Speaker
Description
For the Phase-2 upgrade of the ATLAS and CMS experiments, new generation 2PACL cooling systems will be installed for the thermal regulation of the inner tracking and timing detectors. A commissioning campaign is currently ongoing to validate operational readiness and characterize system performance.
The ATLAS system has been the focus of initial system verification and final development efforts. Accumulator stand-alone tests have been performed to validate the vessel design, and circulation of carbon dioxide at nominal conditions has helped validate the transferline configuration and overall plant performance. Improvements to the start-up procedure, control strategies and safety features have also been made, which is directly applicable to all future installations.
At CMS, commissioning efforts have successfully enabled circulation of carbon dioxide at low saturation temperatures through the experimental cavern. Besides putting multiple systems into service, this has also allowed validation of the transferline installation and manifold box design.
This contribution presents the status of the operational systems and the key challenges encountered during the commissioning process, as well as performance estimations of the detector, and the path forward to the start of LS3.