Conveners
Instrument Science (ISB): ISB - Contributed talks
- Stefan Hild
- Jan Harms
Instrument Science (ISB): ISB - Contributed talks
- Stefan Hild
- Jan Harms
Instrument Science (ISB): ISB + ETO
- Jan Harms
- Stefan Hild
- Benoît Tuybens (Nikhef)
Instrument Science (ISB): ISB - Contributed talks
- Jan Harms
- Stefan Hild
Instrument Science (ISB): ISB - business
- Jan Harms
- Stefan Hild
The CAOS international laboratory (Center for Gravitational Wave and Seismology Applications) of the University of Perugia, in collaboration with INFN and EGO and primarily funded by the ETIC (Einstein Telescope Infrastructure Consortium) project, is mainly designed to develop and test new technologies for the Einstein Telescope. The facility will focus on the development and fine-tuning of...
ETpathfinder is a R&D fieldlab aiming to provide a testbed for research, development, integration and validation of ET-LF technologies in an environment similar to ET. In particular the interferometer configuration featuring four cryogenic towers and two flexible bench towers (for input and output optics) allows for the construction of full Fabry-Perot Michelson interferometer, with a...
ETpathfinder is a testbed for interferometry at cryogenic temperatures. Following the design of ET-LF, ETpathfinder's arm cavities will consist of silicon mirrors at an operating temperature of around 18K. In our field, silicon is a new material for high-precision, low-loss optics, with many open questions on material properties and manufacturing capabilities. Here we will give an overview of...
In this presentation we will present an overview of the status of the squeezing subsystem from the squeezing source to its injection into the interferometer, including the filter cavities and the control strategy.
This presentation will be based on the work inside the squeezing working group, the task force and the preparation of the TDR. It will include discussion on R&D developments...
As straylight is an important limitation for the sensitivity of gravitational wave detectors, we investigate new laser operation concepts and interferometer topologies for a more straylight-resilient detector configuration.
Our focus is the use of tunable coherence realized by phase modulation following a pseudo-random-noise (PRN)-sequence on the interferometer laser. This breaks the...
In preparation for Einstein telescope, strategies to cool down the cryogenic payloads and cryotraps without introducing excess technical noise need to be developed and validated. A viable, ultra-low vibrational-noise strategy is to employ sorption coolers for low temperatures and sub-cooled liquid Nitrogen for intermediate temperatures. This technology is chosen in ETpathfinder. We will...
The Einstein Telescope (ET) will be the first third-generation gravitational wave observatory, requiring an underground vacuum system of unprecedented scale. The system will comprise more than 60 large unbaked chambers (“towers”), spanning ∼10^5 m² of surface area and a volume of ∼10^4 m³. Achieving and maintaining the required vacuum levels presents a unique challenge: ET must reach pressures...
Improved low-frequency sensitivity of gravitational wave observatories would unlock study of intermediate-mass black hole mergers and binary black hole eccentricity and provide early warnings for multimessenger observations of binary neutron star mergers. Today’s mirror stabilization control injects harmful noise, constituting a major obstacle to sensitivity improvements. We eliminated this...
We present a multi-scale optimal control framework for active seismic isolation in the Einstein Telescope, a third-generation gravitational-wave observatory. Our approach jointly optimizes feedback and blending filters in a cross-coupled opto-mechanical system using a unified cost function based on the "acausal optimum," which quantifies sensor signal-to-noise ratios across frequencies. This...
At the Einstein Telescope, Newtonian noise is expected to be the dominant noise for low frequencies. Its impact is proposed to be reduced with the help of an array of seismometers that will be placed around the interferometer endpoints. As boreholes for seismometers are expensive, their positions should be optimized. Up to now, this was done based on an analytical calculation that makes...
In Sos Enattos, the installation of the first double-arm suspended
balance with interferometric reading has been completed. The system
consists of a reference arm with a high moment of inertia and a
measurement arm, with low moment of inertia, suspending at one end a
lead sample and at the other end an aluminum sample. The aluminum sample is in turn. immersed in a thermal chamber to allow...
Crystalline materials play a key role in defining the design and the thermal and structural behavior of suspensions used for the test masses in upcoming gravitational wave interferometers that will employ cryogenic payloads. This talk will highlight the latest advancements from a collaborative research effort involving several laboratories, research centers, and private companies focused on...
We present the conceptual design of a six-degrees-of-freedom (6-D) active preisolator, building on the experience of the Virgo Superattenuator. The goal is to extend active control from the current three translational degrees of freedom to the full 6-D configuration, combining a mechanically optimized supporting structure with piezoelectric actuators and dedicated control strategies. The...
The Low Frequency interferometer of the Einstein Telescope will use cryogenic mirror suspensions with long pendulum providing horizontal attenuation to filter out the horizontal thermal noise generated by the seismic attenuation chain and by the heat links. They will be made of crystalline materials to minimize their own thermal noise generation.
It is almost impossible to make passive...
