Fluctuations in a Cryogenic Laser Interferometric Gravitational Wave Detector

Uchiyama, Takashi; Miyoki, S.; Telada, S.; Yamamoto, K.; Agatsuma, K.; Arai, K.; Fujimoto, Masa–Katsu; Haruyama, T.; Kawamura, Seiji; Miyakawa, O.; Ohishi, N.; Saito, Takanori; Shintomi, T.; Suzuki, Toshikazu; Takahashi, Ryutaro; Tatsumi, Daisuke

doi:10.1103/physrevlett.108.141101

Cited by 39 publications

(22 citation statements)

References 28 publications

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“…• reducing the temperature of operation of mirrors [10]; the power spectral density of the noise of the coating is directly proportional to the temperature.…”

Section: A State Of the Art: A Concise Surveymentioning

confidence: 99%

The AdCoat project coatings for gravitational antennas of second and third generation

Canepa

2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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A relevant example where systems simultaneously capable of quasi ideal reflectivity and extremely low mechanical dissipation play a critical role, is provided by the test masses used in the gravitational waves detectors interferometers. Thermal noise generated by dissipation in the test-masses is the dominating factor in a frequency band, between 50 Hz and a few hundreds Hz, where a high relative sensitivity of the instrument meets a high astrophysical interest. The choice of interferential mirrors (e.g. λ 4 Ta2O5-SiO2 multilayers) negatively impacts on thermal noise as the mechanical losses in the coating are relatively large. Only a substantial reduction of the thermal noise of the mirrors will allow GWDs to reach and possibly exceed the limit represented by the quantum noise. This contribution aims at illustrating AdCoat a nation-wide research program recently launched by INFN, which attempts to gather all groups working in Italy on the reduction of thermal noise in coatings for gravitational antennas of second and third generation.

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“…• reducing the temperature of operation of mirrors [10]; the power spectral density of the noise of the coating is directly proportional to the temperature.…”

Section: A State Of the Art: A Concise Surveymentioning

confidence: 99%

The AdCoat project coatings for gravitational antennas of second and third generation

Canepa

2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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“…To treat the temperature dependence of these three parameters, we used fitted functions of measured values reported in Refs. [51][52][53]. The total mirror thermal noise will therefore be the sum of all the noises above for all four test masses:…”

Section: B Mirror Thermal Noisementioning

confidence: 99%

Particle swarm optimization of the sensitivity of a cryogenic gravitational wave detector

et al. 2018

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Cryogenic cooling of the test masses of interferometric gravitational wave detectors is a promising way to reduce thermal noise. However, cryogenic cooling limits the incident power to the test masses, which limits the freedom of shaping the quantum noise. Cryogenic cooling also requires short and thick suspension fibers to extract heat, which could result in the worsening of thermal noise. Therefore, careful tuning of multiple parameters is necessary in designing the sensitivity of cryogenic gravitational wave detectors. Here, we propose the use of particle swarm optimization to optimize the parameters of these detectors. We apply it for designing the sensitivity of the KAGRA detector, and show that binary neutron star inspiral range can be improved by 10%, just by retuning seven parameters of existing components. We also show that the sky localization of GW170817-like binaries can be further improved by a factor of 1.6 averaged across the sky. Our results show that particle swarm optimization is useful for designing future gravitational wave detectors with higher dimensionality in the parameter space.

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“…For macroscopic ultra-stable cavities, TRN has been observed to be a limitation on frequency stability at room temperature [284], and demonstrated to be suppressed at cryogenic temperatures [287]. For small mode-volume microcavities, TRN poses a much larger problem, and has been observed to limit frequency imprecision at the level of 10 3 Hz 2 /Hz at Fourier frequencies of about 1 MHz, at room temperature [277].…”

Section: Imprecision Due To Cavity Substrate Noisementioning

confidence: 99%

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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PAR Vivishek SUDHIR JOSEPH CONRAD, Heart of DarknessExperimental physics demands a certain degree of manual dexterity, the patience to tolerate the mundane, and an inexhaustible supply of optimism. Tobias hired me to work on an immensely sophisticated experiment despite any proof of my possessing these qualities; I am indebted to him for the belief he has placed in me. I would also like to acknowledge his dedication to fostering an environment where the pursuit of science is unencumbered by other worldly concerns. Stefan, Ewold and Samuel bore the brunt of a theorist trying to perform delicate experiments; the stern, yet encouraging, stewardship of this trio ensured that I enjoyed the culture shock. Dal Wilson was more than a colleague and a post-doc; his pragmatic approach to physics provided the ideal counter-point in our attempts to forge a deeper understanding of things ranging from vibration isolation to the subtleties of quantum mechanics. Without the patient efforts of Amir, Ryan and Hendrik in designing, fabricating, and testing of devices, none of the results reported here would have been possible. I hope I have been able to bequeath a better vision of the future of our experiment to Sergey. Conversations with Alexey, Daniel and Nathan have enabled me to vicariously learn how to measure microwave "photons". John Jost once taught me how to decorate a Christmas tree; since then he has imparted some wisdom on frequency metrology, and some on atomic physics. Together with Dal, Victor and Caroline have probably spent the most time with me outside the lab; it was fun to exercise an air of social normalcy with this bunch. Christophe has been an amazing sparring partner on every subject capable of being brought under scientific scrutiny.The personal space required for the pursuit of science comes through the sacrifice of many people. My family back home in India -parents, sister, grand-parents -have had to patiently wait for the brief interludes when I go home. No words can do justice to this and the very many other pleasures they have surrendered over the years for my sake. Before physics attracted me, I was charmed by someone else; I am lucky to have married her. Long time friends, mentorsAjith and Subeesh -have played pivotal roles in my being able to engage in physics; I hope to repay this enormous debt, some day.It was a privilege to have learnt from a few great teachers during my formative years. Their vision of an indelible unity in nature continues to motivate my study of physics. vii AbstractThe precision measurement of position has a long-standing tradition in physics. Cavendish's verification of the universal law of gravitation using a torsion pendulum, Perrin's confirmation of the atomic hypothesis via the precise measurement of the Brownian motion, and, the verification of the mechanical effect of electromagnetic radiation, all belong to this classical heritage. Quantum mechanics posits that the measurement of position results in an uncertain momentum; an idea developed to full maturity within the ...

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Reduction of Thermal Fluctuations in a Cryogenic Laser Interferometric Gravitational Wave Detector

Cited by 39 publications

References 28 publications

The AdCoat project coatings for gravitational antennas of second and third generation

The AdCoat project coatings for gravitational antennas of second and third generation

Particle swarm optimization of the sensitivity of a cryogenic gravitational wave detector

Quantum Limits on Measurement and Control of a Mechanical Oscillator

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