Speaker
Description
This contribution provides an update on the recent experimental activities and infrastructural developments at the Amaldi Research Center (ARC) in Rome, focused on the R&D for next-generation gravitational wave detectors.
We report on the systematic cooling tests and thermal characterization performed on the first cryostat cooling line. Following initial runs, a series of targeted upgrades were implemented to improve thermal shielding and minimize the impact of residual radiation, which is critical for reaching the target operating temperatures. The effectiveness of these thermal links and insulation strategies is evaluated through high-precision thermometry on both the pure aluminum bars and the Pulse Tube (PT) stages.
Furthermore, we present the assembly of a second cooling line. This setup utilizes a spring-loaded flange system instead of a traditional massive ground connection. Preliminary comparative vibration measurements between the two configurations are discussed, aiming to quantify the attenuation of PT-induced mechanical noise.
Future plans include the integration of the full cryostat assembly and the experimental study of cryogenic thermal joints using conical washers to optimize thermal conductance.