Within the PNRR project "ETIC: Einstein Telescope Infrastructure Consortium", the University

of Perugia - Department of Physics and Geology, leads the design and implementation of the

CAOS laboratory (Center for Applications on Gravitational Waves and Seismology).

CAOS will be the infrastructure in which the suspensions will be studied and characterized, on a 1:1 scale.

mechanical for the main optics of the future European gravitational wave observatory, third

generation, called the Einstein Telescope (ET). The new ET interferometric detector

will increase the sensitivity and extend to low frequencies the observation band of the current

Advanced Virgo Plus (AdVPlus) and Advanced LIGO detectors. A similar project, called

Cosmic Explorer, is led by the LIGO Scientific Collaboration (LSC).

The object of this contract is the realization and supply of the following services:

• Design of the Suspension and the Installation Scaffolding in order to define in detail the

requirements of the system to be implemented.

• Construction, Assembly of Seismic Filters, Storage, Transport and Installation at CAOS

of N. 2 Suspensions (complete with electrical wiring and front-end electronics)

• Construction, Storage, Transport and Installation in CHAOS of N. 2 Scaffolding