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View article: Mechanical simulation tool based on impedance matrices
Mechanical simulation tool based on impedance matrices Open
ctopus is a simulation software specifically developed to calculate the response of a given mechanical system. The initial purpose of its development was to support the design and the commissioning of the superattenuator (SA), i.e., the vi…
View article: Cryogenic Facility for Prototyping ET-LF Payloads Using Conductive Cooling
Cryogenic Facility for Prototyping ET-LF Payloads Using Conductive Cooling Open
Cooling down large test masses up to 200 kg, as foreseen for the Einstein Telescope, is a complex challenge combining cutting-edge technological achievements from different disciplines with the experience gained from both room-temperature …
View article: Ar transport and blister growth kinetics in titania-doped germania-based optical coatings
Ar transport and blister growth kinetics in titania-doped germania-based optical coatings Open
Blistering is a phenomenon sometimes observed in sputtered-deposited thin films but seldom investigated in detail. Here, we consider the case of titania-doped germania (TGO)/silica multilayers deposited by ion beam sputtering. TGO is a can…
View article: Cryogenic payloads for the Einstein Telescope: Baseline design with heat extraction, suspension thermal noise modeling, and sensitivity analyses
Cryogenic payloads for the Einstein Telescope: Baseline design with heat extraction, suspension thermal noise modeling, and sensitivity analyses Open
The Einstein Telescope (ET) is a third-generation gravitational wave detector that includes a room temperature high-frequency (ET-HF) and a cryogenic low-frequency laser interferometer (ET-LF). The cryogenic ET-LF is crucial for exploiting…
View article: ARC-ETCRYO and CAOS, two experimental facilities dedicated to Einstein Telescope cryogenics and suspensions
ARC-ETCRYO and CAOS, two experimental facilities dedicated to Einstein Telescope cryogenics and suspensions Open
The ETIC consortium will provide the R&D framework to investigate and validate possible configuration\nand solutions to be adopted for third generation gravitational-wave detector Einstein Telescope. The\ntwo facilities are dedicated to th…
View article: Cryogenic payloads for the Einstein Telescope -- Baseline design with heat extraction, suspension thermal noise modelling and sensitivity analyses
Cryogenic payloads for the Einstein Telescope -- Baseline design with heat extraction, suspension thermal noise modelling and sensitivity analyses Open
The Einstein Telescope (ET) is a third generation gravitational wave detector that includes a room-temperature high-frequency (ET-HF) and a cryogenic low-frequency laser interferometer (ET-LF). The cryogenic ET-LF is crucial for exploiting…
View article: Noise subtraction from KAGRA O3GK data using Independent Component Analysis
Noise subtraction from KAGRA O3GK data using Independent Component Analysis Open
During April 7–21 2020, KAGRA conducted its first scientific observation in conjunction with the GEO600 detector. The dominant noise sources during this run were found to be suspension control noise in the low-frequency range and acoustic …
View article: Argon and Other Defects in Amorphous SiO2 Coatings for Gravitational-Wave Detectors
Argon and Other Defects in Amorphous SiO2 Coatings for Gravitational-Wave Detectors Open
Amorphous SiO2 thin films are one of the two components of the highly reflective mirror coatings of gravitational-wave detectors. For this study, layers of amorphous SiO2 on crystalline Si substrates were produced by ion-beam sputtering (I…
View article: 3G R&D: R&D for the Next Generation of Ground-based Gravitational-wave\n Detectors
3G R&D: R&D for the Next Generation of Ground-based Gravitational-wave\n Detectors Open
To deliver on the promise of next generation gravitational-wave\nobservatories, a sustained and coordinated detector research and development\nprogram is required. This report examines in detail the wide range of nearer-\nand longer-term d…
View article: 3G R&D: R&D for the Next Generation of Ground-based Gravitational-wave Detectors
3G R&D: R&D for the Next Generation of Ground-based Gravitational-wave Detectors Open
To deliver on the promise of next generation gravitational-wave observatories, a sustained and coordinated detector research and development program is required. This report examines in detail the wide range of nearer- and longer-term dete…
View article: Seismic noise study in the underground Baksan Neutrino Observatory
Seismic noise study in the underground Baksan Neutrino Observatory Open
In this paper we report a study of the seismic noise measured in the underground Baksan Neutrino Observatory. The main spectral feature below 1 $Hz$ is the oceanic microseism, while for greater frequencies the measured horizontal and verti…
View article: Automated source of squeezed vacuum states driven by finite state machine based software
Automated source of squeezed vacuum states driven by finite state machine based software Open
In the last few decades, much effort has been made for the production of squeezed vacuum states in order to reduce quantum noise in the audio-frequency band. This technique has been implemented in all running gravitational-wave interferome…
View article: Measurement of geophysical effects on the large-scale gravitational-wave interferometer
Measurement of geophysical effects on the large-scale gravitational-wave interferometer Open
Geophysical application of large free-mass laser interferometers, which had been designed merely for the detection of gravitational radiation of an astrophysical nature, are considered. Despite the suspended mass-mirrors, these interferome…
View article: Small scale Suspended Interferometer for Ponderomotive Squeezing (SIPS) as test bench of the EPR squeezer for Advanced Virgo
Small scale Suspended Interferometer for Ponderomotive Squeezing (SIPS) as test bench of the EPR squeezer for Advanced Virgo Open
We are developing a small-scale interferometer with monolithic suspension of test masses (SIPS), that will be sensitive to the quantum radiation pressure noise in the audio frequency band of gravitational wave detectors. In the same time, …
View article: Electronic hardware and software development for the Advanced Virgo EPR squeezer
Electronic hardware and software development for the Advanced Virgo EPR squeezer Open
In this paper, we introduce the work on hardware and software built to manage the optical bench which hosts the optical squeezer source at the Virgo site in Cascina. In the past, the ex- perimental setup implemented frequency-independent s…
View article: Study and experiment on the alternative technique of frequency–dependent squeezing generation with EPR entanglement for Virgo
Study and experiment on the alternative technique of frequency–dependent squeezing generation with EPR entanglement for Virgo Open
In this paper, we summarize the present state-of-the-art on the proof-of-principle experiment of frequency-dependent squeezing implemented through EPR entanglement for Virgo gravitational-wave detector and we introduce Virgo subsystem prop…
View article: Characterization of the Sos Enattos site for the Einstein Telescope
Characterization of the Sos Enattos site for the Einstein Telescope Open
In this work we report the ongoing characterization of the Sos Enattos former mine (Sardinia, Italy), one of the two candidate sites for the Einstein Telescope (ET), the European third-generation underground interferometric detector of Gra…
View article: The status of KAGRA underground cryogenic gravitational wave telescope
The status of KAGRA underground cryogenic gravitational wave telescope Open
KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to reduce seismic noise, and the first km-class telescope to u…
View article: Magnetic coupling to the advanced Virgo payloads and its impact on the low frequency sensitivity
Magnetic coupling to the advanced Virgo payloads and its impact on the low frequency sensitivity Open
We study the electromagnetic coupling of the Advanced Virgo (AdV) input mirror payload in response to a slowly time-varying magnetic field. As the problem is not amenable to analytical solution, we employ and validate a finite element (FE)…
View article: Archimedes experiment: weighing the vacuum
Archimedes experiment: weighing the vacuum Open
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View article: Finite element analysis of the magnetic coupling to the Advanced Virgo payloads and its impact on the low frequency sensitivity
Finite element analysis of the magnetic coupling to the Advanced Virgo payloads and its impact on the low frequency sensitivity Open
We study the electro-magnetic feedback of the Advanced Virgo (AdV) Input Mirror Payload (IMP), in response to a slowly time-varying magnetic field. As the problem is not amenable to analytical solution, we employ and validate a finite elem…
View article: Weighing the vacuum with the Archimedes experiment
Weighing the vacuum with the Archimedes experiment Open
We present the status of the art of the Archimedes experiment, devoted to measure the weight of zero point energy by weighing the condensation energy of a layered type II superconductor. The experimental scheme of the Archimedes experiment…
View article: Construction of KAGRA: An underground gravitational-wave observatory
Construction of KAGRA: An underground gravitational-wave observatory Open
The major construction and initial-phase operation of a second-generation gravitational-wave detector, KAGRA, has been completed. The entire 3 km detector is installed underground in a mine in order to be isolated from background seismic v…
View article: Archimedes: A feasibility study of an experiment to weigh the electromagnetic vacuum
Archimedes: A feasibility study of an experiment to weigh the electromagnetic vacuum Open
Archimedes is a feasibility study of a future experiment to ascertain the interaction of vacuum fluctuations with gravity. The experiment should measure the force that the earth's gravitational field exerts on a Casimir cavity by using a s…
View article: Casimir energy for two and three superconducting coupled cavities: numerical calculations
Casimir energy for two and three superconducting coupled cavities: numerical calculations Open
In this paper we study the behavior of the Casimir energy of a multi-cavity across the transition from the metallic to the superconducting phase of the constituting plates. Our analysis is carried out in the framework of the ARCHIMEDES exp…