An advanced Real-Time Control System (RCS) for the precise feedback control of suspended optical devices and seismic isolation systems is currently under development at INFN Pisa. Building on previously presented hardware and system architecture, this contribution focuses on the intricate software layer, specifically on the **development of a new framework for flexible and...
The CAOS laboratory is one of the main infrastructures of the PNRR-ETIC project. This facility will house fifteen-meter vacuum towers for the new generation of superattenuators to test full-scale solutions for the Einstein Telescope. Particular attention was paid to air injection during payload installation and maintenance, with the design of the air inlets allowing the clean air flow to...
The Amaldi Research Center (ARC) at Sapienza University of Rome will host the first experimental implementation of a cooling system for a full-scale cryogenic payload cooled via solid conduction. The payload will be housed in a 3-meter-tall cryostat, which is scheduled for completion in 2025. To shield the payload from room temperature radiation, we will utilize the Rigid Multi-Layer (RML)...
At the ARC laboratory in Rome, a 1:1 scale cryogenic payload prototype is being developed to study conductive cooling methods. Sapphire has been chosen for the optics and suspension systems due to its excellent mechanical and thermal properties. In particular, at low temperatures (10-20 K), sapphire exhibits high thermal conductivity, which enables efficient heat extraction during cooling and...
The Einstein Telescope requires about 120 km of 1 m diameter vacuum tubes. The required pressure of less than 10$^{-11}$ mbar introduces the need for innovations that help with performance improvement and cost reduction.
The current basic concept of the vacuum system includes passive sections of stainless steel welded together inside the tunnels and connected to pumping stations.
Achieving...
The Laboratory of Architecture and Territory, whose members are all architects and researchers from the Department of Civil, Environmental Engineering and Architecture (DICAAR) of the University of Cagliari, Italy, explore the potential of designing research infrastructures and their spatial components by considering territorial systems. in recovering the material and immaterial value of a...
At the Einstein Telescope, gravity gradient 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.
We reformulate and implement the problem of finding the optimal seismometer positions in a differentiable way. We then explore the use of first-order...
One of the goals of the Einstein Telescope (ET) is to improve low-frequency sensitivity by moving the lower limit of observable frequencies from the current 10 Hz to 2 Hz. This target can be obtained with a Superattenuator (SA) that is 17 meters long, or alternatively, adopting a new design for the seismic filters that reduces the height of the SA. Inside the project “ **Black Holes for ET...
Future plans for ET-HF include operating at increasingly higher laser power to reduce shot noise, which in turn makes residual aberrations caused by thermal effects more significant, potentially becoming a limiting factor despite current correction methods. Since the early stages of the Virgo project, significant progress has been made in mitigating thermally-induced aberrations, which are...
Like electromagnetic waves, gravitational waves are lensed by massive objects between the source and the detector when they align. In geometric optics limit, this results in multiple signals separated in time that are magnified or de-magnified depending on the nature of lens mass distribution. On the otherhand, in the wave optics a single distorted signal is produced which affects the...
Dust particles present inside the Einstein Telescope vacuum pipes can be a possible source of scattered light. It is therefore important to accurately model the light-dust interaction mechanisms and the noise they can generate, so as to be able to put constraints on the maximum allowed population of particles in the vacuum pipes. It is also important to identify the processes/events that may...
At the Physics Dept. and INFN section of Ferrara, Italy, we have two working sensitive polarimeters dedicated to measuring the birefringence 2D map of substrate samples, 2D map of the static birefringence of reflective coatings and birefringence noise of high reflectivity mirror coatings. One will be dedicated to static birefringence measurements (substrates and reflective coatings) and the...
We have started a working group with ET and ET-Pathfinder members from UM, TNO, and KIT, planning to investigate the adsorption of gases on cryogenic mirror surfaces. Setups with a focus on two technologies are currently being persuit, ellipsometry and micro-balances. The use of micro-balances is currently restricted to room temperature or higher temperatures. We plan to test the applicability...
Gravitational-wave (GW) astronomy is an established field that is rapidly expanding with increasing detections from merging compact binary systems. The next generation of GW detectors promises a tenfold increase in sensitivity, leading to a thousandfold increase in the observable volume of the Universe and a corresponding rise in detection rates. This growing dataset provides a unique...
Improving the sensitivity at low-frequency range (1 - 10 Hz) of ground-based detectors requires compact interferometric sensors with high displacement sensitivity and dynamics for the readout of local test massess. We have combined Deep frequency modulation and compact interferometric techniques to develop a sensor for the same. A Strong sinusoidal laser frequency modulation (~3GHz modulation...