E-TEST prototype design report

Sider, A.; Amez-Droz, L.; Amorosi, A.; Badaracco, F.; Baer, P.; Bruno, G.; Bertolini, A.; Collette, C.; Cebeci, P.; Fronzo, C. Di; Ebert, J.; Erben, B.; Esteves, R.; Ferreira, E.; Gatti, A.; Giesberts, M.; Hebbeker, T.; Hennig, J. S.; M., Hennig,; S., Hild,; M., Hoefer,; Hoffmann, H. D.; Jacques, L.; Jamshidi, R.; Joppe, R.; T., Kuhlbusch,; Lenaert, C.; Lakkis, M. H.; VAN, Bao Long LE; Loicq, J.; Locquet, J. P.; Loosen, P.; Nesladek, M.; Reiter, M.; Stahl, A.; Steinlechner, J.; Steinlechner, S.; Teloi, M.; Perez, J. Villaboa; Heijningen, J. V. van; Zeoli, Morgane

doi:10.48550/arxiv.2212.10083

Cited by 2 publications

(1 citation statement)

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“…The damping control loop AP is applied to AP in the local frame, then the isolation control loop AP is applied to the same stage but in the Cartesian frame, providing inertial isolation. More details on this control strategy will be published in a follow-up article whereas a brief description can be found in [45,46]…”

Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Sider

Fronzo

Amez-Droz

et al. 2023

Class. Quantum Grav.

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To achieve the expected level of sensitivity of third-generationgravitational-wave observatories, more accurate and sensitive instruments than those of the second generation must be used to reduce all sources of noise.Amongst them, one of the most relevant is seismic noise, which will require thedevelopment of a better isolation system, especially at low frequencies (below 10Hz), the operation of large cryogenic silicon mirrors, and the improvement ofoptical wavelength readouts. In this framework, this article presents the activitiesof the E-TEST (Einstein Telescope Euregio Meuse-Rhine Site & Technology) todevelop and test new key technologies for the next generation of GW observatories.A compact isolator system for a large silicon mirror at a low frequency is proposed. The design of the isolator allows the overall heightof the isolation system to be significantly compact and also suppresses seismicnoise at low frequencies. To minimize the effect of thermal noise, the isolationsystem is provided with a 100-kg silicon mirror which is suspended in a vacuumchamber at cryogenic temperature (25-40 K). To achieve this temperature withoutinducing vibrations to the mirror, a radiation-based cooling strategy is employed.In addition, cryogenic sensors and electronics are being developed as part of theE-TEST to detect vibrational motion in the penultimate cryogenic stage. Sincethe used silicon material is not transparent below the wavelengthstypically used for GW detectors, new optical components andlasers must be developed in the range above 1500 nm to reduce absorption andscattering losses. Therefore, solid-state and fiber lasers with a wavelength of 2090nm, matching high-efficiency photodiodes, and low-noise crystalline coatings arebeing developed. Accordingly, the key technologies provided by E-TEST servecrucially to reduce the limitations of the current generation of GW observatoriesand to determine the technical design for the next generation.

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Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Sider

Fronzo

Amez-Droz

et al. 2023

Class. Quantum Grav.

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Transverse mode control in quantum enhanced interferometers: a review and recommendations for a new generation

Goodwin-Jones,

Cabrita,

Korobko

et al. 2024

Optica

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Adaptive optics has made significant advancement over the past decade, becoming the essential technology in a wide variety of applications, particularly in the realm of quantum optics. One key area of impact is gravitational-wave detection, where quantum correlations are distributed over kilometer-long distances by beams with hundreds of kilowatts of optical power. Decades of development were required to develop robust and stable techniques to sense mismatches between the Gaussian beams and the resonators, all while maintaining the quantum correlations. Here we summarize the crucial advancements in transverse mode control required for gravitational-wave detection. As we look towards the advanced designs of future detectors, we highlight key challenges and offer recommendations for the design of these instruments. We conclude the review with a discussion of the broader application of adaptive optics in quantum technologies: communication, computation, imaging, and sensing.

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E-TEST prototype design report

Cited by 2 publications

References 0 publications

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Transverse mode control in quantum enhanced interferometers: a review and recommendations for a new generation

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