ARC-ETCRYO and CAOS, two experimental facilities dedicated to Einstein Telescope cryogenics and suspensions

The ETIC consortium will provide the R&D framework to investigate and validate possible configuration and solutions to be adopted for third generation gravitational-wave detector Einstein Telescope. The two facilities are dedicated to the implementation needed for cryogenics application for the low- frequency interferometer (ET-LF) as well as those for the high-frequency interferometer (ET-HF), which are the concept components of Einstein Telescope detector.The main, in common to the two facilities, is the development of 1:1 scale payloads, investigating cryogenics versus test mass suspension, low- mechancial dissipation issues. While cryogenics will be the main objective of ARC facility in at Roma Sapienza University, the interferometric control of seismic isolated payloads at room temperature will be the topic of CAOS.